JM Roofing Systems Application Guide Book 3

JM PVC & TPO (Thermoplastic) Commercial Roofing Application Guide

Table of Contents

Section One Roof Insulation Application Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Roof Insulation Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Roof Insulation Fastening Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

Section Two Section 2A PVC Membrane Application Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Hybrid PVC Membrane with Redundant Bituminous Ply Systems Application Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34 PVC/TPO RhinoPlate System Application Guide . . . . . . . . . . . . . . . . . .2-46 Section 2B PVC General Product Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-50 PVC Fully Adhered Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-52 PVC Hybrid Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-56 PVC Mechanically Fastened Specifications . . . . . . . . . . . . . . . . . . . . 2-72 PVC RhinoPlate Systems Specifications . . . . . . . . . . . . . . . . . . . . . . . . 2-76

Section 2C PVC Mechanically Fastened Fastening Patterns . . . . . . . . . . . . . . . . .2-80

Section 2D PVC Flashing Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-89 Vapor Barrier Flashing Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-181

Section Three Section 3A TPO Membrane Application Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 PVC/TPO RhinoPlate System Application Guide . . . . . . . . . . . . . . . . . .3-33

Section 3B TPO General Product Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-36 TPO Fully Adhered Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-38 TPO Mechanically Fastened Specifications . . . . . . . . . . . . . . . . . . . . 3-74 TPO RhinoPlate Systems Specifications . . . . . . . . . . . . . . . . . . . . . . . . 3-98

Section 3C TPO Mechanically Fastened Fastening Patterns . . . . . . . . . . . . . . . .3-102

Section 3D TPO Flashing Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-113 Vapor Barrier Flashing Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-207

717 17th StreetDenver, CO 80202(800) 922-5922www.jm.com/roong

MechanicallyFastened

Fully Adhered Hot Air Weld MechanicallyFastened

Fully Adhered Hot Air Weld

Book 3: PVC and TPO

Book 3: PVC and TPO

Book 3: PVC and TPO

RS-8350-PVC/TPO 5-15 (Replaces 3-14)

COMMERCIAL ROOFING APPLICATION GUIDE

RS-8350-PVC-TPO

Section One:Roof Insulation Application

Roof Insulation Application

ONESECTION1Roof Insulation

Application Guide, Specifications, and Fastening Patterns

1-1RS-7386 11-13 (Replaces 2-13)

Roof Insulations Application

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1.0 Product Information

Effective roof insulation helps lower overall energy consumption, reduces HVAC equipment requirements, and brings about improved comfort for the occupants of a building .

JM provides these benefits with a full line of high performance insulations and cover for single ply, built-up, metal and modified bitumen roofs . The section that follows reviews the storage, installation and use instructions for the cover board and insulation board product lines . JM product line . Prior to product selection, it is recommended that the product performance, design and installation concepts of the roofing system be considered to ensure the correct product selection .

The Fesco product line incorporates recycled cellulose and has been third-party certified for recycled content by UL Environment . With an average recycled content of 27% to 40%, this product line can provide LEED points (certified products) in certain jobs . The JM polyisocyanurate product line has product comprised of a closed-cell polyisocyanurate foam core bonded in the manufacturing process to various facers (glass-reinforced, paper, coated glass and aluminum foil) . Finally, the Invinsa product line includes high-density polyisocyanurate cover boards that are lightweight with high compressive strength . These boards provide improved hail resistance and foot traffic resistance .

2.0 Guarantees

It is also important to protect a roofing system with a guarantee of performance . JM offers a wide variety of Peak Advantage Guarantees, including many 20-year No-Dollar-Limit (NDL) specifications which are available from NDL Approved Contractors only . Check with a JM Technical Services Specialist for the names of approved NDL Contractors in your area and details on NDL guarantees including extended term guarantees .

3.0 Product Considerations

3.1 Insulation Characteristics Roof insulation performs two basic functions in any roof system . It is the primary thermal barrier for the top surface of the building envelope, and it serves as a base for the roofing system . In order to perform these two functions successfully, any roof insulation should have the following characteristics: Sufficient thermal resistance (R Value) to meet the designers needs . Resistance to indentation, compression and crushing during installation of the roof

membrane and during periodic maintenance, once the roof is completed . Cover boards are always recommended by JM .

Rigidity to support the roof membrane and to span the rib openings of metal roof decks . Resistance to moisture absorption . Dimensional stability . Compatibility with common roofing systems and attachment techniques . Resistance to wind uplift, and pull-through of mechanical fasteners . Acceptability by Underwriters Laboratories Inc ., FM Global and code agencies .

4.0 Design Considerations

4.1 Drainage Proper drainage must be provided on all roof systems . Standing or ponded water hastens the deterioration of any roof system since the water can work its way through laps or any minor application flaw in the membrane .

4.2 Double Insulation Layers Installing roof insulation in multiple layers provides the designer with improved thermal performance . It also contributes to the overall perfor-mance of the roof system for the following reasons: Recent studies indicate that as much as 8% of the thermal efficiency of the insulation

can be lost through the insulation joints and exposed insulation fasteners of single layer installations . Insulation joints that are staggered in multiple layer installations block the flow of heat .

Roof InsulationApplication Guide

1Roof InsulationApplication Guide, Specifications, and Fastening Patterns

Section One:Roof Insulation Application

1-2 1-3RS-7386 11-13 (Replaces 2-13) RS-7386 11-13 (Replaces 2-13)

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6.0 Foam Thermal Values6.1 Thermal Values The thermal values of all closed cell urethane or isocyanurate foam insulations are at their optimum at the time of manufacture . As these products age, some thermal loss occurs due to air infiltrating the foam cells and diluting the insulating gas in the cells . This process continues to occur over time . The degree to which this occurs is a function of the product formula and quality . It may vary from one manufacturer to another . The ultimate R-value of foam products will also depend on individual installation circumstances .

6.2 Long Term Thermal Resistance (LTTR) Johns Manville manufactures polyisocyanurate foam insulation products and reports R-Value in accordance with ASTM C 1289-12 and CAN/ULC S704 . LTTR is a test procedure for a foam insulation with blowing agents other than air, giving a Thermal Resistance value in a 15 year time-weighted average . This method provides a more accurate method to report long term thermal performance for foam plastic insulation materials .

7.0 Definition of Terms and Symbols7.1 k-Value (Thermal Conductivity): the measurement of heat flow in BTUs through a 1 (25 mm) thickness of any single homogeneous material, per hour per sq . ft . per degree F temperature difference (W/m C) .

7.2 C-Value (Thermal Conductance): the measurement of heat flow in BTUs per hour per sq . ft . per degree F temperature difference through any single material, regardless of thickness (W/m2 C) .

7.3 R-Value (Thermal Resistance): the measurement of the resistance to heat flow . The reciprocal of the C-value .

7.4 U-Value (Overall Heat Transfer Coefficient): the measurement, in BTUs of heat flow, per hour per sq . ft . per degree F temperature difference through a combination of materials such as roof deck, vapor barrier, roof insulation, built-up roofing, and the air films below and above such combinations .



Multiple layer insulation installation reduces the stress accumulation of a thick, single insulation joint and distributes the stress more evenly over the multiple, thinner insulation joints .

The bottom side of the membrane is protected from physical damage from insulation plates and fasteners by the second layer of insulation .

Roof decks are stiffened .

5.0 Insulation Installation Considerations

5.1 Protection from Weather JM Roof Insulations (polyiso, Invinsa, and Fesco) are shipped with plastic shrouds that are intended to temporarily protect the insulation while in transit . Polyiso packaging from some JM plants is considered tarpless; meaning it can be shipped without covering the load with a tarpaulin . JM plants without tarpless packaging ship polyiso with loads covered by a tarpaulin . Please contact your technical representative to learn which JM factories use tarpless packaging .

All JM insulation products (no matter how shipped), that are stored outdoors, must be stored in accordance with Johns Manville, NRCA (National Roofing Contractors Association) and PIMA (Polyisocyanurate Insulation Manufacturing Association) best roofing practices using a weatherproof covering such as a tarpaulin . In humid climates, JM recommends slitting the plastic shrink wrap (or removing the packaging all together), prior to covering the pallet with a breathable tarpaulin, to allow for venting . Furthermore, JM insulation should not be stored in or around standing water . JM recommends 3 to 4 of dunnage below individual pallets of insulation to keep it off the ground .

Insulation should not be left exposed to weather . No more insulation should be installed than can be completely covered with membrane on the same day . Factory packaging should not be relied upon as protection from the weather .

5.2 Asphalt Temperatures JM endorses the guidelines established by the NRCA and ARMA for heating asphalt for proper insulation applications . Asphalt should be applied at the Equiviscous Temperature (EVT), 25F (14C) .

