2018 IRC Update - IDABO€¦ · 2018 IRC Update © 2018 Colorado Code Consulting, LLC 3 R104.11...

© 2018 Colorado Code Consulting, LLC

2018 International Residential CodeUPDATE

2018 IRC Update

© 2018 Colorado Code Consulting, LLC 1


2018 International Residential CodeUPDATE Instructor

Steve Thomas, CBO

President, Colorado Code Consulting, LLC

Over 35 years experience in code administration and enforcement

ICC Means of Egress Code Committee

Author Building Code Basics, Commercial

(2009, 2012) Building Code Essentials (2015)


2


The Fine Print! There are times

when the code is vague.

You may get my opinion.

You have yours! AHJ makes final

determination

Today’s Discussion Significant Changes

in the IRC from the 2015- 2018 Editions

Excludes minor editorial changes

Overview of significant changes

Excludes electrical changes


2018 IRC Update



Solid Vertical Lines in MarginTechnical Change

ArrowEntire section, paragraph exception of table has been deleted.

Italicized TermsDefined term in the code.

* - Text or a table has been relocated within the code** - Text or table immediately following it has been relocated there from elsewhere in the code

Recommended Reading

6© 2018 Colorado Code Consulting, LLC


R101.2 ScopeThe provisions of the IRC shall apply to:Construction RepairAlteration EquipmentMovement Use and Occupancy Enlargement LocationReplacement Removal and Demolition

of detached one and two family dwellings and multiple single-family dwellings (townhouses) not more than 3 stories in height with a separate means of egress and their accessory structuresnot more than 3 stories in height.

R101.2 Scope (2018)Exception: The following shall be permitted to be constructed in accordance with this code where provided with a residential fire sprinkler system complying with Section P2904:1. Live/work units located in townhouses and complying with the requirements of Section 419 of the International Building Code.2. Owner-occupied lodging houses with five or fewer guestrooms.3. A care facility with five or fewer persons receiving custodial care within a dwelling unit.4. A care facility with five or fewer persons receiving medical care within a dwelling unit.5. A care facility for five or fewer persons receiving care that are within a single-family dwelling.


2018 IRC Update


R104.11 (2018)Alternative Materials, Design, and Methods of Construction and Equipment.Added new last sentence:Where the alternative material, design or method of construction is not approved, the building official shall respond in writing, stating the reasons the alternative was not approved.

© 2018 Colorado Code Consulting, LLC 9 © 2018 Colorado Code Consulting, LLC 10

Definitions - R202 (2018)

ADDITION. An extension or increase in floor area, number of stories or height of a building or structure.

Definitions - R202 (2018)ACCESS (TO) That which enables a device, an appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction.



ATTIC. The unfinished space between the ceilingassembly and the roof assembly

ATTIC, HABITABLE. A finished or unfinished habitable space within an attic


2018 IRC Update


Definitions - R202 (2018)CARBON MONOXIDE ALARM. A single- or multiple-station alarm intended to detect carbon monoxide gas and alert occupants by a distinct audible signal. It incorporates a sensor, control components and an alarm notification appliance in a single unit.



CARBON MONOXIDE DETECTOR.A device with an integral sensor to detect carbon monoxide gas and transmit an alarm signal to a connected alarm control unit.



CHANGE OF OCCUPANCY. A change in the use of a building or portion of a building that involves a change in the application of the requirements of this code.



CRAWL SPACE An underfloor space that is not a basement


2018 IRC Update



IMPACT PROTECTIVE SYSTEMConstruction that has been shown by testing to withstand the impact of test missiles and that is applied, attached, or locked over exterior glazing.



LOCKING-TYPE TAMPER-RESISTANT CAP.A cap designed to be unlocked by a specially designed tool or key to prevent removal of the cap by means of hand-loosening or by commonly available tool



READY ACCESS (TO). That which enables a device, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction.



VAPOR DIFFUSION PORTA passageway for conveying water vapor from an unvented attic to the outside atmosphere

Applies to new unvented roof assemblies in climate zones 1, 2 and 3


2018 IRC Update



BUILDING PLANNING CHAPTER 3


Design Criteria - Table R301.2(1)

l. In accordance with Figure R301.2(4)A, where there is local historical data documenting unusual wind conditions, the jurisdiction shall fill in this part of the table with “YES” and identify any specific requirements. Otherwise, the jurisdiction shall indicate “NO” in this part of the table.m. In accordance with Section R301.2.1.2.1, the jurisdiction shall indicate the wind-borne debris wind zone(s). Otherwise, the jurisdiction shall indicate “NO” in this part of the table.


Design Criteria - Table R301.2(1)

n. The jurisdiction shall fill in these sections of the table to establish the design criteria using Table 1a or 1b from ACCA Manual J or established criteria determined by the jurisdiction.Note: See Table 10A for altitude Correction FactorWind speeds are averages/system defaults during non-storm conditions

15 7.5 30% 45%-50%High (H)

70° 75°39° N 90°-3°

-32 to -48

0.84 73

R301.2.2.1Alternate Seismic Design Category


The seismic design categories and corresponding short-period design spectral response accelerations, SDS, shown in Figure R301.2(2), are based on soil Site Class D, used as an assumed default, as defined in Section 1613.2.2 of the International Building Code. If soil conditions are determined by the building official to be Site Class A, B, or D, the seismic design category and short-period design spectral response accelerations, SDS, for a site shall be allowed to be determined in accordance with Figure R301.2(3), or Section 1613.2 of the International Building Code.

2018 IRC Update


R301.2.2.6 Irregular buildings

The seismic provisions of this code shall not be used for structures, or portions thereof, located in Seismic Design Categories C, D0, D1 and D2 and considered to be irregular in accordance with this section.

A building or portion of a building shall be considered to be irregular where one or more of the conditions defined in Items 1 through 7 occur.

Must be engineered.


R302.1Exterior Walls

Construction, projections, openings and penetrations of exterior walls of dwellings and accessory buildings shall comply with Table R302.1(1); or dwellings equipped throughout with an automatic sprinkler system installed in accordance with Section P2904 shall comply with Table R302.1(2).


Table R302.1(1) new footnotes (2015)




1 hour—tested in accordance with ASTM E119, UL 263 or Section 703.3 of the International Building Code with exposure from both sides

2018 IRC Update




1 hour on the underside, or heavy timber, or fire-retardant-treated wood a, b

Table R302.1(2) revised footnotes (2018)


Table R302.1(2)Footnote: a

For residential subdivisions where all dwellings are equipped throughout with an automatic sprinkler systems installed in accordance with Section P2904, the fire separation distance for nonrated exterior walls and rated projections shall be permitted to be reduced to 0 feet, and unlimited unprotected openings and penetrations shall be permitted, where the adjoining lot provides an open setback yard that is 6 feet or more in width on the opposite side of the property line.


6 ft.

R302.2Townhouses (2018)

Walls separating townhouse units shall be constructed in accordance with Section R302.2.1 or R302.2.2.


2018 IRC Update


R302.2.1 Double walls (2018)

Each townhouse shall be separated by two 1-hour fire-resistance-rated wall assembliestested in accordance with ASTM E119, UL 263 or Section703.3 of the International Building Code.


