InstallationGuide en v1 Chapter 7 Floor and Roof

8/13/2019 InstallationGuide en v1 Chapter 7 Floor and Roof

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7.0FLOORANDROOFSYSTEMS


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144 7.1 Wood Floor Connections

7.1 WOODFLOORCONNECTIONS

7.1.1 WOODFLOORSONARXX WALLSWhen using ARXX for a foundation wall, stem wall or crawlspace only, the floor and upper wall framing are

connected to and bear on the sill plate, similar to conventional construction. The wood sill plate is connected to

the ARXX wall with anchors bolts, which have been cast into the concrete.

It is recommended to recess the concrete by 1 (38 mm) at the top of the wall, allowing the sill plate to be set

down between the insulated panels, which maintains the full benefit of the insulation across the top of the wall (see

wall trowel, Figure 4.5-1).

FIGURE7.1.1-1 PLATFORMFRAMING

ANCHORBOLTSSHOULDBESIZEDANDSPACEDINACCORDANCEWITHLOCALBUILDINGCODEREQUIREMENTS.

EXTERIORAIRBARRIERORHOUSEWRAPSHOULDBEUSEDTOOVERLAPTHEARXX FORMSINORDERTOMAINTAINTHEAIR

SEAL. INTERIORVAPORBARRIERSHOULDBEOVERLAPPEDANDSEALEDOVERTHEWOODFRAMINGANDARXX FORMSBEHIND

THEWALLFINISH.

FLOORANDROOFSYSTEMSACTASTHELATERALSUPPORTFORTHETOPOFARXX WALLS.

7.0 FLOORANDROOFSYSTEMS


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1457.1 Wood Floor Connections

Masonry veneers will require additional surface bearing, directly on concrete. When using a masonry veneer, ARXX

Prime or ARXX Edge taper top forms, which are designed to extend the concrete width at the top of the wall, fulfill

the need for additional surface space. Since ARXX taper top forms require the concrete to be placed to the top of

the form, the sill plate should be set on a sill gasket.

FIGURE7.1.1-2 BRICKVENEER

7.1.2 GARAGEFLOORFOUNDATIONWALLS

The foundation wall for a garage is typically a frost wall that penetrates a few courses into the ground with a wood

framed wall on top. The sill plate for the stud wall for a garage must bear on concrete, so ARXX standard forms are

not recommended for the top course. ARXX Prime or ARXX Edge taper top forms are used to extend the concrete

for adequate bearing under the sill plate.

The garage slab, which is placed at a later date, may butt against the ARXX foundation wall. In forming the wall,

the interior foam may be removed to provide a finished concrete curb along the inside edge.

Refer to Stem Walls Section 5.5



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FIGURE7.1.2-1 GARAGEFOUNDATIONATFLOOR

THEARXX EDGETEEANCHORSHOULDBEUSEDTOSECURETEMPORARYWOODFORMINGTOARXX EDGEFORMWEBS.

CONNECTTHEFORMSTOTHETEEANCHORSWITHPLASTICZIP-TIESORTIE-WIRE.

See Section 1.1.7 for application of tie anchors.



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7.1.3 LEDGERBOARD(RIMJOIST) FLOORCONNECTIONASSEMBLIES

When using ARXX forms for the full wall height from the footings to underside of the roof, it is recommended to

install the wood or steel joist floor system to the side of the wall. A ledger board, or rim joist, installed on the inside

face of the wall requires the use of joist hangers or mechanical fasteners, for steel joists, to connect or hang the

floor joists from the ledger board.

When using the ledger board system for the floor system connections, the requirement for exact form coursing to

install the sill plates for the floor joist to bear on is eliminated.

THELEDGERBOARDMUSTBESECUREDTOTHECONCRETEWITHINTHEARXX FORM, ASITISNOTABLETOUSETHEWEBS

ORFASTENINGSTRIPSASTHEFINALSTRUCTURALCONNECTION.

There are two different ledger board attachment systems: anchor bolts and ledger connectors. Either of these

systems can be used when ARXX forms are used from the foundation wall to the roof. They may also be used for

main floor and second floor connections.