5.3 Cold Weather Application Hot asphalt chills rapidly at 40F (4C) . To avoid problems associated with cold asphalt application, insulation should be applied with mechanical fasteners or the mop and flop method of installing insulation . The mop and flop method entails mopping the back of the insulation so that the asphalt retains its adhesive qualities for a longer period . When applying insulation with hot asphalt, board size should not exceed 4 x 4 (1 .22 m x 1 .22 m) . Care should be taken in any application below 40F (4C) .

5.4 Mechanical Application to Steel Decks Mechanical attachment of insulation to steel decks is the only acceptable attachment method . For current information regarding Factory Mutual requirements over insulated steel decks, please check with a JM Technical Services Specialist, or the current FM ApprovalsSM RoofNav .

5.5 Cold Adhesive Application JM insulations may be installed in Insulation Adhesives: MBR Bonding Adhesive One-Step Foamable Adhesive Roofing Systems Urethane Adhesive

5.6 Foam Insulation Products are Combustible They should be properly protected from exposure to fire during storage, transit and application .

5.7 Limitations When installed over metal decks, spans shall be limited for specific deck gauges as outlined in the current FM Global Loss Prevention Data Sheets 1-28, 1-29 and FM ApprovalsSM RoofNav . JM insulations are not recommended for applications where temperatures are outside the service temperatures of -100F to 250F (-73C to 121C) . Although JM roof insulations are designed to be compatible with most membranes, the membrane manufacturer should be consulted for specific approval with individual membrane products .

1-4 1-5RS-7387 11-13 (Replaces 11-12)RS-7387 11-13 (Replaces 11-12)

Type of Deck Attachment Recommendation

Wood Board 1, 2, 7*

Plywood 1, 2, 7*

Gypsum 3, 5*

Gypsum 3*

Concrete 4, 6

Concrete 6

Concrete 5*

Cementitious Wood Fiber 3

Steel 1, 2

* See mechanical fastener recommendation Section 1 .5, Roof Decks in the current Commercial Roofing Product Manual .

UltraFast metal plates should not be used on SPM systems .

UltraFastFastener and Metal Plate

Roof Insulation

Steel Roof Deck

1

UltraFastFastener and Plastic Plate

Roof Insulation

Steel Roof Deck

2

Polymer Auger Fastener with Plate

Roof Insulation

Cementitious Wood Fiber or Gypsum Roof Deck

3

Note: See pages 3-9 through 3-17 for Roof Insulation Board Fastening Placement Patterns .

Roof Insulation SpecificationsRecommendations for AttachingInsulation to a Structural Deck

Insulation SpecificationsThe JM Insulation Specification numbering system is designed to allow the designer to easily and clearly describe a particular insulation construction . Arabic numerals denote the number of layers of insulation attached in a particular manner . Capital letters indicate the method of attachment of the insulation and the presence of a vapor retarder .

Capital letters indicate the following:M = Mechanically Fastened V = Vapor RetarderA = Adhered (Hot Asphalt) C = Cold AdhesiveL = Loose Laid (Cold Applied & Urethane Adhesive)


UrethaneAdhesive

Hot Asphalt Cold Applied

ExamplesA construction of one layer of insulation mechanically fastened to a structural deck with a vapor retarder and a second layer of insulation mopped in hot asphalt would be described as 1MV1A .

Two layers of insulation mopped in hot asphalt to a structural deck would be described as 2A .

One layer of insulation loose laid on a structural deck would be described as 1L .

Deck Substrate: S = Steel C = ConcreteW = Wood G = GypsumL = Lightweight Concrete T = Cementitious Wood Fiber

Insulation Specification

InsulationBottom LayerAttachment

InsulationTop LayerAttachment Deck Substrate

1MV1A Mech . Fastened Adhered S, W, L, C, G, T

1M1A Mech . Fastened Adhered S, W, L, C, G, T

1M1C Mech . Fastened Cold Adhesive S, W, L, C, G, T

1A Adhered L*, W*, C, G*, T*

2A Adhered Adhered L*, W*, C, G*, T*

1C Cold Adhesive L*, W*, C, G*, T*

1L Loose Laid S, W, L, C, G, T

1L1M Loose Laid Mech . Fastened S, W, L, C, G, T

1M Mech . Fastened S, W, L, C, G, T

1 MV2A Mech . Fastened Adhered S

V1A Adhered W**, L**, C, G**, T**

V2A Adhered Adhered W**, L**, C, G**, T**

* Insulation must be fully adhered to nailed base sheet .** Vapor barrier must be adhered to nailed base sheet .

Roof Insulation Specifications

1MV1A1 Layer AdheredMechanically

Fastened VaporRetarder1 Layer


UrethaneAdhesive



UrethaneAdhesive



UrethaneAdhesive


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Roof Insulations Specifications


AdheredFirmly set the units of approved JM roof insulation, long joints continuous and short joints staggered, into a full width mopping of hot asphalt (within 25F [14C] of the EVT) . The asphalt should be applied at a nominal rate

of 30 lb/100 ft2 (1 .46 kg/m2) . Porous substrates may require greater amounts of asphalt . Concrete decks must be primed with Asphalt Primer prior to the application of hot asphalt . Concrete deck release moisture while curing . When adhering insulation with hot asphalt, board size must be no greater than 4 x 4 (1 .22 m x 1 .22 m) . If insulation is being installed over an existing layer of insulation or in multiple layers, all joints must be offset a minimum of 6 (152 mm) between layers . Insulation may not be adhered directly to wood, steel, gypsum, structural wood fiber or lightweight insulating concrete decks . If insulation is adhered over nailed base sheet, the nailing pattern shall be as shown below .

Apply only as much insulation as can be covered by a complete roof membrane in the same day . Do not leave insulation exposed to the weather .

When nailing a base sheet to a nailable deck, JM requires the fastening pattern illustrated below:

The side laps are secured 9 (229 mm) on center, and the center of the sheet is secured with two staggered rows of fasteners 11 (279 mm) apart, fastened 18 (457 mm) on center .

Roof Insulation SpecificationsRecommendations for Attaching

Insulation to a Structural Deck

Roof Insulation SpecificationsSpecification 1A One Layer Asphalt Attached

Note: See pages 1-12 through 1-18 for Roof Insulation Board Fastening Placement Patterns .

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..

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. ..

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. ..

...

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StructuralConcrete DeckFastener

RoofInsulation

StructuralConcrete Roof Deck

4

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.. . StructuralConcrete Roof Deck

RoofInsulation

Asphalt orCold Adhesive

Asphalt Primer

6

RoofInsulation


Wood or Plywood PlywoodRoof Deck

Base Sheet

Roofing Nail (Minimum 1" Head or Cap)Fastening pattern as shown on page ___.

7

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RoofInsulation

LightweightConcrete RoofDeck

Base Sheet

Pre-Assembled Fastener and PlateFastening pattern as shown on page ___.

5

11"

11"

11"18"

9"

Specification 1A

Asphalt PrimerWhere Required

Asphalt

Concrete Deck or Nailed Base Sheet


UrethaneAdhesive



UrethaneAdhesive



UrethaneAdhesive



UrethaneAdhesive



UrethaneAdhesive



UrethaneAdhesive



UrethaneAdhesive



UrethaneAdhesive


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Mechanically FastenedApply the units of approved JM roof insulation with long joints continuous . End joints should be staggered so that they are offset at least 12 (305 mm) from the end joints in adjacent rows . If insulation is being installed over an

existing layer of insulation, all joints in the insulation layers must be offset a minimum of 6 (152 mm) between layers . Insulation boards should be tightly butted with adjacent boards . Insulation joints greater than (13 mm) should be properly filled to receive the subsequent layers of the roofing system . Use an approved mechanical fastener of sufficient length to penetrate through or into the deck as required by the specific fastener . Fasteners should be placed in the pattern for the approval desired but never closer than 6 (152 mm) from either edge of the insulation board . On steel decks, the edges of the insulation board that run parallel to the deck rib must be solidly supported by the ribs . Fasteners are to be driven through the appropriate insulation plates . Care should be taken not to overdrive or underdrive the fastener . Overdriving the fastener will cause the insulation plate to cup and can result in inadequate performance and damage to the membrane . Underdriving can cause the insulation to be loose from the deck and allow the fastener to penetrate into the membrane .


Roof Insulation SpecificationsSpecification 1MOne Layer Mechanically Fastened

Loose LaidInsulation units may be loose laid with no means of attachment to the structural deck in SPM Specification SE4B . It is highly recommended that over steel decks, some means of mechanical fastening be used . Install

insulation units with long joints continuous . End joints should be staggered so that they are offset at least 12 (305 mm) from the end joints in adjacent rows . The units of insulation should fit snugly to adjoining units . If insulation is being installed over an existing layer of insulation or in multiple layers, all joints must be offset a minimum of 6 (152 mm) between layers . The existing layers must be dry . Apply only as much insulation as can be covered by a complete roof membrane in the same day . Do not leave insulation exposed to the weather .