R302.2.2Townhouses (2015/2018)

Common walls separating townhouses shall be assigned a fire-resistance rating in accordance with Section R302.2, Item 1 or 2. 1. Sprinklers = 1-hour 2. No Sprinklers = 2

hours 2018 added IBC section

703.3


R302.2.2Townhouses (2015/2018) The common wall shared by two townhouses shall be

constructed without plumbing or mechanical equipment, ducts or vents in the cavity of the common wall. The wall shall be rated for fire exposure from both sides and shall extend to and be tight against exterior walls and the underside of the roof sheathing


R302.4.2 Membrane penetrations (2018)

New exception:4. Ceiling membrane penetrations by listed luminaires or by luminaires protected with listed materials that have been tested for use in fire resistance-rated assemblies and are installed in accordance with the instructions included in the listing.


2018 IRC Update


R302.5.1 Opening protection

Openings from a private garage directly into a room used for sleeping purposes shall not be permitted.

Other openings between the garage and residence shall be equipped with solid wood doors not less than 1 3/8 inches in thickness, solid or honeycomb core steel doors not less than 1 3/8 inches thick, or 20-minute fire-rated doors, equipped with a self-closing or automatic-closing device.


R302.7 Under-stair protection (2018)

Enclosed space under stairs that is accessed by a door or access panel shall have walls, under-stair surface and any soffits protected on the enclosed side with 1/2-inch gypsum board


Flame spread index and smoke-developed indexfor insulation R302.10.1 Insulation (2018)

Insulating materials installed within floor-ceiling assemblies, roof-ceiling assemblies, wall assemblies, crawl spaces and attics shall comply with the requirements of this section. They shall exhibit a flame spread index not to exceed 25 and a smoke-developed index not to exceed 450 where tested in accordance with ASTM E84 or UL 723. Insulating materials, where tested in accordance with the requirements of this section, shall include facings, where used, such as vapor retarders, vapor permeable membranes and similar coverings.


R302.13 – Fire Protection of Floors (unchanged)

Non FR floorassemblies:

…shall be provided with ½” Gypsum Board 5/8” Wood Structural

Panel Or equivalent…

…on the underside of the floor framing member


2018 IRC Update


R302.13 – Fire Protection of Floors (2018)

Exception 2 Floor assemblies

located directly over a crawl space not intended for storage or fuel-fired equipment or electric-powered heating appliances


R308.4.2 Glazing adjacent to doors

Glazing in an individual fixed or operable panel adjacent to a door shall be considered to be a hazardous location where the bottom exposed edge of the glazing is less than 60 inches above the floor or walking surface and it meets either of the following conditions:


R308.4.2 Glazing adjacent to doors

1. Where the glazing is within 24 inches of either side of the door in the plane of the door in a closed position.


R308.4.2 Glazing adjacent to doors (2015/2018)

2. Where the glazing is on a wall is less than 180° from the plane of the door in a closed position and within 24 inches of the hinge side of an in-swinging door.


2018 IRC Update


R308.4.4.1 Structural glass baluster panels (2018)

Guards with structural glass baluster panels shall be installed with an attached top rail or handrail. The top rail or handrail shall be supported by not less than three glass baluster panels, or shall be otherwise supported to remain in place should one glass baluster panel fail.Exception: An attached top rail or handrail is not required where the glass baluster panels are laminated glass with two or more glass plies of equal thickness and of the same glass type.


R310.1 - Emergency escape and rescue opening required New Exception 2. Where the dwelling or townhouse is

equipped with an automatic sprinkler system installed in accordance with Section P2904, sleeping rooms in basements shall not be required to have emergency escape and rescue openings provided that the basement has one of the following: 2.1. One means of egress complying

with Section R311 and one emergency escape and rescue opening.

2.2. Two means of egress complying with Section R311.


R310.3Emergency Escape/Rescue Doors (2018)

Where a door is provided as the required emergency escape and rescue opening, it shall be permitted to be a side-hinged door or a slider

Where the opening is below the adjacent ground elevationgrade, it shall be provided with a bulkhead enclosure an area well.


R310.3.1 Minimum door opening size

The minimum net clear height opening for any door that serves as an emergency and escape rescue opening shall be in accordance with Section R310.2.1. (Egress openings)


2018 IRC Update


R310.3.2 Bulkhead Enclosures Area wells (2018)

Area wells shall have a width of not less than 36 inches. The area well shall be sized to allow the emergency escape and rescue door to be fully opened


R310.3.2.1 Ladders and steps (2018)

Required if area well greater than 44” deepNeed not comply with R311.7 or R311.8

(Stairways)Ladders or rungs

Inside ≥ 12”Project ≥ 3”Rung spacing ≤ 18”


R310.4 Bars, grilles, covers and screens

Bars, grilles, covers, screens or similar devices are permitted to be placed over emergency escape and rescue openings, bulkhead enclosures area wells, or window wells that serve such openings, provided: Minimum net clear opening size

complies with Sections R310.1.1 to R310.1.3,

Such devices are releasable or removable from the inside without the use of a key, tool, special knowledge or force greater than that which is required for normal operation of the escape and rescue opening.


R311.7.3 Vertical rise A flight of stairs shall

not have a vertical rise larger than 151inches between floor levels or landings.

Used to be 147 inches 10’ ceiling height +

floor trusses 20 X 7.55” = 151”


2018 IRC Update


R311.7.4 (2018)


R311.7.11 Alternating tread devices. (2018)

New exception:Alternating tread devices are allowed to be used as an element of a means of egress for lofts, mezzanines and similar areas of 200 gross square feet or less where such devices do not provide exclusive access to a kitchen or bathroom


R311.7.12 Ships ladders (2018)

New exception:Ships ladders are allowed to be used as an element of a means of egress for lofts, mezzanines and similar areas of 200 gross square feet or less that do not provide exclusive access to a kitchen or bathroom


R312Guards (2018)

Guards shall be located along provided for those portions of open-sided walking surfaces, including stairs, ramps and landings, that are located more than 30 inches measured vertically to the floor or grade below at any point within 36 inches horizontally to the edge of the open side.

Insect screening shall not be considered as a guard.


2018 IRC Update


R314.4 Interconnection (2018)Removed the exception:Interconnection of smoke alarms in existing areas shall not be required where alterations or repairs do not result in removal of interior wall or ceiling finishes exposing the structure, unless there is an attic, crawl space or basement available that could provide access for interconnection without the removal of interior finishes


Carbon Monoxcide Alarms R315.5 Interconnectivity (2018)

When more than one requiredShall be interconnected (same as Smoke Detectors)

Exception:Interconnection of carbon monoxcide alarms in existing areas shall not be required where alterations or repairs do not result in removal of interior wall or ceiling finishes exposing the structure, unless there is an attic, crawl space or basement available that could provide access for interconnection without the removal of interior finishes.


Flood Resistant Construction R322.3.4 Concrete slabs (2018)

Parking, landings, patio and similar uses shall be:Structurally independentFrangible/Break away (During Flood) Max 4” thick No reinforcement Control joints at 4’ O.C. ea direction

ORBe self supporting


Flood Resistant Construction R322.3.7 Stairways and ramps (2018)

Stairways and ramps that are located below the lowest floor elevations specified in Section R322.3.2 shall comply with one or more of the following:1. Be designed and constructed with open or partially open risers and guards.