Ledger boards can be dimensional lumber, engineered lumber, laminated veneer lumber (LVL), or steel joists. The

size and material requirements for ledger boards are directly related to the floor joist systems and the floor loading

requirements.

ARXX WALLSMUSTBELATERALLYSUPPORTEDBYTHEFLOORSYSTEMORROOFSYSTEMALONGEVERYEXTERIORWALL.

7.1.4 ANCHORBOLTCONNECTIONSYSTEM

The design requirements for anchor bolts must be according to the building code, ARXX Prescriptive Design

Guide, or an engineers specifications for size, number, and spacing.

In order to achieve a solid to solid concrete connection when installing anchor bolts, the following steps are

required:

Tapered rectangular holes should be cut in the ARXX forms where the anchor bolts will go prior toconcrete placement. A temporary plywood form should be fabricated with the anchor bolts attached to cover the holes. The temporary form should then be secured to the fastening strips in the web.

Placing a temporary plywood form with the anchor bolts into the ARXX forms allows the concrete to extend to the

back face of the ledger board.

When installing the ledger board, care should be taken to not over-tighten anchor bolts before the concrete is

completely cured, as over-tightening can cause the bolt to separate from the green concrete. The nuts on the bolts

should only be tightened after the concrete has achieved adequate strength.

Refer to Figure 7.1.4-1 Ledger Board Connection with Anchor Bolts.



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FIGURE7.1.4-1 ANCHORBOLTLEDGERCONNECTION

ITISRECOMMENDEDTHATHOLESCUTFORANCHORBOLTSSHOULDBETAPEREDAT45,WHICHREDUCESTHEPOTENTIALFOR

FAILUREOFTHECONCRETEDUETOSHEAR.

ENGINEERINGDESIGNANDBUILDINGCODETAKE INTOACCOUNTBOTHLOADANDFLOORSPANWHENDETERMININGTHE

NUMBEROFBOLTSPERCONNECTION, BOLTDIAMETER (TYPICALLY1/2 (12.7 MM) OR5/8" (15.9 MM)), ANDBOLT

SPACING.

EITHERTREATEDLUMBERORAMOISTUREBARRIERBETWEENTHEREGULARLUMBERANDTHECONCRETESHOULDBEUSED.



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7.1.5 LEDGERCONNECTORSYSTEMS

Customized ledger connector systems have been developed for use with ICFs. The ledger connector system

engineered by Simpson Strong-Tie Company Inc. is compatible with ARXX forms and is recommended. This two

part system of galvanized connectors is easy to install and provides both vertical and lateral in-plane resistance. It

works for both wood and steel ledgers

The Simpson Strong-Tiesystem has three components:

ICFVL 14 gauge, galvanized connectors with legs that are embedded through the EPS panel intothe concrete ICFVL-W (for wood ledger), ICFVL-CW (for LVL ledger) 14 or 16 gauge galvanized exposed flangesthat provide the structural surface for mounting ledger boards screws 8-ICF D3 self-tapping screws

FIGURE7.1.5-1 LEDGERCONNECTORSYSTEM



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Simpson Strong-Tie system should be installed according to the manufacturers recommendations. The following

steps are generally used to install the system:

To install the ICFVL in the ARXX form, a chalk line should be snapped to mark the top of the ledgerboard. A second chalk line should be snapped measured down the depth of the ledger board.

The required on center spacing for the ICFVLs should be marked off. The ICFVL should be used to mark two cut lines for the legs of the ICFVL and then the cuts madeand the ICFVL inserted into the foam tightly. When installing wood ledgers greater than 10 (267 mm), the ICFVL should be installed on thebottom chalk line. When installing wood ledgers equal to or smaller than 10 (267 mm), the ICFVL

should be installed on the top chalk line.

When installing steel ledgers, the ICFVL should be installed centered on the ledger.

In all cases, the ICFVL should be installed so that the exposed plate is accessible for the top and

bottom screws, through the ICFVL-W or the ICFVL-CW and the ledger board.The holes provided in the embedded leg of the ICFVL permits the concrete to flow around it,anchoring the ICFVL securely within the concrete wall.