Any ApprovedDeck

Specification 1L

Cold AdhesiveFirmly set the top layer of approved JM roof insulation, long joints contin-uous and short joints staggered, into JM MBR Cold Application Adhesive . The adhesive should be applied at a nominal rate of 2 to 3 gal/100 ft2 (1 .02 to 1 .22 l/m2), with a minimum application rate of 2 gal/100 ft2 (0 .82 l/m2) . If applied to porous materials, the application rate will increase, depending on the absorbency of the material . Concrete decks must be primed with Asphalt Primer prior to the application of hot asphalt . If insulation is being

installed over an existing layer of insulation or in multiple layers, all joints must be offset a minimum of 6 (152 mm) between layers . Insulation may not be adhered directly to wood, steel, gypsum, structural wood fiber or lightweight insulating concrete decks . If insulation is adhered over nailed base sheet, the nailing pattern shall be as shown in Specification 1A . Apply only as much insulation as can be covered by a complete roof membrane in the same day . Do not leave insulation exposed to the weather .

Specification 1C

Asphalt Primer

MBR Cold ApplicationAdhesive

Concrete Deck or Nailed Base Sheet

Roof Insulation SpecificationsSpecification 1L

One Layer Loose LaidSpecification 1C

One Layer Cold Adhesive Attached

Steel Plywood

Wood

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Concrete

Correct Screw must be seated to pull plate snug and flush

18-22 gauge steel deck

Point is " (19 mm) minimum thru deck

Incorrect Screw not properly seated, may puncture membrane

Screw must not be overdriven, causing plate to cup


UrethaneAdhesive



UrethaneAdhesive



UrethaneAdhesive



UrethaneAdhesive


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Mechanically FastenedApply the bottom layer of approved JM roof insulation with long joints continuous . End joints should be staggered so they are offset at least 12 (305 mm) from the end joints in adjacent rows . Use an approved mechanical

fastener of sufficient length to penetrate through or into the deck as required by the specific fastener . Fasteners should be placed in the pattern for the approval desired but never closer than 6 (152 mm) from either edge of the insulation board . On steel decks, the edges of the insulation board that run parallel to the deck rib must be solidly supported by the ribs . Fasteners are to be driven through the appropriate insulation plates . Care should be taken not to overdrive or underdrive the fastener . Overdriving the fastener will cause the insulation plate to cup and can result in inadequate performance . Underdriving can cause the insulation to be loose from the deck .

Firmly set the top layer of approved JM roof insulation, long joints continuous and short joints staggered, into a full width of mopping of hot asphalt (within 25F [14C] of the EVT) . The bitumen should be applied at a nominal rate of 30 Ib/100 ft2 (1 .46 kg/m2) . All joints must be offset a minimum of 6 (152 mm) between top and bottom layers of insulation .


See Specification 1M for proper fastening of insulation into other deck substrates .

Roof Insulation SpecificationsSpecification 1M1A Two Layers Mechanically Fastened/Asphalt Attached

Mechanically FastenedApply the bottom layer of approved JM roof insulation with long joints continuous . End joints should be staggered so they are offset at least 12 (305 mm) from the end joints in adjacent rows . Use an approved mechanical

fastener of sufficient length to penetrate through or into the deck as required by the specific fastener . Fasteners should be placed in the pattern for the approval desired but never closer than 6 (152 mm) from either edge of the insulation board . On steel decks, the edges of the insulation board that run parallel to the deck rib must be solidly supported by the ribs . Fasteners are to be driven through the appropriate insulation plates . Care should be taken not to overdrive or underdrive the fastener . Overdriving the fastener will cause the insulation plate to cup and can result in inadequate performance . Underdriving can cause the insulation to be loose from the deck .

Firmly set the top layer of approved JM roof insulation, long joints continuous and short joints staggered, into JM MBR Cold Application Adhesive . The adhesive should be applied at a nominal rate of 2 to 3 gal/100 ft2 (1 .02 to 1 .22 l/m2), with a minimum application rate of 2 gal/100 ft2 (0 .82 l/m2) . If applied to porous materials, the application rate will increase, depending on the absorbency of the material . All joints must be offset a minimum of 6 (152 mm) between top and bottom layers of insulation .


See Specification 1M for proper fastening of insulation into other deck substrates .

Roof Insulation SpecificationsSpecification 1M1C

Two Layers Mechanically Fastened/Cold Adhesive Attached

MBR Cold ApplicationAdhesive

Specification 1M1C

Steel Deck

Asphalt

Specification 1M1A

Steel Deck


UrethaneAdhesive

Hot Asphalt Cold Applied MechanicallyFastened

UrethaneAdhesive


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Roof InsulationsFastener Placement4 x 4 (1.22 m x 1.22 m) Boards

Roof InsulationsFastener Placement

2 x 4 (0.61 m x 1.22 m) Boards

6 Fasts. / Bd.

6"6" (Typ.)

24"

4 Fasts. / Bd.

12" (Typ.)

6" (Typ.)

2 Fasts. / Bd.

12" (Typ.)

7 Fasts. / Bd.

6"

6" (Typ.)24"

12"

5 Fasts. / Bd.

6" (Typ.)

6" (Typ.)

12"

24"

24"

3 Fasts. / Bd. - Staggered

6" (Typ.)

12" (Typ.)

6" (Typ.)

12"

"21 "21 "21

8 Fasts. / Bd.

6" (Typ.)

9 Fasts. / Bd.

6"

6"6"6"

12 Fasts. / Bd.

6"6" 6"

6"12"

12"

12"

6 Fasts. / Bd.

24"6"

6"

12"

12"

5 Fasts. / Bd.

6"6"

4 Fasts. / Bd.

12"(Typ.)

24"12"12"

6"

6"

6"6"

12"

12"

12"

11 Fasts. / Bd.

18" 18"

24"6"

6"

12"

12"

7 Fasts. / Bd.

8 Fasts. / Bd.

6"12"

12"

6"24"

24"

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4 x 4 (1.22 m x 1.22 m) Boards

14 Fasts. / Bd.

6"6" 6"

6"

12"

12" 12" 12"

24"

12"

12"

6"6" 6"

6"

12"

12" 12" 12"

12"

12"

24"

18 Fasts. / Bd.

6" 6"12" 12" 12"

24"6"

6"

9"9"9"9"

22 Fasts. / Bd.

6"6" 6"

6"

12"

12" 12" 12"

12"

12"

16 Fasts. / Bd.

24"6"

6" 6"

6"

12"

12" 12" 12"

12"

12"

17 Fasts. / Bd.

6"

6"

6" 6"12" 12" 12"

24"9"9"9"9"

20 Fasts. / Bd.

6 Fasts. / Bd.

36"

6"

12" 12"

8 Fasts. / Bd.

6"

12" 12"3 Spaces @ 24"

36"

6"

12" 12"

10 Fasts. / Bd.

3 Spaces @ 24"

36"

24"

6"

12"12"

9 Fasts. / Bd.

48"

24"

6"

11 Fasts. / Bd.

48" 36"

24"

12"12"

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4 x 8 (1.22 m x 2.44 m) Boards

12" 12"3 Spaces @ 24"

6"

6"

36"

24"

12 Fasts. / Bd.

18"

18"

36"48"

24"6"

6"12"12"

18"

18"

14 Fasts. / Bd.

3 Spaces @ 24"

6"

12"16 Fasts. / Bd.

6"

24"

6"

12"

15 Fasts. / Bd.

12"4 Spaces @ 18"

18 Fasts. / Bd.

6"

6"

6"

6"

18"

6" 24 Fasts. / Bd. 6"

6"

18"

22 Fasts. / Bd. 12"12"

6"

12"

20 Fasts. / Bd.

12"6"

18"

18"

28 Fasts. / Bd.

7 Spaces @ 12"

18"

24"6"

6" 6"

32 Fasts. / Bd.

3 Spaces@ 12"

6"7 Spaces @ 12"

24"

6" 6"

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1-18 1-19

Roof Insulations Application

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RS-8628 11-13 (Replaces 2-13)


4 x 8 (1.22 m x 2.44 m) Boards

33 Fasts. / Bd.

7 Spaces @ 12"

3 Spaces@ 12"

6"6"

24"

3 Spaces@ 12"

6"

48"

36 Fasts. / Bd.

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24"

12"

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36"

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39 Fasts. / Bd.

7 Spaces @ 12"

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24"

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48"

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42 Fasts. / Bd.

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Insulation Detail Patterns forFully Adhered MembraneUA-12

Insulation Detail Patterns forFully Adhered Membrane

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Insulation Detail Patterns forFully Adhered Membrane

UA-12 INS

Section Two:JM PVC Membrane Application Guides, Specifications, and Flashing Details

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JM PVC Membrane Application Guide

RS-8339 4-15 (Replaces 11-13)

Section Two:JM PVC Membrane Application Guides,

Specifications, and Flashing Details

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1.0 Introduction

This application guide describes standard procedures for installing Johns Manville (JM) PVC roofing systems and has been prepared for:

The Roofing MechanicJM recognizes that the success and long-term performance of our roofing systems depend upon the personal skill, experience and knowledge of the roofing mechanic.