2018 IRC Update



2. Stairways and ramps not part of the required means of egress shall be designed and constructed to break away during design flood conditions without causing damage to the building or structure, includingfoundation.



Be retractable, or able to be raised to or above the lowest floor elevation, provided that the ability to be retracted or raised prior to the onset of flooding is not contrary to the means of egress requirements of the code



Be designed and constructed to resist flood loads and minimize transfer of flood loads to the building or structure, including foundation


Flood Resistant Construction R322.3.8 Decks and porches (2018)

Shall either meet the foundation requirements of this section orShall be cantilevered from or knee braced to the building or structureSelf-supporting decks and porches that are below the base flood elevation shall not be enclosed by solid, rigid walls, including walls designed to break awaySelf-supporting decks and porches shall be designed and constructed to remain in place during base flood conditions or shall be frangible


2018 IRC Update



324Solar energy systems

Solar energy systems shall comply with the provisions of this section


R324.4 Rooftop-mounted photovoltaic systems

Rooftop-mounted photovoltaic panel systems installed on or above the roof covering shall be designed and installed in accordance with Section R907 this section.


R324.4.1 Roof Live Load (2018)Portions of roof structures not covered with photovoltaic panel systems shall be designed for dead loads and roof loads in accordance with Sections R301.4 and R301.6. Portions of roof structures covered with photovoltaic panel systems shall be designed for the following load cases:1. Dead load (including photovoltaic panel weight) plus snow load in accordance with Table R301.2(1).2.Dead load (excluding photovoltaic panel weight) plus roof live load or snow load, whichever is greater, in accordance with Section R301.6.

R324.6 Access and pathways Roof access,

pathways and spacing requirements shall be provided in accordance with Sections R324.6.1 through R324.7.1


2018 IRC Update


R324.6 Roof access and pathways(2018)

Shall be providedExceptions:1. Detached non-habitable structures, carports, detached garages2. AHJ determined no roof top operations3. Roof pitch 2/12 and less


R324.6.1 Pathways (2018)Two pathways, on separate roof planes from lowest roof edge to ridge and not less than 36 inches wideOne pathway shall be provided on the street or driveway side of the roofEach roof plane with a photovoltaic array:Pathway not less than 36 inches wide shall be provided from the lowest roof edge to ridge on the same roof plane as the photovoltaic array, on an adjacent roof plane, or straddling the same and adjacent roof planes.Pathways shall be over areas capable of supporting fire fighters accessing the roof. Pathways shall be located in areas with minimal obstructions such as vent pipes, conduit, or mechanical equipment



R324.6.2.2 Emergency escape and rescue opening (2018)Panels and modules installed on dwellings shall not be placed on the portion of a roof that is below an emergency escape and rescue opening. A pathway not less than 36 inches wide shall be provided to the emergency escape and rescue opening


2018 IRC Update


R325.3 Area limitation (2015) The aggregate area of a

mezzanine or mezzanines shall be not greater than one-third of the floor area of the room or space in which they are located

The enclosed portion of a room shall not be included in a determination of the floor area of the room in which the mezzanine is located


MezzaninesR325.3 Area limitation (2018)

New exception:With fire suppression can be ½ the floor area of the room provided all are met: Except for enclosed closets and

bathrooms, the mezzanine is open to the room in which such mezzanine is located.

The opening to the room is unobstructed except for walls not more than 42 inches in height, columns and posts

The exceptions to Section R325.5 are not applied


R325.4 Means of egress (2015/2018)

The means of egress for mezzanines shall comply with the applicable provisions of Section R311

2018 now allows ships ladders and alternating tread devises for areas up to 200 sq. ft.


R325.6 Habitable attic (2018)A habitable attic shall not be considered a story where complying with all of the following requirements:

1. The occupiable floor area is not less than 70 square feet, in accordance with Section R3042. The occupiable floor area has a ceiling height in accordance with Section R3053. The occupiable space is enclosed by the roof assembly above, knee walls (if applicable) on the sides and the floor-ceiling assembly below4. The floor of the occupiable space shall not extend beyond the exterior walls of the floor below


2018 IRC Update


R327 Stationary storage battery systems (2018)

Listed and labeled for residential use in accordancewith UL 9540.



Exceptions:Where approved, repurposed unlisted battery systems from electric vehicles are allowed to be installed outdoors or in detached sheds located not less than 5 feet from exterior walls, property lines and public ways



Exceptions:Battery systems that are an integral part of an electric vehicle are allowed provided that the installation complies with Section 625.48 of NFPA 70



Exceptions:Battery systems less than 1 kWh


2018 IRC Update


R327.3 Installation (2018)Stationary storage battery systems shall be installed in accordance with the manufacturer’s instructions and their listing, if applicable, and shall not be installed within the habitable space of a dwelling unit


R327.4 Electrical installation (2018)

Storage systems in accordance with NFPA 70Inverters shall be listed and labeled in accordance with UL 1741 or provided as part of the UL 9540 listing Systems connected to the utility grid shall use inverters listed for utility interaction.


R327.5 Ventilation (2018)

Indoor installations of stationary storage battery systems that include batteries that produce hydrogen or other flammable gases during charging shall be provided with ventilation in accordance with Section M1307.4.


FOUNDATIONS – Chapter 4

2018 IRC Update



R408.3 Unvented crawl space

Provisions for elimination of ventilation openings for crawl and under floor spaces. Mechanical exhaust Condition space Under-floor plenum


R408.3 Unvented crawl space

New option in 2018:2.4. Dehumidification sized to provide 70 pints of moisture removal per day for every1,000 square feet of crawl space floor area

FLOORS – Chapter 5


Chapter 5Floors

Wood Floor Framing Pressure

Preservative Treated-Wood Floors

Steel Floor Framing Concrete

2018 IRC Update


R507.1 DecksWood-framed decks shall be in accordance with this section. For decks using materials and conditions not prescribed in this section, refer to Section R301

Section reorganized. © 2018 Colorado Code Consulting, LLC 89

R507.2.1 Wood materials (2018)

Wood materials shall be No. 2 grade or better lumber, preservative-treated in accordance with Section R317, or approved, naturally durable lumber, and termite protected where required All preservative-treated wood products in contact with the ground shall be labeled for such usage


R507.2.3 Fasteners and connectors (2018 new table)


Table R507.2.3 (2018 footnotes)

a. Equivalent materials, coatings and finishes shall be permitted.b. Fasteners and connectors exposed to salt water or located within 300 feet of a salt water shoreline shall be stainless steel.c. Holes for bolts shall be drilled a minimum 1/32 inch and a maximum 1/16 inch larger than the bolt.d. Lag screws 1/2 inch and larger shall be predrilled to avoid wood splitting per the National Design Specification (NDS) for Wood Construction.e. Stainless-steel-driven fasteners shall be in accordance with ASTM F1667.


2018 IRC Update


R507.3 Footings (2018)Decks shall be supported on concrete footings or other approved structural systemsDeck footings shall be sized to carry the imposed loads from the deck structure to the ground as shown in Figure R507.3. The footing depth shall be in accordance with Section R403.1.4.