AFTERCONCRETEPLACEMENT, ALLICFVLSSHOULDBECHECKEDTOENSURETHEYARETIGHTTOTHEFACEOFTHEFORM

ANDHAVENOTMOVED.

THELEDGERCONNECTORSANDALEDGERBOARDMUSTBEINSTALLEDONALLEXTERIORWALLS, WHICHPROVIDESLATERAL

SUPPORTFORTHEARXX WALL. JOISTSRUNNINGPARALLELTOTHEWALLSHOULDBECONNECTEDBYBLOCKINGTOTHE

LEDGERBOARD.

THESPACINGOFTHEICFVL ISDEPENDANTONFLOORSPANSANDFLOORLOADING. REFERTOSIMPSONSTRONG-TIE

ENGINEERINGTABLESFORDESIGNSPECIFICATIONS.

7.1.5.2 Attaching Ledger Boards

Simpson Strong-Tie system should be installed and attached according to the manufacturers recommendations.

The following steps are generally used to attach the ledger board:

The ICFVL-W or ICFVL-CW should be slipped tightly underneath the wood ledger with the flangewith the pre-drilled holes exposed.

The eight self tapping screws should be partially attached into the ledger.

The ledger should be positioned level to the chalk line, tight against the wall, and the screws driven

through the wood into the plate of the ICFVL.

For steel ledgers, the ICFVL-W is not required. The steel ledger should be positioned up against the ICFVL andthe screws driven through the steel ledger into the ICFVL. All screws should be located at least (12.7 mm) from

the edge of the ICFVL and the screws spaced evenly.



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FIGURE7.1.5-2 LEDGERCONNECTORINSTALLATION

FIGURE7.1.5-3 LEDGERINSTALLLOCATIONS



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FIGURE7.1.5-4 LEDGERDETAIL

THEAPPLICATIONANDENGINEERINGSPECIFICATIONSFORTHESIMPSONSTRONG-TIE ICF LEDGERCONNECTORSYSTEMIS

INACCORDANCEWITHTHEMANUFACTURERSRECOMMENDATIONS ANDSPECIFICATIONS.

CARESHOULDBETAKENTOENSURETHATTHECONCRETEISCURED14 DAYSBEFORETHELEDGERCONNECTIONSARELOADEDWITHTHEFULLFLOORSYSTEM.



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7.1.6 EXTENDEDBRICKLEDGEFLOORSUPPORTASSEMBLIES

The ARXX Prime or ARXX Edge brick ledge forms may be installed to the inside of the wall as a support ledge for

floor systems. This will provide a 4 (100 mm) bearing surface. This system may be used for applications such as

top load bearing floor joists or trusses, open steel joists and crawl spaces with design criteria in accordance with

the building code criteria.

SINCETHEARXX PRIMEORARXX EDGEBRICKLEDGEFORMPROJECTSINTOTHEINTERIOROFTHEROOM, APPLYINGAN

INTERIORFINISHASTHETHERMALBARRIERMAYBEMOREDIFFICULTANDTHEAPPLICATIONSSUITETHEFORMBEINGUSEDIN

THESEINSTANCESWITHOUTATHERMALBARRIER.

FIGURE7.1.6-1 WOODFLOORTRUSSCONNECTION



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FIGURE7.1.6-2 CRAWLSPACE

THEBUILDINGCODEDOESNOTREQUIRESPECIFICCRAWLSPACEDESIGNSTOHAVEATHERMALBARRIER.

FLOORLOADSNEEDTOBECALCULATEDBYDESIGNTOENSURETHATLOADINGCONDITIONSDONOTEXCEEDTHESAFELOAD-

BEARINGCAPACITIESOFTHECONCRETELEDGEANDLOADECCENTRICITYONTHEWALL. THEARXX PRIMEANDARXX EDGE

BRICKLEDGELOADCAPACITYWITHSTIRRUPSAT8 (203 MM) O.C. IS1100 LBS/LIN.FT. (16 KN/M).