JM PVC roofing systems offer important advantages for roofing crews. Roofing membranes can be installed year-round with proper roof deck preparation and some adjustments for weather conditions.

How to Use This GuideThis guide is divided into five sections:

1.0 Introduction2.0 Seaming and Fastening Methods3.0 Installing Mechanically Fastened and Fully Adhered Roof Systems4.0 Roof Penetrations5.0 Flashing Installation

This guide is designed for your convenience. These step-by-step instructions and illustrations should answer your installation questions and help you maintain top- quality craftsmanship when applying a JM PVC roofing system.

JM PVC MembranesDifferent types of JM PVC Membranes are manu-factured to meet a wide range of roof construction requirements. These membranes are used for mechanically attached and fully adhered roofing systems and are not intended for ballasted roofs.

Each membrane sheet is marked along the edge with overlap lines. These lines indicate the minimum overlap required and the area to be welded. Mechanically attached methods using in-lap fastening require a larger overlap. A minimum 1 (3.81 cm) welded seam is required for all systems.

Mechanically Fastened and Fully Adhered RoofsThere are two basic types of JM PVC roofing systems: mechanically fastened and fully adhered.

Mechanically fastened roofs secure the membrane to the roof with special fasteners, which vary depending on the roof deck material.

Several construction variations are possible with mechanically fastened roofs.

In fully adhered roofing systems, the membrane is bonded to the substrate with special adhesives.

Roof Preparation (Re-Roofing)Proper roof deck preparation is essential to simplify installation and prevent future conditions that may lead to roof leaks.

Carefully sweep all roof surfaces to remove all debris and dirt. Make sure the roofing area is completely smooth. Cut out large blisters on asphalt or coal tar pitch roofs. Repair holes or cracks in concrete, greater than (6.35 mm) wide with non-shrink grout.A slip sheet is often used under the membrane.

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JM PVC Membrane Application Guide JM PVC Membrane Application Guide

RS-8339 4-15 (Replaces 11-13) RS-8339 4-15 (Replaces 11-13)

3. Thoroughly dry all weld surfaces prior to welding. 4. Exercise caution when walking on dew, frost, ice or snow-covered roofs, since

the membrane may be extremely slippery.

How Hot Air Welding WorksHot air welding works by applying very hot air to the membrane surfaces, softening and fusing the surfaces together, thereby creating a permanently fused, bonded sheet. One of the major advantages of hot air welding is the fact that the seam comes to full weld strength immediately.

Reducing Stresses on Welded SeamsSeams must be loaded in shear and not in peel. A shear load would be in the plane (horizontal) of the roof membrane. A peel load would be lifting the seam perpendicular to the roof.

All roofs expand and contract during temperature changes. This can produce mechanical stress in the membrane. It is important to make welds that do not cause peel stresses to occur.

The correct and incorrect methods for welding at the roof surface and side corners are described below.

Correct: Weld the membrane to horizontal surface of the JM PVC-Coated Metal or membrane flashing, producing only horizontal stress (shear stress) on the welded seam. This also helps transfer stress to the roof structure.

Incorrect: The weld is subject to vertical stress (peel stress). Peel stresses weaken, and may eventually rupture the welded seam.

Hand-Held Hot Air WeldingMembranes can be hot air welded in many different conditions, including cold weath-er. A hand-held hot air welder is especially useful when welding membrane sections at corners or on vertical surfaces. Hand-held hot air welders are also used to weld membrane sections together or to weld membrane to JM PVC-Coated Metal, which has factory-laminated PVC membrane on its top side and a protective coating on the back.

Machine Hot Air WeldingLarge robotic hot air welders are used for high-speed hot air welding of membrane seams. A variable speed control for the electric motor lets you adjust the machines travel speed along the seam. Movement of the welder along the seam is determined by heat setting based on air temperature.

To hot air weld, insert the nozzle fully into the 2 (5.08 cm) weld zone, and raise the back wheel to allow the machine to ride on its two drive wheels. Dial in the desired temperature and speed.

To steer the tool along the seam, use the welders guide wheel. Watch the guide closely to make sure the machine stays on line.

Surface irregularities can cause the pressure wheel to move slightly away from the seam. If this happens, tap lightly on the ma-chines upper handle to maintain travel in a straight line. Consult the hot air welder manufacturer for specific recommendations.

As the hot air nozzle moves along the weld area, a wide drive wheel behind the nozzle applies immediate and uniform pressure to the heated area. The drive wheel presses

It provides a smooth surface and acts as a separator layer between an existing, damaged roof and the new roof to be applied. JM PVC Membrane application may require the installation of a separator material between the JM PVC Membrane and the substrate. This is most commonly achieved by the installation of a roof insulation board or an approved separator sheet.

When using mechanical fasteners, if you are unsure of the deck condition, perform pull-out tests of the fasteners being used to confirm sufficient pull-out strength. Contact your supervisor, who will obtain full details from the JM Roofing Services Group.

EquipmentThe following installation equipment may be needed:Hammer drill ScissorsElectric drill Wire brushRivet gun Chalk lineSnips ShovelGravel pusher PliersHammer TongsPull-out tester Gravel-moving equipmentHand-held hot air welder Lawn or linoleum rollerBrooms (soft and stiff) Drill bits (carbide, steel)Screw gun Reciprocal sawGloves Grounded extension cordsMeasuring tape Seam probeLadder First-aid kitPortable generator Utility knifeRope Screwdriver setEye protection Rubber malletWood saw RagsMetal crimpers Writing/marking instrumentsVise-grip pliers T-squareSolvent-resistant pan Rollers and brushes

2.0 Seaming and Fastening Methods

This section describes welding and fastening methods used to install JM PVC roofing systems, including: installing hot air welding membrane sections, using prefabricated JM PVC-Coated Metal parts, fasteners used to anchor the roof to the roof deck, and adhesive application of the membrane.

Seaming PrecautionsBefore welding, ensure area is clean and dry. Remove dirt or contamination before welding by using low-sudsing soap and water followed by JM Single Ply Membrane Cleaner or other membrane cleaner. As a last resort, cut away the affected sheet section and replace with new material.

Hot air welding equipment is required to make all field seams. Welding speeds will be slower in high humidity conditions or at low temperatures.

General Suggestions to Avoid Problems in Cold Weather (Below 50F [10C])1. Store all JM PVC materials in warm, dry area away from sparks and open flames,

to avoid condensation problems that could affect weld quality.2. Take at least twice the usual number of seam samples to test for peel resistance,

since the possibility of inferior welds is greater.

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JM PVC-Coated MetalJM PVC-Coated Metal is a special flashing material used to fasten some JM PVC Membranes at roof edges (perimeters), walls and decks, and around penetrations. It is supplied in large, galvanized sheets with JM PVC Membrane material laminated to one side. The roof membrane is welded to this surface. The other side is covered with a protective coating (bronze color).

JM PVC-Coated Metal Flashing is formed off site by the roofing contractor, to the shapes required for attaching the membrane. Preforming numerous perimeter flashing sections in the same shape is easily and accurately done in the sheet metal shop. Prefabrication reduces installation time. Special parts such as scuppers, however, are formed on the job to match the opening size and save time.

JM Fasteners and PlatesUse appropriate fasteners and plates on mechanically fastened roofs to fasten the membrane and/or insulation to the roof deck. Special screws and fasteners simplify attachment of roof layers to wood, steel, concrete, lightweight or other decks.

The most common method of installing a JM PVC mechanically fastened roofing system is the in-lap method, where the membrane overlap covers and protects the installed fasteners.

JM High Load and Extra High Load Fasteners and Plates are used to attach the roof system to steel and wood decks. Special fasteners are used for lightweight insulating concrete and concrete decks.

JM supplies many fasteners for mechanically fastened roofs. There are several key rules to follow when installing a mechanically fastened roof:

1. Use appropriate fastener type for substrate.2. Securely anchor fasteners to roof deck.3. Flatly seat and secure plates on substrate.4. Do not tighten fastener/ plate assembly excessively, which causes depression

of insulation.5. Achieve minimum thread penetration of (1.91

cm) through metal decks, 1 (2.54 cm) into wood decks and 1 (2.54 cm) into concrete decks with special spikes. Plywood and OSB decks require a minimum (6.35 mm) penetration through the bottom of the deck.

6. Fasteners must go through the top flange on metal decks.

Membrane AdhesivesJM PVC Membrane Adhesives (Low VOC and Water-Based)JM PVC Membrane Adhesives are designed for bonding JM PVC Membrane to approved substrates such as metal, wood, concrete and certain roof insulations. Low VOC adhesive can be used for adhered wall flashings or other vertical surfaces. The adhesives are easily spread, have good initial tack and dry to an elastomeric bond.