R507.3.2 Footings (2018)

Deck footings shall extend below the frost line specified in Table R301.2(1) in accordance with Section R403.1.4.1.Exceptions:1.Free-standing decks that meet all of the following criteria:

1.1. The joists bear directly on precast concrete pier blocks at grade without support by beams or posts.1.2. The area of the deck does not exceed 200 square feet1.3. The walking surface is not more than 20 inches above grade at any point within 36 inches measured horizontally from the edge.

2. Free-standing decks need not be provided with footings that extend below the frost line.


Figure R507.3 (2018)


R507.3.1 Minimum size (2018)The minimum size of concrete footings shall be in accordance with Table R507.3.1, based on the tributary area and allowable soil-bearing pressure in accordance with Table R401.4.1.


2018 IRC Update


R507.2.1 Ledger Details (2018 R507.9.11)

Deck ledgers installed in accordance with Section R507.2 shall be a minimum 2-inch by 8-inch nominal, pressure-preservative-treated southern pine, incised pressure-preservative-treated Hem-fir, or approved, naturally durable, No. 2 grade or bet-ter lumber. Deck ledgers installed in accordance with Section R507.2 Shall not support concentrated loads from beams or girders. Deck ledgers shall not be supported on stone or masonry veneer © 2018 Colorado Code Consulting, LLC 97

R507.2.2 Band joist details(2018 R507.9.1.2)

Band joists attached by a ledger in accordance with Section R507.2 shall be a minimum 2-inch-nominal, solid-sawn, spruce-pine-fir lumber or a minimum 1-inch by 9 1/2-inch dimensional, Douglas fir or better, laminated veneer lumber. Band joists attached by a ledger in accordance with Section R507.2 shall be fully supported by a wall or sill plate belowBand joists shall bear fully on the primary structure capable of supporting all required loads.


R507.2.3 Ledger to band joist fastener details(2018 R507.9.1.3) No content change

Fasteners used in deck ledger connections in accordance with Table R507.2 shall be hot-dipped galvanized or stainless steel and shall be installed in accordance with Table R507.2.1 and Figures R507.2.1(1) and R507.2.1(2)


TABLE R507.2 (R507.9.1.3(1) 2018)No change to table


2018 IRC Update


R507.9.1.3(1) 2018 No change


R507.9.1.3(2) 2018 No change

R507.2.4 Deck lateral load connection (R507.9.2 2018)

The lateral load connection required by Section R507.1 shall be permitted to be in accordance with Figure R507.2.3(1) or R507.2.3(2). Lateral loads shall be transferred to the ground or to a structure capable of transmitting them to the ground.Where the lateral load connection is provided in accordance with Figure R507.2.3(1) Figure R507.9.2(1), hold-down tension devices shall be installed in not less than two locations per deck, within 24 inches of each end of the deck. Each device shall have an allowable stress design capacity of not less than 1,500 pounds. Where the lateral load connections are provided in accordance with Figure R507.2.3(2) R507.9.2(2), the hold-down tension devices shall be installed in not less than four locations per deck, and each device shall have an allowable stress design capacity of not less than 750 pounds


FIGURE 507.9.2(1) (2018 No change)


2018 IRC Update


105

FIGURE 507.9.2(2) (2018 No change)


R507.4 Decking (R507.7 2018)Maximum allowable spacing for joists supporting decking shall be in accordance with Table R507.7. Wood decking shall be attached to each supporting member with not less than (2) 8d threaded nails or (2) No. 8 wood screws. Other approved decking or fastener systems shall be installed in accordance with the manufacturer’s installation requirements.


2018 minor changes to table

R507.5 Deck joists (R507.6 2018)

Maximum allowable spans for wood deck joists, as shown in Figure R507.6, shall be in accordance with Table R507.6. Deck joists shall be permitted to cantilever not greater than one-fourth of the actual, adjacent joist span.


2018 IRC Update


New for 2018


R507.5.1 Lateral Restraint at Supports (R507.6.2 2018)

Joist ends and bearing locations shall be provided with lateral restraint to prevent rotation. Where lateral restraint is provided by joist hangers or blocking between joists, their depth shall equal not less than 60 percent of the joist depth. Where lateral restraint is provided by rim joists, they shall be secured to the end of each joist with not less than (3) 10d (3 inch by 0.128 inch) nails or (3) No. 10 by 3 inch long wood screws.


No content changes for 2018

R507.5.1 Deck beam bearing (2018)The ends of beams shall have not less than 1 1/2 inches of bearing on wood or metal and not less than 3 inches of bearing on concrete or masonry for the entire width of the beam.Where multiple-span beams bear on intermediate posts, each ply must have full bearing on the post in accordance with Figures R507.5.1(1) and R507.5.1(2)


New for 2018


2018 IRC Update


New for 2018


R507.6 Deck Beams (R507.5 2018)Maximum allowable spans for wood deck beams, as shown in Figure R507.5, shall be in accordance with Table R507.5.Beam plies shall be fastened with two rows of 10d (3 inch by 0.128 inch) nails minimum at 16 inches on center along each edge. Beams shall be permitted to cantilever at each end up to one-fourth of the actual beam span. Splices of multi-span beams shall be located at interior post locations. Deck beams of other materials shall be permitted where designed in accordance with accepted engineering practice



R507.7.1 Deck beam connection to supports (R507.5.2 2018)

Deck beams shall be attached to supports in a manner capable of transferring vertical loads and resisting horizontal displacement. Deck beam connections to wood posts shall bein accordance with Figures R507.5.1(1) and R507.5.1(2).Manufactured post-to-beam connectors shall be sized for the post and beam sizes. All bolts shall have washers under the head and nut.Exception: Where deck beams bear directly on footings in accordance with Section R507.8.1. © 2018 Colorado Code Consulting, LLC 116

2018 IRC Update


R507.8 Deck posts (R507.4 2018)For single-level, wood-framed decks with beams sized in accordance with Table R507.5, deck post size shall be in accordance with Table R507.4


New table for 2018

R507.8.1 Deck post to deck footing (R507.4.1 2018)

Posts shall bear on footings in accordance with Section R403 and Figure R507.8.1. Posts shall be restrained to prevent lateral displacement at the bottom support. Such Where posts bear on concrete footings in accordance with Section R403 and Figure R507.4.1, lateral restraint shall be provided by manufactured connectors installed in accordance with Section R507 and the manufacturers’ instructions or a minimum post embedment of 12 inches in surrounding soils or concrete piers. Other footing systems shall be permitted

Exception: Where expansive, compressible, shifting or other questionable soils are present, surrounding soils shall not be relied on for lateral support



WALL CONSTRUCTIONCHAPTER 6

R602.3.1 Stud Size, height, and Spacing (2018)

The size, height, and spacing of studs shall be in accordance with Table R602.3(5)New exception:Exterior load-bearing studs not exceeding 12 feet in height provided in accordance with Table R602.3(6). The minimum number of full-height studs adjacent to openings shall be in accordance with Section R602.7.5. The building shall be in Exposure B, the roof live load shall not exceed 20 psf, and the ground snow load shall not exceed 30 psf. Studs and plates shall be No. 2 grade lumber or better


2018 IRC Update


Add new table R603.3(6)


Girder SpansTable R502.5 R602.7.1 (Updated for 2018)

Exterior header for 7’6” openingsupporting roof/ceiling


WALL COVERING CHAPTER 7

R703.2 Water-resistive barrier (2018)

Added Other approved materials shall be installed in accordance with the water-resistive barrier manufacturer’s installation instructionsRemovedThe water-resistive barrier is not required for detached accessory buildings


2018 IRC Update


R703.3.1 Soffit installation Soffits shall comply

with Section R703.3.1.1, Section R703.3.1.2 or the manufacturer’s installation instructions.