FLOORLOADSTHATEXCEEDTHEAPPLICABILITYLIMITSFORICFSINTHERESIDENTIALBUILDINGCODEREQUIREPROFESSIONAL

ENGINEERINGDESIGN INORDERTOENSURETHATTHEYFALLWITHINTHECAPABILITIESOFTHEARXX PRIMEORARXX

EDGEBRICKLEDGEFORM.



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1557.2 Floor Systems

7.2 FLOORSYSTEMS

In addition to conventional wood floor framing systems, ARXX ICFs are compatible with all other floor systems

generally used including OWSJ and steel decks, Hambro composite concrete floors, composite steel decks,

precast hollow core slabs, flat slab concrete and ICF deck systems. Some of these applications are detailed in this

section. Refer to the ARXX Detail Library for more floor system details.

ANYFLOORSYSTEMTHATEXCEEDSTHEDESIGNAPPLICABILITYLIMITSSPECIFIEDINTHEBUILDINGCODEMUSTBEDESIGNED

BYAPROFESSIONALENGINEER.

FLOORSYSTEMSMUSTHAVEASTRUCTURALCONNECTIONTOTHECONCRETETOPROVIDELATERALSUPPORTFORTHEWALL.

TOENSURENON-COMBUSTIBLECONSTRUCTION, THEFOAMPLASTICONTHE INTERIORSIDEOFEXTERIORWALLSMUSTBE

DISCONTINUEDATTHEFLOORLINES. WHENTHEFLOORSYSTEMINTERSECTSWITHTHEWALL, CONCRETEORFIREBLOCKING

SHOULD

BE

USED

TO

PREVENT

THE

PASSAGE

OF

FLAME

,SMOKE

,AND

HOT

GASES

FROM

ONE

FLOOR

TO

ANOTHER

.

7.2.1 CONCRETEFLOORS

Larger construction projects often require strong, thin floor structures that are non-combustible. Concrete is

therefore one of the more reasonable and common choices. Some of the various ways to construct concrete floors

are discussed in this section.

7.2.2 HAMBROCOMPOSITECONCRETEFLOORS

Hambro composite concrete floors are constructed using an open web steel joist (OWSJ) and sheets of plywood.

The OWSJ, which is unique to Hambro, spans from wall to wall and supports the plywood sheets. Concrete isplaced on top of the sheets and allowed to cure, at which time the plywood is removed, but the joists remain in

place as an integral part of the floor structure.

When a Hambro floor system is connected to an ARXX ICF wall, concrete should be placed to the bottom of

the proposed floor. After the concrete wall has attained adequate strength, the OWSJs and plywood should be

placed, as specified by Hambro and the engineers specifications.



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156 7.2 Floor Systems

FIGURE7.2.2-1 TYPICALHAMBROFLOORCONNECTION

7.2.3 COMPOSITESTEELDECK

Another method commonly used for constructing a poured-in-place concrete floor is to use a composite steel

deck. The deck spans from wall to wall, and depending on loading conditions, may have intermediate OWSJs. The

steel deck is corrugated, which allows less concrete to be used in the floor system, yet it is stronger than a floor

made of flat stock steel. The channels created beneath the corrugated floor are advantageous, because they allow

the routing of electrical wiring, plumbing, etc.

After the ARXX concrete walls have cured to adequate strength, the steel deck is set in place. Using a composite

steel deck will almost always require a structural engineering review.



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FIGURE7.2.3-1 TYPICALCOMPOSITEDECKFLOOR- PARALLELTOWALL

FIGURE7.2.3-2 TYPICALCOMPOSITEDECKFLOOR- PERPENDICULARTOWALL



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7.2.4 PRECASTCONCRETESLABS(HOLLOWCORE)

Concrete floors can be precast in a factory and set in place with a crane. The precast panels are self-supporting and

span from wall to wall without the need for intermediate supports, either from joists or other means.

After the concrete in the ARXX walls has reached adequate strength, the pre-cast concrete floor slabs can be set

in place on the wall. Once the concrete floor slabs are in place, a thin layer of grout can be laid over the slabs,

creating an even floor surface. Using precast concrete slabs will almost always require a structural engineering

review, which may be available directly from the manufacturer of the floor panels.