For additional product-specific information, refer to the JM PVC Membrane Adhesive data sheets for low VOC and water-based products.

the heated seam area together. Check all machine hot air welded seams for voids and repair with a hand-held hot air welder before the end of each working day. Always run several test welds with the machine each time you begin welding and/or if the machine has been shut down for any appreciable length of time.

With either method, perform a 4 or 5 (1.22 m or 1.52 m) test weld before beginning each days application and any time the hot air welder has been turned off for any length of time, to check peel strength, consistency, weld width, etc., and to adjust the welder.

First, adjust the temperature of the hot air welder to produce a shiny membrane surface without burning the membrane. Fully insert the tip of the hot air welder into the seam, moving it slowly backwards. As the membrane softens, press the membrane surfaces together with a silicone rubber roller from the inside edge to the outside edge of the seam. Take care to produce a continuous weld with no air pockets.

Repairing Scorched MembranesIf the membrane surface is overheated, a good weld cannot be achieved. The burned or discolored membrane must be patched.

To repair a burned section, cut away the damaged material at least 1 (2.54 cm) beyond the burned edges. Patches should be cut to extend at least 3 (7.62 cm) beyond all damaged edges. Allow for a minimum 1 (3.81 cm) weld width on all sides.

Center the patch over the cut area and weld to the membrane, using normal welding procedures. Cut all patches in a square or rectangular shape with round corners for a neat, finished roof appearance.

T-Joints and Testing SeamsT-JointsThe t-joint occurs where three layers of membrane overlap. Voids may occur along the edge of the middle layer of membrane. To close the void, gently lift the upper membrane sheet and apply sufficient hot air to heat the membrane surfaces. Then, using the edge of a silicone rubber roller, roll and fuse the upper membrane surface into the lower membrane. A crease developed along the intersection of the two surfaces indicates a proper weld. JM recommends patching all t-joints to include base flashing using a 4.5 (11.4 cm) rounded piece of reinforced field membrane or JM PVC T-Joint Patch.

Testing SeamsHot air welded seams may be tested as soon as the seams cool. After welding, carefully test every seam and t-joint along its entire length. Do this by running a blunted scratch awl, cotter key puller or other round-tipped, blunted tool along the seam edge while applying firm, steady pressure. It is imperative to avoid scoring the membrane that has just been welded. Any penetration of the probe into the seam indicates a void in the weld, which must be repaired. Continuous seam probing will tend to sharpen the tip of the probe, so it is important to blunt the tip of the probe regularly.

Test all welded seams for integrity and continuity before the end of each work day. In addition to probing, take seam samples to verify seam quality as necessary.

Cut the samples across the seam 6 (15.24 cm) on each side of the seam and 2 (5.08 cm) wide. Peel these samples by hand to test seam strength. Good seams will be virtually impossible to peel, and should delaminate the PVC film from the reinforcing scrim. Cut and test a minimum of three seam

samples each day in the morning, at noon and at days end. Take additional test cuts when weather conditions change or after work interruptions when the automatic hot air welder has been shut off.

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Wall Flashing with JM PVC-Coated MetalJM PVC-Coated Metal Base Flashing serves as a roof termination on roofs with low parapet walls. A metal coping overlaps the JM PVC-Coated Metal Base Flashing and serves as a counterflashing on walls which are 8 (20.32 cm) high or less.

Higher walls are sealed with JM PVC Membrane Flashing. See Membrane Flashing section for application of fully adhered and mechanically attached flashings.

Gravel StopsThe top of the gravel stop must be at least 1 (3.81 cm) above the nailer height. This may vary, depending on roof conditions. The bottom edge of the flashing should extend at least 1 (2.54 cm) below the nailer on the vertical fascia surface.If the vertical gravel stop face exceeds 4 (10.16 cm), fasten per the job specifications, but not less than a 20-gauge to 24-gauge (0.91 mm to 0.61 mm), continuous galvanized steel clip on the fascia.

Fasten continuous steel cleats per the job specifications, but not less than two roofing nails, between flashing lengths. This provides a rigid support for the gravel stop and helps align the section. Use lengths of gravel stop to quickly position each cleat. Fasten the gravel stop to the wood nailer with roofing nails spaced 6 (15.24 cm) o.c. and staggered. Leave a 38 to (9.53 mm to 1.27 cm) gap for expansion between gravel stop lengths. Apply aluminum tape to the joint prior to heat welding the joint covers and membrane in place.

Johns Manville recommends installing two fasteners per butt joint to prevent rocking. This will also secure the edges at the break.

Membrane FlashingsInstall all membrane flashings at the same time as the roof membrane. Do not use temporary flashings. If water penetrates the flashings, immediately replace all affected materials.

Use only JM PVC fully adhered or mechanically attached flashings or prefabricated flashings, depending on job circumstances. Secure the mechanically attached flashings to the parapet wall at a maximum vertical distance of 18 (45.72 cm) o.c., and horizontally to the parapet at maximum spacing of 12 (30.48 cm) o.c. Secure adhered flashings to the parapet wall at 60 (152.4 cm) vertical intervals. All adhered surfaces must be compatible with JM PVC roofing membranes. If

existing asphalt flashing remains, then 1532 (1.91 cm) thick plywood, 916 (1.43 cm) OSB, 26-gauge (0.45 mm) galvanized metal (if using adhered flashings), or 9 oz./yd2 (0.31 kg/m2) polyester fleece must be secured to the asphaltic surface as a barrier before applying JM PVC Membrane Flashings. Paper slip sheets are not acceptable for use as asphalt barriers. Apply adhesive as noted in Fully Adhered Systems on page 2-10 of this guide. Do not apply adhesive to any flashing areas that will be welded.

Extend all flashings a minimum of 8 (20.32 cm) above the roof level. Contact the JM Roofing Services Group for recommendations if this cannot be done. Terminate all JM PVC Membrane Flashings per the applicable detail.

Roof Substrate MaterialsVapor RetardersVapor retarders prevent moisture or condensation from entering the building or passing from the building into the roof system. To provide an effective shield against water vapor, seal off all vapor retarders at roof edges and penetrations.

3.0 Installing Mechanically Fastened and Fully Adhered Roof Systems

This section describes the procedures and materials used to install mechanically fastened and fully adhered JM PVC roofs. Included are flashing installation, membrane installation, membrane fastening procedures for mechanically fastened roofs and adhering roof membranes.

Installation PreparationNailersAfter properly preparing the roof deck, install wood nailers when required. Place nailers on the perimeter of the roof, along the top of parapet walls and, where required, around roof penetrations and along roof expansion joints. Set the height of the nailers flush with the roof insulation.

Space fasteners for wood nailers per the job specifications, but not greater than 24 (60.96 cm) o.c. with at least three fasteners per nailer, depending on nailer length. Each fastener must resist a minimum pull-out force of 200 lb/ft (298 kg/m) in any direction. JM PVC-Coated Metal Flashings are fastened to wood nailers. When using membrane flashings, fasten the field sheet to the deck with a fastener/plate system.

JM PVC-Coated Metal FlashingPreformed JM PVC-Coated Metal Flashing is fastened around the roof perimeter (edge and base flashings) and roof penetrations. Welding the membrane to JM PVC-Coated Metal Flashings at these points provides a watertight seal.

JM PVC-Coated Metal Flashing (along with wall fastening strips) is manufactured in 10 (3.05 m) lengths. Leave a 38 to (9.53 mm to 1.27 cm) maximum gap between each length to allow for thermal expansion. Aluminum tape should be applied over all joints in JM PVC-Coated Metal prior to heat welding the joint covers and membrane in place.

The following are instructions for installing JM PVC-Coated Metal Base Flashing, wall fastening strips and gravel stops.

Base Flashing with JM PVC-Coated MetalSet the base flashing width along the horizontal roof surface (flange) at least 3 (8.89 cm) to allow for welding. Flashing must extend a minimum of 8 (20.32 cm) up vertical wall surfaces.

Fasten base flashing to nailers per the job specifications, as a minimum using galvanized roofing nails, spaced a maximum of 6 (15.24 cm) o.c. to resist a minimum pull-out force of 200 lb/ft (298 kg/m). Nail heads should be at least 38 (9.53 mm) in diameter, penetrat-ing into the nailer at least (1.91 cm).

You may fasten JM PVC-Coated Metal Base Flashing directly to the parapet wall under some conditions. Consult job specifications. Fasteners must provide a minimum pull-out force of 200 lb/ft (298 kg/m), placed at a maximum height of 2 (5.08 cm) above the top surface of the JM PVC Membrane.