R703.3.1.1 Wood structural panel soffit The minimum nominal

thickness for wood structural panel soffits shall be 3/8 inch and shall be fastened to framing or nailing strips with 2-inch by 0.099-inch nails.

Fasteners shall be in spaced not less than 6 inches on center at panel edges and 12 inches on center at intermediate supports.


R703.3.1.2 Vinyl soffit panels

Soffit panels shall be fastened at fascia and wall ends and to intermediate nailing strips as necessary to ensure that there is no unsupported span greater than 16 inches, or as specified by the manufacturer’s instructions.


R703.7 Exterior plaster (stucco)(2018)

R703.7.1 LathNew exception in 2018:Lath is not required over masonry, cast-in-place concrete, precast concrete or stone substrates pre-pared in accordance with ASTM C1063


2018 IRC Update


Anchored stone and masonry veneer (2018)

R703.8.4 Anchorage. Masonry veneer shall be anchored to the supporting wall studs with corrosion-resistant metal ties embedded in mortar or grout and extending into the veneer a minimum of 1 1/2 inches, with not less than 5/8-inch mortar or grout cover to outside face. Masonry veneer shall conform to Table R703.8.4(1). For masonry veneer tie attachment through insulating sheathing not greater than 2 inches (51 mm) in thickness to not less than 7/16 performance category wood structural panel, see Table R703.8.4(2)


TABLE R703.8.4(1) TIE ATTACHMENT AND AIRSPACE REQUIREMENTS

New footnote c. An airspace that

provides drainage shall be permitted to contain mortar from construction.


Polypropylene siding (2018)


R703.14.3 Flame spread index. The certification of the flame spread index shall be accompanied by a test report stating that all portions of the test specimen ahead of the flame front remained in position during the test in accor-dance with ASTM E84 or UL 723

2018 IRC Update


R703.11.2 - Installation over foam plastic sheathing Where vinyl siding or insulated vinyl

siding is installed over foam plastic sheathing, the vinyl siding shall comply with Section R703.11 and shall have a design wind pressure resistance in accordance with Table R703.11.2.

Exceptions: 1.Where the foam plastic sheathing

is applied directly over wood structural panels, fiberboard, gypsum sheathing or other approved backing capable of independently resisting the design wind pressure, the vinyl siding shall be installed in accordance with Sections R703.3.3 and R703.11.1.


R703.11.2 - Installation over foam plastic sheathing

New Exceptions 2. Where the vinyl siding

manufacturer’s product specifications provide an approved design wind pressure rating for installation over foam plastic sheathing, use of this design wind pressure rating shall be permitted and the siding shall be installed in accordance with the manufacturer’s installation instructions.

3. Where the foam plastic sheathing and its attachment have a design wind pressure resistance complying with Sections R316.8 and R301.2.1, the vinyl siding shall be installed in accordance with Sections R703.3.3 and R703.11.1.


Chapter 8 Roof-Ceiling Construction

2018 IRC Update


R802 Wood roof framingR802.1.8 Prefabricated wood I-joists (2018)Structural capacities and design provisions for prefabricated wood I-joists shall be established and monitored in accordance with ASTM D5055


R802.2 Design and construction (2018)

The framing details required in Section R802 apply to roofs having a minimum slope of three units vertical in 12 units horizontal (25-percent slope) or greater.The roof and ceiling assembly shall provide continuous ties across the structure to prevent roof thrust from being applied to the supporting walls. The assembly shall be designed and constructed in accordance with the provisions of this chapter and Figures R606.11(1), R606.11(2) and R606.11(3) or in accordance with AWC NDS. Components of roof-ceilings shall be fastened in accordance with Table R602.3(1).


R802.3 Framing details RidgeAdded text in 2018:Where ceiling joist or rafter ties do not provide continuous ties across the structure, a ridge beam shall be provided and supported on each end by a wall or girder


Wood Structural Panel (2018)R803.2.3 Installation Wood structural panel used as roof sheathing shall be installed with joints staggered or not staggered in accordance with Table R602.3(1), APA E30 for wood roof framing or with Table R804.3 for cold-formed steel roof framing. Wood structural panel roof sheathing in accordance with Table R503.2.1.1(1) shall not cantilever more than 9 inches beyond the gable endwall unless supported by gable overhang framing


2018 IRC Update


R806.2 Minimum vent area (2018)The minimum net free ventilating area shall be 1/ 150 of the area of the vented space. Exception: The minimum net free ventilation area shall be 1/300 of the vented space provided one or more both of the following conditions are met: 1. In Climate Zones 6, 7 and 8, a Class I or II vapor retarder is installed on the warm-in-winter side of the ceiling. 2. Not less than 40 percent and not more than 50 percent of the required ventilating area is provided by ventilators located in the upper portion of the attic or rafter space. Upper ventilators shall be located not more than 3 feet (914 mm) below the ridge or highest point of the space, measured vertically, with the balance of the required ventilation provided by eave or cornice vents shall be located in the bottom 1/3 of the attic space. Where the location of wall or roof framing members conflicts with the installation of upper ventilators, installation more than 3 feet (914 mm) below the ridge or highest point of the space shall be permitted.


R806.5 Unvented attic and unvented enclosed rafter assemblies

Must be within the building thermal envelope.

No interior class I vapor retarders on ceiling side

Wood shingles/shakes – ¼ inch air between sheathing

Air-impermeable insulation on underside of roof deck (Climate Zones 5, 6, 7, and 8) and shall be a class II vapor retarder or coating


Insulation shall be located in accordance with the following:

5.1.1. Where only air-impermeable insulation is provided, it shall be applied in direct contact with the underside of the structural roof sheathing.



5.1.2. Where air-permeable insulation is provided inside the building thermal envelope, it shall be installed in accordance with Section 5.1.1. In addition to the air-permeable insulation installed directly below the structural sheathing, rigid board or sheet insulation shall be installed directly above the structural roof sheathing in accordance with the R-values in Table R806.5 for condensation control.


2018 IRC Update



5.1.3. Where both air-impermeable and air-permeable insulation are provided, the air-impermeable insulation shall be applied in direct contact with the under-side of the structural roof sheathing in accordance with Item 5.1.1 and shall be in accordance with the R-values in Table R806.5 for condensation control. The air-permeable insulation shall be installed directly under the air-impermeable insulation.



Either Items 5.1, 5.2 or 5.3 shall be met, depending on the air permeability of the insulation directly under the structural roof sheathing.


R806.5 Unvented attic and unvented enclosed rafter assemblies (2018)

5.2 In Climate Zones 1, 2 and 3, air-permeableinsulation installed in unvented attics shall meetthe following requirements:


5.2.1. An approved vapor diffusion port shall be installed not more than 12 inches from the highest point of the roof, measured vertically from the highest point of the roof to the lower edge of the port.


5.2.2. The port area shall be greater than or equal to 1:600 of the ceiling area. Where there are multiple ports in the attic, the sum of the port areas shall be greater than or equal to the area requirement.