THEUSEOFARXX ICFSANDPRECASTCONCRETESLABSHASPROVENTOBEAVERYEFFICIENTSYSTEMINBUILDINGMULTI-

STORYBUILDINGS, SUCHASHOTELSANDCONDOS.

FIGURE7.2.4-1 TYPICALPRECASTDECKDETAIL- PARALLELTOWALL



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FIGURE7.2.4-2 TYPICALPRECASTDECKDETAIL- PERPENDICULARTOWALL

7.2.5 EPS DECKSYSTEMS

EPS deck systems are stay-in-place deck forming systems that are compatible with ICF wall systems. EPS deck

systems consist of interlocking rigid EPS panels, typically 24 or 48(610 mm or 1220 mm) wide, with embedded

steel C channels that act as structural support from bearing surface to bearing surface. The EPS deck panels are

designed to form the concrete floor slab with a structural T beam or concrete joist. Foam caps can be added to the

raised section of the floor panels for increased depth of the T beams for longer spans. Once the concrete deck has

cured, the EPS deck system remains in place to act as insulation for the floor assembly.

The embedded steel C channels provide a fastening surface for the ceiling finish attachments. The EPS can be

routed to allow for electrical wiring and/or plumbing to be contained within the ceiling below.

THEINSTALLATIONINSTRUCTIONSANDENGINEERINGFOREPS DECKSYSTEMSAREPROVIDEDBYTHEMANUFACTURER.

THE CONCRETE SLAB, STRUCTURAL JOIST, AND REINFORCEMENT FOR EPS DECK SYSTEMS MUST BE CONNECTED AND

SUPPORTEDBYTHECONCRETEINTHEARXX ICF WALLS.



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FIGURE7.2.5-1 EPS FLOORDECK- PARALLELTOWALL

FIGURE7.2.5-2 EPS FLOORDECK- PERPENDICULARTOWALL



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ARXX ICFs are compatible with all roof systems, regardless of whether they are pitched or flat, including:

conventional wood framing, engineered wood trusses, steel joists or trusses, precast slabs or poured concrete and

EPS deck systems.

There are various connection systems for each variety for roof system, although most are required to be cast into

the concrete. It is recommended to pre-plan the installation of all connection systems, as some applications may

require the ARXX form to be cut to accommodate embedded connectors.

LOCALBUILDINGCODESSHOULDBECHECKEDFORANYSPECIALCONNECTIONREQUIREMENTS, ESPECIALLYINHIGHWINDAND

SEISMICZONES.

DUETOTHEIRHIGHLOADBEARINGCAPACITY, ARXX ICF WALLSPROVIDETHECAPABILITYTODESIGNGREENROOFSYSTEMS

WITHOUTADDITIONALSTRUCTURALREQUIREMENTS.

TYPICALLY, ROOFSAND/ORCEILINGSHAVEANAIRANDVAPORBARRIERMEMBRANEASPARTOFTHEBUILDINGENVELOPE

DESIGN. THISSYSTEMMUSTBEMAINTAINEDANDINTEGRATEDINTOTHETOPOFTHEARXX WALLS.

THEBUILDINGCODEAPPLICABILITYLIMITSALLOWFORAMAXIMUMROOFCLEARSPANOF40 (12.2 M). ANYROOFSPAN

LARGERTHAN40 (12.2 M) REQUIRESTHEICF WALLSTOBEENGINEEREDTOACCOMMODATETHEADDITIONALLOADING.

FORLONGSPANSTEELJOISTSORRAFTERS, ARXX WALLSMAYBEDESIGNEDTOACCOMMODATETHEPOINTLOADS. SEE

SECTION5.6 COLUMNSANDPILASTERS.



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FIGURE7.3.2-1 TYPICALFLATROOFCONNECTION

7.3.3 GREENROOFS

Designing for a green roof system adds considerable structural loading to the overall building. ARXX ICFs are

reinforced concrete load bearing walls that can be engineered to accommodate the extra loading for green roof

systems.

THIS ISAN INHERENTVALUEOFBUILDINGWITHARXX ICFSTHATPROVIDESBENEFITTHROUGHHELPINGTOCONTRIBUTE

LEED POINTSFORGREENROOFSYSTEMS.


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