Fasten JM PVC-Coated Metal Base Flashing to concrete with concrete fasteners. Space fasteners per job specifications, but not greater than 12 (30.48 cm) o.c. and drive at least 1 (2.54 cm) into concrete to obtain the required pull-out strength. JM PVC-Coated Metal Base Flashing can also be fastened to hollow block (cinder block) walls, with the appropriate fasteners. Consult JM for more details. JM PVC Coated Metal Flashing can be used as an asphalt separator in lieu of plywood or galvanized metal.

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Corners and PerimetersRefer to the local code requirements, project specifications or FM Global requirements when determining fastener rates. The requirements to calculate perimeter areas are as follows:

1. 40% of the height or 10% of the lesser plan dimension, whichever is less, but never less than 4% of the lesser plan dimension (minimum 3 [91.44 cm]).

2. For mechanically fastened systems, only perimeter rolls may be used in these areas. The width of the perimeter rolls should be no greater than 60% of the width of the field sheets in the perimeters, and no greater than 40% of the width in the corners.

Corner AreasAll corners shall be the intersections of the perimeter areas. Refer to the local code requirements, project specifications or FM Global requirements when determining corner layouts for perimeter sheets. Typically, one of the following layouts is used in the corners:

1. The perimeter rolls should be fastened all the way into the corner. The other perimeter sheets are fastened up to the previously installed perimeter sheets, and then the fastener rows are continued to the corner through the top of the previously installed sheets and a cover strip of reinforced membrane or a JM PVC T-Joint Patch is installed over the fasteners for a watertight seal.

2. The perimeter rolls should be run perpendicular to the flutes in steel deck applications. Additional fasteners should be installed in rows that are no greater than 40% of the width of the field sheets. These fastener rows should then be stripped in with reinforced JM PVC Membrane, or Detail Strip.

Section 2 describes the plates and methods used to mechanically fasten JM PVC roofs. The following are step-by-step procedures for in-lap fastening:

The In-Lap Method1. Roll out one roll of membrane over the slip sheet (if required) or acceptable

insulation board. Let it relax 15 to 30 minutes or as needed to compensate for any residual roll tension.

2. Secure the plate along the edge of the membrane, maintaining at least a (1.27 cm) distance from the edge of the plate to the outer edge of the roll. Fastener and plate spacing is per FM Global requirements and/or job specifications.

3. Tightly screw down the plates (do not overdrive the fastener) using an appropriate screw gun unit with adjustable clutch. Make certain to drive the fastener perpendicular to the surface of the substrate and to properly penetrate the deck surface. On steel decks, the screws must be fastened into the top flanges of the metal deck.

4. After securing the edge of the first membrane roll, roll out the next adjacent roll of membrane. Position this roll so that its common edge fully overlaps the row of plates and fasteners just installed. Maintain a minimum overlap of 6 (15.24 cm) (depending on plate size) to cover the plates, and leave the required 1 (3.81 cm) minimum for the seam weld.

5. Weld the overlap seam.

Air BarriersAir barriers should be considered on jobs where high internal air pressure exists, such as airport hangars or distribution warehouses with many outside openings (such as loading docks), outdoor amphitheaters, etc.

InsulationInsulation must be independently fastened to the roof deck in mechanically attached and adhered systems. Adhering certain insulations in hot asphalt or cold adhesives is sometimes acceptable for adhered systems. For specific requirements, contact the JM Roofing Services Group.

Always cut insulation to fit closely around all roof penetrations. Around drains, taper insulation a minimum of 36 x 36 (91.44 cm x 91.44 cm) for proper drainage.Apply rigid insulation directly over fluted steel decks to provide smooth, continuous membrane support. Insulation should be installed with long edges parallel to the direction of the deck and supported by the deck flange. When butting insulation layers, do not allow the edge of either board to overlap an open flute. Cut the insulation so the edge of the board is about at the center of, and supported by, the flange.

Slip sheetsA slip sheet is often used under the membrane on mechanically fastened roofs. It provides a smooth surface over which the membrane can freely expand or contract when temperature variations cause changes in the roof structure.

The slip sheet is loosely laid and usually overlapped, depending on the slip sheet selected. It should be neatly cut to fit closely against roof edges and around penetrations. An approved slip sheet must be used between the JM PVC Membrane and any polystyrene insulation product.

Coal Tar PitchCoal tar pitch roofs give off noxious fumes and vapors that affect PVC roofing membranes. You must separate coal tar pitch roofs from the vinyl in the following manner:

Place insulation with a minimum R-value of 8.6 (hrft2F)/ Btu [1.76 m2C/W] and a minimum thickness of 1 (3.81 cm) atop the roof, with the joints of the insulation butted together at all four sides.

Installing MembranesUnroll the JM PVC Membrane and position without stretching. Allow the membrane to relax at least 15 minutes when the temperature is above 60F (16C), or 30 minutes when the temperature is below 60F (16C), prior to installation. Inspect for any damaged membrane. Remove sections of the membrane that are creased or damaged.

Install all roof deck materials (vapor retarders, insulation and slip sheet) in complete sections, and cover with the membrane immediately to produce weather-tight sections each day. Phased construction is not permitted.

For mechanically attached systems on steel decks, the membrane sheets must be applied perpendicular to the ribs (flutes) of the deck. This method offers two advantages. First, most roofs are pitched to drain along the roofs length. Many roofs drain from each end to the middle. In this case, the installation is started at the wall edge, and the membrane is welded and sealed immediately against water. It also requires less work to seal the shorter edge of the roof with a water cutoff at the end of the work day. And you will save money by removing and discarding less cut-off material.

Welding Membranes to Roof EdgesThe JM PVC-Coated Metal Edge is installed and is stripped into the field sheet with a detail strip.

Mechanically Fastened SystemsTo prevent wind uplift and secure the membrane on mechanically attached roofs, fasten the membrane to the roof deck with metal plates and acceptable fasteners.

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Low VOC, Two-Sided Application for Plain-Backed (Smooth-Backed) MembraneApply low VOC adhesive in a smooth, even, thin coat to both membrane and approved substrate at the rates listed on specific product data sheets. Most applications apply approximately half the listed rate to the membrane and the other half to the substrate. For porous substrates such as wood and gypsum, apply more adhesive on the substrate.

PVC systems require adhesive to become tacky to the touch on both surfaces without stringers on the substrate only. Membrane side must dry slightly to the point where stringers are visible. Do not allow adhesive on both sides to dry completely; if no longer tacky it cannot be used.

Water-Based, Two-Sided Application for Plain-Backed (Smooth-Backed) Membranes OnlyApply water-based adhesive in a smooth, even, thin coat to both the membrane and approved substrate at the rates listed on specific product data sheets. Most applications apply approximately half the listed rate to the membrane and the other half to the substrate. For porous substrates such as wood and gypsum, apply more adhesive on the substrate.

Adhesive should be tacky at point of assembly: approximate time will vary depending on the environmental conditions. Once the adhesive begins to change color (from white to clear) and feels tacky, but with no stringers as with the low VOC adhesive, carefully roll the membrane to the substrate. Avoid capturing air or creating wrinkles during this process. If adhesive is completely dry or too wet (still all white), adhesion will be compromised.

Water-Based, One-Sided Application for Fleece-Backed Membranes OnlyFor fleece-backed membrane ONLY, apply the full rate of water-based adhesive to the substrate ONLY. Do not apply adhesive to the membrane. DO NOT apply to the fleece-backed membrane or in the weld area; keep both surfaces clean and dry. Assemble membrane and substrate while adhesive on the substrate is still wet.

Water-Based Adhesives Cautions Water-based adhesives are white; if product appears to have disappeared after

application then adhesive is too dry and will need to be reapplied. Do not over apply. Use the coverage rate chart in this section; too much adhesive

will result in curing issues. Prior to application and curing, water-based adhesive can NEVER be exposed or

stored to temperatures below 40F. Do not apply when ambient temperatures are expected to drop below 40F within 48 hours after application.

Suggested Coverage Rate Ranges

Adhesive Ft2/gal (gal/sq)

Low VOC 90 (1.11) 80 (1.25) 70 (1.43) 60 (1.67) 50 (2.0)

Water-Based 130 (0.77) 120 (0.83) 110 (0.91) 100 (1.0) 90 (1.11)Product Less Adhesive / More Adhesive

Insulation and Cover Boards

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DensDeckWood Fiber

ENRGY 3

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SECUROCKGypsum Fiber

Roof Board

Notes: 1. Listed rates are for finished roofing areas. 2. See JM requirements for correct application method. 3. Two-Sided Application: Most applications apply approximately half the listed rate to the membrane and the other half to the substrate. For porous substrates such as wood and gypsum, apply more adhesive on the substrate. 4. One-Sided Application: Apply the full amount to the substrate only. If the rate is 1.0 gal/sq, the full gallon goes on the substrate only.

Fully Adhered SystemsAll membranes and substrates to be adhered must be approved by Johns Manville. Both surfaces must be clean, smooth, dry, compatible and free of contaminants and grease/ oil. All fasteners, if required, must be properly seated and plates flush, leaving an acceptable surface to receive adhesive.