5.2.3. The vapor-permeable membrane in the vapor diffusion port shall have a vapor permeance rating of greater than or equal to 20 perms when tested in accordance with Procedure A of ASTM E96.

2018 IRC Update



5.2.4. The vapor diffusion port shall serve as an air barrier between the attic and the exterior of the building.

5.2.5. The vapor diffusion port shall protect the attic against the entrance of rain and snow.


5.2.6. Framing members and blocking shall not block the free flow of water vapor to the port. Not less than a 2-inch space shall be provided between any blocking and the roof sheathing. Air-permeable insulation shall be permitted within that space


5.2.7. The roof slope shall be greater than or equal to 3:12 (vertical/horizontal)

5.2.8. Where only air-permeable insulation is used, it shall be installed directly below the structural roof sheathing


5.2.9. Air-impermeable insulation, if any, shall be directly above or below the structural roof sheathing and is not required to meet the R-value in Table 806.5. Where directly below the structural roof sheathing, there shall be no space between the air-impermeable insulation and air-permeable insulation


5.2.10. The air shall be supplied at a flow rate greater than or equal to 50 CFM per 1,000 square feet of ceiling. The air shall be supplied from ductwork providing supply air to the occupiable space when the conditioning system is operating. Alternatively, the air shall be supplied by a supply fan when the conditioning system is operating.



https://buildingscience.com/documents/insights/bsi-088-venting-vaporLink to Building Science article explains in detail the unvented attic assemblies in climate zones 1, 2 and 3


2018 IRC Update


ROOF ASSEMBLIESCHAPTER 9


R905.17 Building-integrated Photovoltaic (BIPV) roof panels applied directly to the roof deck

The installation of BIPV roof panels shall comply with the provisions of this section, Section R324 and NFPA 70.


R905.17.1 Deck requirements

BIPV roof panels shall be applied to a solid or closely-fitted deck, except where the roof covering is specifically designed to be applied over spaced sheathing.


R905.17.2 Deck slope BIPV roof panels shall be used only on roof

slopes of two units vertical in 12 units horizontal or greater.


2018 IRC Update


R905.17.3 Underlayment

Underlayment shall comply with Section 905.1.1.

Where required, an ice barrier shall comply with Section R905.1.2.


R905.17.4 Ice barrier

In areas where there has been a history of ice forming along the eaves causing a backup of water, as designated in Table R301.2(1), an ice barrier that consists of not less than two layers of underlayment cemented together or of a self-adhering polymer-modified bitumen sheet shall be used in lieu of normal underlayment and extend from the lowest edges of all roof surfaces to a point not less than 24 inches inside the exterior wall line of the building. Exception: Detached accessory structures

that do not contain conditioned floor area.


R905.17.5 Material standards

BIPV roof panels shall be listed and labeled in accordance with UL 1703.


R905.17.6 Attachment BIPV roof panels

shall be attached in accordance with the manufacturer’s installation instructions.


2018 IRC Update


R905.17.7 Wind resistance

BIPV roof panels shall be tested in accordance with UL 1897. BIPV roof panel packaging shall bear a label to indicate compliance with UL 1897.


CHAPTER 10CHIMNEYS AND FIREPLACES


R1005.8 Insulation shield

Where factory-built chimneys pass through insulated assemblies, an insulation shield constructed of steel having a thickness of not less than 0.0187 inch (No. 26 gage) shall be installed to provide clearance between the chimney and the insulation material.

The clearance shall be not less than the clearance to combustibles specified by the chimney manufacturer’s installation instructions.

Where chimneys pass through attic space, the shield shall terminate not less than 2 inches above the insulation materials and shall be secured in place to prevent displacement.

Insulation shields provided as part of a listed chimney system shall be installed in accordance with the manufacturer’s installation instructions.


ENERGY EFFICIENCYCHAPTER 11

The text of the following Sections N1101.2 through N1105 is extracted from the 2018 edition of the International Energy Conservation Code—Residential Provisions and has been editorially revised to conform to the scope and application of this code.

The section numbers appearing in parenthesis after each section number are the section numbers of the corresponding text in the International Energy Conservation Code—Residential Provisions.

2018 IRC Update


N1101.6 (R202) Defined terms AIR BARRIER. One or more

materials joined together in a continuous manner to restrict or prevent the passage of air through the building thermal envelope and its assemblies.


N1101.6 (R202) Defined terms BUILDING THERMAL

ENVELOPE. The basement walls, exterior walls, floors, ceilings, roofs and any other building element assemblies that enclose conditioned space or provide a boundary between conditioned space and exempt or unconditioned space.


N1102.1 (R402.1) General (Prescriptive)

The building thermal envelope shall comply with the requirements of SectionsN1102.1.1 through N1102.1.5.New exception in 2018:2. Log homes designed in accordance with ICC 400-2017


N1101.14 (R401.3) Certificate (mandatory).

A permanent certificate shall be completed by the builder or registered design professional and posted on or in the electrical distribution panel a wall in the space where the furnace is located, a utility room, or an approved location inside the building by the builder or registered design professional. Where located on an electrical panel, the certificate shall not cover or obstruct the visibility of the circuit directory label, service disconnect label, or other required labels……..


2018 IRC Update



N1102.1.2U-Factor Alternative

An assembly with a U -factor equal to or less than that specified in Table N1102.1.2 shall be permitted as an alternative to the R -value in Table N1102.1.1.


Table N1102.4.1.1(R402.4.1.1)

Recessed light fixtures installed in the building thermal envelope shall be sealed to the finished surface.

Recessed light fixtures installed in the building thermal envelope shall be air tight and IC rated.

171

Table N1102.4.1.1(R402.4.1.1)

HVAC supply and return register boots that penetrate building thermal envelope shall be sealed to the subfloor, wall covering or ceiling penetrated by the boot.

172

2018 IRC Update


N1103.3.6 (R403.3.6) Ducts buried within ceiling insulation (2018)

Where supply and return air ducts are partially or completely buried in ceiling insulation, such ducts shall comply with all of the following:1. The supply and return duct shall have an insulation R-value not less than R-8.2. At all points along each duct, the sum of the ceiling insulation R-values against and above the top of the duct, and against and below the bottom of the duct shall be not less than R-19, excluding the R-value of the duct insulation


N1103.3.6 (R403.3.6) Ducts buried within ceiling insulation

3. In Climate Zones 1A, 2A and 3A, the supply ducts shall be completely buried within ceiling insulation, insulated to an R-value of not less than R-13 and in compliance with the vapor retarder requirements of Section M1601.4.6

Exception: Sections of the supply duct that are less than 3 feet from the supply outlet shall not be required to comply with these requirements.