Unroll the membrane and allow it to relax at least 15 minutes before applying adhesive; longer time is necessary in colder weather.

Position the membrane with a 3 (7.62 cm) overlap between sheets. Fold membrane back one-half of the length of the first sheets length to expose its bottom side.

Make sure adhesive container is sealed. Turn upside down and wait a minimum of five minutes then turn containers right side up. Carefully open and vigorously stir until adhesive is a uniform color and all solids are dispersed, with NO SWIRLS.

Saturate roller by dipping into can. Roll adhesive onto substrate and membrane for smooth-backed membrane, and substrate only for fleece-backed membrane.

For solvent-based adhesives, the appearance of a spider web effect will occur with stringers off the roller when the roller needs to be redipped into the adhesive. It will also be hard to push the roller.

Follow directions in this section for specific adhesive and membrane type (smooth-backed or fleece-backed) as directed for proper applications.

When adhesive is ready, carefully roll the membrane into the substrate avoiding wrinkles. Apply even pressure with a lawn or linoleum roller (minimum 75 lb [34 kg]) to ensure good contact between the membrane and substrate.

Do not apply adhesive in the seam area; seams are to remain clean and dry. Avoid puddling of adhesive. With adhesives, more is not necessarily better. Over-coating adhesives will lead to poor adhesion.

Do not use with polystyrene foam.

Adhesive coverage, open time and dry time rates can vary dramatically depending on the particular substrate and environmental conditions. Coverage rate charts, stated herein, are approximate only. If FM Global or UL approval is required, please consult the specific RoofNavSM or UL Certification Directory for specific application rates.

Substrate for Adhered Membrane

Substrate JM PVC JM PVC Fleece-Backed

Lightweight Concrete N/A WB

Concrete N/A WB/HA

Invinsa WB/LVOC WB

SECUROCK Gypsum Fiber Roof Board WB/LVOC WB/HA

Wood Fiber P/A P/A

ENRGY 3 WB/LVOC WB

DensDeck Prime WB/LVOC WB

Key: WB = Water-Based LVOC = Low VOC HA = Hot Asphalt N/A = Not Applicable P/A = Pre-Approval Required

Notes: 1. Water-Based Adhesive: Use the two-sided contact application method for all smooth-backed single ply membranes. Use the one sided application method for fleece-backed membranes only. 2. DensDeck: Priming of the board is required. 3. Not suitable for SECUROCK Glass-Mat roof boards. 4. Do not use solvent or low VOC solvent with fleece-backed membrane.

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JM PVC Membrane Application GuideUrethane Adhesive (RSUA)Installation Instructions

JM PVC Membrane Application GuideUrethane Adhesive (RSUA)

Installation Instructions

Coverage Fleece-Backed MembranesBead spacing: 12 o.c. Applied bead size: min.

PackagingTypical Coverage Rates

per package* ft2/gal gal/100 ft2*Cartridge 300 ft2/case 189

0.55 gal 2,000 ft2/set**

20015 gal drum 6,000 ft2/set** 50 gal drum 20,000 ft2/set**



per package* ft2/gal gal/100 ft2*Cartridge 150 ft2/case 94 1.15 gal 1,000 ft2/set**

100 1.015 gal drum 3,000 ft2/set** 50 gal drum 10,000 ft2/set**



per package* ft2/gal gal/100 ft2*Cartridge 100 ft2/case 63 1.595 gal 667 ft2/set**

67 1.4915 gal drum 2,000 ft2/set** 50 gal drum 6,667 ft2/set**

Coverage Board StockBead spacing: 12 o.c. Applied bead size: - min.


per package* ft2/gal gal/100 ft2*Cartridge 300-400 ft2/case 189-252

0.4-0.55 gal 2,000-2,500 ft2/set**

200-25015 gal drum 6,000-7,500 ft2/set** 50 gal drum 20,000-25,000 ft2/set**



per package* ft2/gal gal/100 ft2*Cartridge 150-200 ft2/case 94-126 0.8-1.15 gal 1,000-1,250 ft2/set**

100-125 0.8-1.015 gal drum 3,000-3,750 ft2/set** 50 gal drum 10,000-12,500 ft2/set**



per package* ft2/gal gal/100 ft2*Cartridge 100-133 ft2/case 63-84 1.19-1.595 gal 667-833 ft2/set**

67-83 1.2-1.4915 gal drum 2,000-2,500 ft2/set** 50 gal drum 6,667-8,333 ft2/set**

* Coverage rates are approximate and may vary based on substrate type and application. Approved substrates include structural concrete decks, JM Vapor Barrier SA, ENRGY 3, RetroPlus, DuraBoard, Invinsa, Securock, DensDeck, DensDeck Prime, smooth modified asphalt membranes and granulated asphalt membranes. Please contact JM Technical Services for other approved substrates.

** A set is defined as an equal Part 1 and Part 2.

General Application Instructions

All applications must be approved by Johns Manville.

All surfaces must be clean, smooth, dry, compatible and free of dirt, debris, oil/grease and gravel. All fasteners, if required, must be properly seated and plates flush, leaving an acceptable surface to receive ad hesive.

JM RSUA Packaged in 1,500 ml CartridgesRemove the molded cap at the top of the cartridge and attach the supplied static-mix-ing nozzle to the threaded mixing head. Place the cartridge into the appropriate JM RSUA applicator.

JM RSUA Packaged in 5-Gallon BladderRemove bladder from box. Remove the white disc closure from the top of the packaging and extend quick-connect spouts in both Part 1 and Part 2 boxes. Invert bladder and place in appropriate tray on the Garlock Cyclone (or similar). Box labeled Part 1 must be in area of tray labeled Part 1 and box labeled Part 2 in area labeled Part 2.

Connect the black Part 1 fitting to the black inlet hose fitting Connect the gray Part 2 fitting to the gray inlet hose fitting Operate pump according to manufacturers instructions On a scrap piece of material, dispense a small amount of RSUA. Let rise to ensure

equipment and adhesive are on-ratio

For Membrane ApplicationUnroll the membrane and allow it to relax at least 15 minutes before applying adhesive; longer time may be necessary in colder weather. Position the membrane with a 2 (5.08 cm) overlap between sheets. Fold membrane back one-half of the length of the first sheets length to expose its bottom side.

For Board and Membrane ApplicationApply JM RSUA directly to the substrate and allow it to begin to rise and build body before placing fleece-backed membrane or board stock into the adhesive.

Membrane attachment requires the membrane be rolled with a 150lb roller to ensure positive contact between membrane, adhesive and substrate.

Board stock attachment requires the board stock to be walked in to ensure positive contact between the board stock, adhesive and substrate.

Do not allow the adhesive to skin over. Eliminate uneven surfaces to ensure positive contact between the insulation board/ membrane and substrate.

Typical Lock-Down/Tack-Free Times

Ambient Temperature Lock Down/Tack Free Time

40F 9-10 minutes

60F 6-7 minutes

80F 4-5 minutes

100F 3-4 minutes

Unused material can be applied at a later date by simply plugging the cartridges (with provided caps) and using a new static mixing nozzle. When using the box packaging, properly clean dispensing wand and pump unit according to the pump manufacturers recommendation.

Refer to the Safety Data Sheet and product label prior to using this product.

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Weld the membrane collar continuously to the field sheet and/or the metal collar. Field wrap JM PVC Detail Membrane around the pipe stand and adhere to the vent pipe, while flanging the bottom of the field wrap. Extend field wrap flange at least 1 (2.54 cm) onto the membrane stretch collar and weld continuously to the collar. If the pipe has asphalt or other contaminants on it, it must be cleaned and wrapped completely with aluminum tape before installing the flashing.

Method B. Installing Prefabricated Vent Pipe Boots (See Detail P-FP-01) JM PVC Pipe Boots are available to accommodate various diameters for installation over pipes.

Prior to pipe boot installation, remove any asphaltic deposits from vent pipes before using this prefabricated boot. Completely wrap any remaining asphalt with aluminum tape before plastic boot comes into contact with pipe. Bring the JM PVC Field Sheet to the pipe and attach with a minimum of four fasteners around the vent stack. Place the prefabricated pipe boot over the pipe and weld continuously around the bottom lip of the boot.

Apply JM Single Ply Caulk behind the pipe boot turn-up before pulling draw band tight around the vent pipe, and to the top of the draw band to seal against water intrusion.

Penetration PocketsJM Penetration Pockets are either premolded, plastic units available in standard sizes, or are fabricated using JM PVC-Coated Metal.

Leave an open, overlapped seam at the center of one side so the penetration pocket may be spread around penetrations before final riveting. The overlap or opening must be covered with aluminum tape and detail membrane prior to stripping flange. Minimum penetration pocket height is 4 (10.16 cm).

Fasten penetration pocket flanges at the outside to the deck or nailer. With strips of JM PVC Membrane, strip in penetration pocket around all four sides, and weld continuously to JM PVC-Coated Metal as you would a field sheet.

Fill penetration pocket with JM EPDM/PVC Pourable Sealer. Fill until mounded above penetration pocket. Slope from pipe to penetration pocket edges to shed water (no ponding water should be present in penetration pocket). Fasten penetration pockets greater than 18 x 18 (45.75 cm x 45.72 cm) to nailers securely anchored to the deck.

Fabricated penetration pockets follow the same procedure, except that the plastic flange is fastened to the deck before being stripped in. Since you can weld the plastic penetration pocket to the strip of membrane, continuously weld the strip to the flange and the field sheet.

WalkwaysIf pavers are used as permanent walkways for maintenance of rooftop equipment, use an additional layer of JM PVC Membrane or a layer of JM Polyester Mat Protection Material under paver blocks to protect the membrane.

Another walkway option on a mechanically fastened or adhered roof is to weld strips of JM PVC Walkpad or Heavy- Duty Walkpad material directly to the membrane. See details P-PT-05, 06, & 07 and note that walkpads should not be installed over field seams. This material provides an almost continuous walkway, and is embossed for a skid-resistant surface. It also minimizes added weight on roofs. JM PVC Walkpad or Heavy-Duty Walkpad should be continuously welded to the membrane and checked for voids, which must be repaired with a heat welder. Continuously welding the walkway material will seal against grit or water entry. Fully adhered systems require walkpads to also be fully adhered.

Water CutoffsSensitive materials such as insulation or slip sheets can be damaged or destroyed by water. Apply water cutoffs to seal the edge of roofing layers at the end of the work day. If a cutoff is required on an existing gravel-surfaced roof, completely spud off the gravel for a watertight connection.

4.0 Roof Penetrations

This section describes procedures for fabricating, installing and welding typical roof penetrations to the membrane. Included are drains, vent pipes and penetration pockets.

Weld membranes to flashings around roof penetrations and to base flashings as a continuous, waterproof roofing shield. Install nailers where required around penetrations for flashing support.

DrainsThere are several methods for flashing drains with JM PVC roofing membrane. The most common method is to taper insulation to the drain bowl. Next, run slip sheet (if required) over insulation to edge of drain bowl interior.

Apply one tube of JM Single Ply Sealing Mastic around the drain bowl. Apply the JM PVC Membrane to overlay drain area, and cut out hole in center area 2 (5.08 cm) smaller than metal drain bowl diameter. Cut round holes one-half the size of bolt diameter at drain bolt penetrations. Make sure there are no seams or fasteners through the drain clamping ring. Ideally, there should be no seams or fasteners in the drain sump.

Carefully press membrane drain flashing over drain bowl area and work into the mastic to form seal. Place metal clamping ring over membrane flashing so that bolt holes line up, and then tighten the bolts (see detail P-DV-08).

Vent PipesThere are two primary methods for installing vent pipes in JM PVC roofing systems:

Method A. Sealing Pipe Base with JM PVC Flashing (P-FP-06)Prepare a square JM PVC Detail Membrane stretch collar to overlap the securement plate edges by at least 4 (10.16 cm), to accommodate sheet movement and a 1 (3.81 cm) weld width. Round off all corners. Cut a hole in the center of the membrane that is about two-thirds of the diameter of the pipe. Center hole over the pipe; heat area around the hole with a heat welder, and stretch fit membrane over the pipe to create a 1 (2.54 cm) turn-up, with the collar seated flush on the deck.

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Step 2

Overlap the successive layer of membrane flashing 2 (5.08 cm) minimum over the previously installed sheet. Provide the minimum base overlap as required.

Step 3

Form membrane to wall as required. The JM PVC Membrane Flashing must extend a minimum of 12 (30.48 cm) horizontally in each direction from the corner point.

Cut the membrane flashing base lap to allow the membrane flashing to turn the corner. Install fasteners at corners where required by system details.

Step 4

Turn the corner and apply the membrane flashing as required. Round the corners of the membrane base overlap on each side of the corner and

at all ends of the flashing base overlap.

5.0 Flashing Installation

Machine Hot Air Welding

Step 1

Set the heat and speed setting on the automatic welding machine based on field conditions and air temperature. Make certain that proper power supply is available.

Align the welding machine with the edge of the membrane seam lap as required, and insert the nozzle fully into the 1 (3.81 cm) weld zone.

Raise the back wheel to allow the machine to ride on its two drive wheels. Adjust the heat and speed setting on the automatic welding machine as required. To steer the machine along the seam, place the small guide wheel (located at

the front of the machine) against the seams edge. Adjust and maintain the wheel against the seams edge as required.

Align drive wheel and welder tip and extend 18 (3.18 mm) beyond the edge of the seam so there are no loose edges of membrane.

JM PVC Membrane Base FlashingOutside Corner

Step 1

Cut JM PVC Membrane Base Flashing extending vertically 8 (20.32 cm) minimum, leaving enough membrane at the flashing base to overlap fasteners/plates and to provide for a 1 (3.81 cm) minimum continuous weld. Apply adhesive to both membrane and substrate as required. See Fully Adhered Systems section in the appropriate guide specification.

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Step 3

Form membrane to wall as required. The JM PVC Membrane Flashing must extend a minimum of 12 (30.48 cm) horizontally in each direction from the corner point.

Fold over the membrane flashing base lap (forming a pigs ear) to allow the membrane flashing to turn the corner.

Turn the corner and apply the membrane flashing as required.

Step 4

Using a pair of shears, make a diagonal cut in the pigs ear, forming an overlap. Round the corners of the membrane base overlap on each side of the corner and at

all ends of the flashing base overlap.

Step 5

Using a hand-held hot air welder and roller, heat weld the bottom flap of the pigs ear to the field membrane and the top flap over the bottom flap.

Step 5

Install a JM PVC Universal Corner welded to the flashing sheet with a continuous 1 (2.54 cm) minimum heat weld. Care must be taken to leave an unwelded area at the center of the corner to allow for movement.

Probe and check all seams.

JM PVC Membrane Base FlashingInside Corner

Step 1

Cut JM PVC Membrane base flashing extending vertically 8 (20.32 cm) minimum, leaving enough membrane at the flashing base to overlap fasteners/plates and to provide for a 1 (3.81 cm) minimum continuous weld. Apply adhesive to both membrane and substrate as required. See Fully Adhered Systems section in the appropriate guide specification.

Step 2

Overlap the successive layer of membrane flashing 2 (5.08 cm) minimum over the previously installed sheet. Provide the minimum base overlap as required.

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Step 3

Form membrane to curb as required.

Step 4

Round the corners of the membrane base overlap on each side of the corner and at all ends of the flashing base overlap.

For each corner: Install a JM PVC Universal Corner to the flashing sheet with a continuous 1 (2.54 cm)

minimum heat weld. Care must be taken to leave an unwelded area at the center of the corner to allow for movement.


Step 6

Install a JM PVC Universal Corner (not pictured) welded to the flashing sheet membrane with a continuous 1 (2.54 cm) minimum heat weld. Care must be taken to leave an unwelded area at the center of the corner to allow for movement.


JM PVC Membrane Curb Flashing

Step 1

Cut JM PVC Membrane Base Flashing extending vertically 8 (20.32 cm) minimum, leaving enough membrane at the flashing base to overlap fasteners/plates and to provide for a 1 (3.81 cm) minimum continuous weld. Apply adhesive to both membrane and substrate as required. See Fully Adhered Systems section in the appropriate guide specification.

Step 2

Overlap the successive layer of membrane flashing 2 (5.08 cm) minimum over the previously installed sheet. The JM PVC Membrane Flashing must overlap a minimum of 2 (5.08 cm) from the corner point as shown. Provide the minimum base overlap as required.

8"(20.32 cm)

Min.

2"(5.08 cm)Min.

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On remaining two sides of the curb: Cut JM PVC Membrane Base Flashing as required to conform to the canted curb

base with mitered corners at the base overlap. Form membrane to curb as required.

Step 4

Round the corners of the membrane base overlap on each side of the corner and at all ends of the flashing base overlap.

Step 5

For each corner: Install a JM PVC Universal Corner welded to the membrane base flashing with

a continuous 1 (2.54 cm) minimum heat weld. Care must be taken to leave an unwelded area at the center of the corner to allow for movement.

Note: The JM PVC Universal Corner should extend a minimum 2 (5.08 cm) beyond the opening at the top and bottom of the canted curb. In some instances one corner may not cover both openings.


JM PVC Membrane Canted Base Curb Flashing

Step 1

On two opposite sides of the curb: Install JM PVC Membrane Base Flashing extending vertically 8 (20.32 cm) minimum,

leaving enou

JM Roofing Systems Application Guide Book 3

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Transcript of JM Roofing Systems Application Guide Book 3