N1103.3.6.1 (R403.3.6.1) Effective R-value of deeply buried ducts

Where using a simulated energy performance analysis, sections of ducts that are installed in accordance with Section N1103.3.6, located directly on, or within 5.5 inches of the ceiling, surrounded with blown-in attic insulation having an R-value of R-30 or greater and located such that the top of the duct is not less than 3.5 inches below the top of the insulation, shall be considered as having an effective duct insulation R-value of R-25


N1103.3.7 (R403.3.7) Ducts located in conditioned space (2018)

For ducts to be considered as inside a conditioned space, such ducts shall comply with either of the following:

1.The duct system is located completely within the continuous air barrier and within the building thermal envelope


2018 IRC Update



2. The ducts are buried within ceiling insulation in accordance with Section N1103.3.6 and all of the following conditions exist:

2.1 The air handler is located completely within the continuous air barrier and within the building thermal envelope



2.2. The duct leakage, as measured either by a rough-in test of the ducts or a post-construction total system leakage test to outside the building thermal envelope in accordance with Section N1103.3.4, is less than or equal to 1.5 cubic feet per minute per 100 square feet of conditioned floor area served by the duct system



2.3. The ceiling insulation R-value installed against and above the insulated duct is greater than or equal to the proposed ceiling insulation R-value, less the R-value of the insulation on the duct.


N1104Lighting Systems – Lamps (2018)

A minimum of 75 percent of the lamps in permanently installed lighting fixtures shall be high-efficacy lamps or a minimum of 75 percent of the permanently installed lighting fixtures shall contain only high-efficacy lampsN1104.1 (R404.1) Lighting equipment (Mandatory).Not less than 90 percent of the permanently installed lighting fixturesshall contain only high-efficacy lamps.


2018 IRC Update


R406.3 Energy Rating Index


The Energy Rating Index (ERI) shall be a numerical integer value that is based on a linear scale constructed such that the ERI reference design has an Index value of 100 and a residential building that uses no net purchased energy has an Index value of 0. Each integer value on the scale shall represent a 1-percent change in the total energy use of the rated design relative to the total energy use of the ERI reference design. The ERI shall consider all energy used in the residential building.


183

TABLE R406.4MAXIMUM ENERGY RATING INDEX

© 2018 Colorado Code Consulting, LLC © 2018 Colorado Code Consulting, LLC 184

MECHANICALPART V

Administration General Requirements Heating & Cooling Exhaust Systems Duct Systems Combustion Air Chimney & Vents Special Equipment Boilers/Water Heaters Special Piping Solar Systems

2018 IRC Update


M1305.1.4.2 ExcavationsPit locations

Appliances installed in pits or excavations shall not come in direct contact with the surrounding soil and shall be installed not less than 3 inches above the pit floor. The sides of the pit or excavation shall be held back not less than 12 inches from the appliance. Where the depth exceeds 12 inches below adjoining grade, the walls of the pit or excavation shall be lined with concrete or masonry. Such concrete or masonry shall extend not less than 4 inches above adjoining grade and shall have sufficient lateral load-bearing capacity to resist collapse. Excavation on the control side of the appliance shall extend horizontally not less than 30 inches. The appliance shall be protected from flooding in an approved manner.


Clothes dryer exhaustNew section 2018M1502.3.1 Exhaust termination outlet and passageway size.

The passageway of dryer exhaust duct terminals shall be undiminished in size and shall provide an open area of not less than 12.5 square inches


Area minimum 12.5 sq. in. (4” duct)5” duct = 19.6 sq. in.6” duct = 28. sq. in.

M1502.4.2 Duct installation

Sentence added 2018Where dryer exhaust ducts are enclosed in wall or ceiling cavities, such cavities shall allow the installation of the duct without deformation.


M1503.4 Makeup air requiredM1503.6 in 2018

2012 IRC Exhaust hood systems capable of exhausting in excess of 400 cubic feet per minute shall be mechanically or naturally provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with a means of closure and shall be automatically controlled to start and operate simultaneously with the exhaust system not less than one damper. Each damper shall be a gravity damper or an electrically operated damper that automatically opens when the exhaust system operates. Dampers shall be accessible for inspection, service repair and replacement without removing permanent construction or any other ducts not connected to the damper being inspected, serviced, repaired or replaced


2018 IRCWhere one or more gas, liquid or solid fuel-burning appliance that is neither direct-vent nor uses a mechanical draft venting system is located within a dwelling unit’s air barrier, each exhaust system capable of exhausting in excess of 400 cubic feet per minute shall be mechanically or passively provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with not fewer than one damper complying with Section M1503.6.2.

2018 IRC Update


M1503.4 Makeup air requiredM1503.6 in 2018

2018 exception

Exception: Makeup air is not required for exhaust systems installed for the exclusive purpose of space cooling and intended to be operated only when windows or other air inlets are open


M1503.4.1 Location M1503.6.1 in 2018

Kitchen exhaust makeup air shall be discharged into the same room in which the exhaust system is located or into rooms or duct systems that communicate through one or more permanent openings with the room in which such exhaust system is located. Such permanent openings shall have a net cross-sectional area not less than the required area of the makeup air supply openings


M1503.6.2 Makeup air dampers (2018)Where makeup air is required by Section M1503.6, makeup air dampers shall comply with this section. Each damper shall be a gravity damper or an electrically operated damper that automatically opens when the exhaust system operates. Dampers shall be located to allow access for inspection, service, repair and replacement without removing permanent construction or any other ducts not connected to the damper being inspected, serviced, repaired or replaced. Gravity or barometric dampers shall not be used in passive makeup air systems except where the dampers are rated to provide the design makeup airflow at a pressure differential of 0.01 in. w.c. (3 Pa) or less


M1506.2. Duct LengthM1504.2 in 2018

The length of exhaust and supply ducts used with ventilating equipment shall not exceed the lengths determined in accordance with Table M1506.2.

Exception: Duct length shall not be limited where the duct system complies with the manufacturer’s design criteria or where the flow rate of the installed ventilating equipment is verified by the installer or approved third party using a flow hood, flow grid or other airflow measuring device.


2018 IRC Update


Table M1506.2M1504.2 in 2018 no changes


M2101.10 Tests Hydronic piping systems shall be tested

hydrostatically…

New Exception: For PEX piping systems, testing with a

compressed gas shall be an alternative to hydrostatic testing where compressed air or other gas pressure testing is specifically authorized by all of the manufacturers’ instructions for the PEX pipe and fittings products installed at the time the system is being tested, and compressed air or other gas testing is not otherwise prohibited by applicable codes, laws, or regulations outside of this code.



FUEL GASPART VI

General Requirements Appliance Location Combustion, Ventilation & Dilution

Air Pipe Sizing, Materials, Installation Inspection, Testing, Purging Appliance Connections CNG Systems Venting of Equipment Decorative Appliances Clothes Dryers Pool & Spa Heaters Cooking Appliances Boilers

G2406.2 (303.3) Prohibited locations

Appliances shall not be located in sleeping rooms, bathrooms, toilet rooms, storage closets or surgical rooms, or in a space that opens only into such rooms or spaces, except where the installation complies with one of the following:

6. A clothes dryer is installed in a residential bathroom or toilet room having a permanent opening with an area of not less than 100 square inches that communicates with a space outside of a sleeping room, bathroom, toilet room or storage closet.


2018 IRC Update


G2411.2 (310.2) CSST (2018)


This section applies to corrugated stainless steel tubing (CSST) that is not listed with an arc-resistant jacket or coating system in accordance with ANSI LC1/CSA 6.26. CSST gas piping systems and piping systems containing one or more segments of CSST shall be electrically continuous and bonded to the electrical service grounding electrode system or, where provided, the lightning protection grounding electrode system.

G2411.3 (310.3) Arc-resistant CSST (2018)

Must be listed to ANSI LC 1/CSA 6026

Must be bonded to an effective ground fault current path

Shall be considered bonded when connected to a grounded appliance


G2412.9 (401.9)IdentificationEach length of pipe and tubing and each pipe fitting, utilized in a fuel gas system, shall bear the identification of the manufacturer.


Exceptions: New 20181. Steel pipe sections that are: two feet and less in length, cut from longer sections of pipe in the field and threaded in the field.2. Steel pipe fittings 2 inch and less in size.3. Where identification is provided on the product packaging or crating.4. Where other approved documentation is provided.

G2412.9 (401.10)Piping materials standards. (2018)

401.10 Third-party testing and certification. Piping materials standardsPiping, tubing and fittings shall comply with the applicable referenced standards, specifications and performance criteria of this code and shall be identified in accordance with Section 401.9. Piping, tubing and fittings shall either be tested by an approved third-party testing agency or certified by an approved third party certification agency.

Piping, tubing and fittings shall be manufactured to the applicable referenced standards, specifications an performance criteria listed in Section 403 of this code and shall be identified in accordance with Section 401.9.


2018 IRC Update


G2415.11 (404.11) Protection against corrosion Metallic

Steel pipe or tubing exposed to corrosive action, such as soil condition or moisture, shall be protected in accordance with cinders with sections 404.11.1 through 404.11.5.

G2415.11.1 (404.11.1) Galvanizing. Zinc coating shall not be deemed adequate protection for underground gas piping


G2415.11.2 (404.11.2) Protection methods.

Underground piping shall comply with one or more of the following:1. The piping shall be made of corrosion-resistant material that is suitable for the environment in which it will be installed.2. Pipe shall have a factory-applied, electrically-insulating coating. Fittings and joints between sections of coated pipe shall be coated in accordance with the coating manufacturer's instructions.3. The piping shall have a cathodic protection system installed and the system shall be monitored and maintained in accordance with an approved program.


G2415.11.3 (404.11.3) Dissimilar metals (2018)

Where dissimilar metals are joined underground, an insulating coupling or fitting shall be used.


G2415.11.4 (404.11.4) Protection of risers (2018)

Steel risers connected to plastic piping shall be cathodically protected by means of a welded anode, except where such risers are anodelessrisers.


2018 IRC Update


G2420.6 (409.7) Shutoff valves in tubing systems

Shutoff valves installed in tubing systems shall be rigidly and securely supported independently of the tubing.


G2442.2 (618.2) Forced-air furnaces The minimum unobstructed total area of the

outside and return air ducts or openings to a forced-air warm-air furnace shall be not less than 2 square inches for each 1,000 Btu/h output rating capacity of the furnace and not less than that specified in the furnace manufacturer’s installation instructions. The minimum unobstructed total area of supply ducts from a forced-air warm-air furnace shall be not less than 2 square inches for each 1,000 Btu/h output rating capacity of the furnace and not less than that specified in the furnace manufacturer’s installation instructions.


G2447.2 (623.2) Prohibited location Cooking appliances designed,

tested, listed and labeled for use in commercial occupancies shall not be installed within dwelling units or within any area where domestic cooking operations occur.

Exceptions: 1. Appliances that are also listed

as domestic cooking appliances. 2. Where the installation is

designed by a licensed Professional Engineer, in compliance with the manufacturer’s installation instructions.


PLUMBINGPART VII

Administration General Requirements Fixtures Water Heaters Water

Supply/Distribution Sanitary Drainage Vents Traps Fire Sprinklers

2018 IRC Update


P2503.7 Water-supply system testing New Exception: For PEX piping systems, testing

with a compressed gas shall be an alternative to hydrostatic testing where compressed air or other gas pressure testing is specifically authorized by the manufacturer’s instructions for the PEX pipe and fittings products installed at the time the system is being tested, and compressed air or other gas testing is not otherwise prohibited by applicable codes, laws or regulations outside of this code.


P2704.1 Slip joints Slip-joint connections shall

be installed only for tubular waste piping and only between the trap outlet of a fixture and the connection to the drainage piping.

Slip-joint connections shall be made with an approved elastomeric sealing gasket. Slip-joint connections shall be accessible.

Such access shall provide an opening that is not less than 12 inches in its smallest dimension.


P2713.1 Bathtub waste outlets and overflows (2018)

Bathtubs shall be equipped with a waste outlet and an overflow outlet that is not less than 1 ½ inches in diameter. The waste outlet shall be equipped with a water-tight stopper. Where an overflow is installed, the overflow shall be not less than 1 ½ inches in diameter.


Water Heaters P2801.6 Required pan

Added in 2018A plastic pan shall not be installed beneath a gas-fired water heater shall be constructed of material having a flame spread index of 25 or less and a smoke-developed index of 450 or less when tested in accordance with ASTM E84 or UL 723


2018 IRC Update


P2903.5 Water hammer

The flow velocity of the water distribution system shall be controlled to reduce the possibility of water hammer.

A water-hammer arrestor shall be installed where quick-closing valves are utilized.

Water-hammer arrestors shall be installed in accordance with the manufacturer’s instructions. Water-hammer arrestors shall conform to ASSE 1010.


Water Supply and Distribution P2906.6.1 Saddle tap fittings (2018)

The use of saddle tap fittings and combination saddle tap and valve fittings shall be prohibited


P2906.18.2 - Joint between PVC water service and CPVC water distribution

Where a PVC water service pipe connects to a CPVC pipe at the beginning of a water distribution system, the transition shall be by a mechanical fitting, an approved adapter fitting, a transition fitting or by a single, solvent-cemented transition joint.

A single, solvent-cemented transition joint shall be in compliance with ASTM F493 and the pipe, fitting and solvent cement manufacturers’ instructions. Solvent cement joint surfaces shall be clean, free from moisture and prepared with an approved primer.

Solvent cement conforming to ASTM F493 shall be applied to the joint surfaces and the joint assembled while the cement is wet.


P3003.13.4 Plastic pipe or tubing to other piping material (2018)

Joints between different types of plastic pipe shall be made with an approved adapter fitting or by a solvent-cement joint only where a single joint is made between ABS and PVC pipes at the end of a building drainage pipe and the beginning of a building sewer pipe using a solvent cement complying with ASTM D3138. Joints between plastic pipe and other piping material shall be made with an approved adapter fitting. Joints between plastic pipe and cast-iron hub pipe shall be made by a caulked joint or a mechanical compression joint.


2018 IRC Update


Sanitary DrainageP3005.1.6 Drainage piping size reduction in the direction of flow

Added in 20182. A water closet bend fitting having a 4-inch inlet and a 3-inch outlet provided that the 4-inch leg of the fitting is upright and below, but not necessarily directly connected to, the water closet flange.3. An offset closet flange


Vent Terminals New 2018P3103.1.3 Roof extension coveredWhere an open vent is covered by either a roof-mounted panel (such as a solar collector or photovoltaic panel mounted over the vent opening) …the vent pipe shall terminate not less than 2 inches above the roof surface….designed to prevent the adverse effects of snow accumulation and wind on the function of the vent.The placement of a panel over a vent pipe and …..covering the vent pipe shall provide for an open area for the vent pipe to the outdoors that is not less than the area of the pipe, as calculated from the inside diameter of the pipe. Such vent terminals shall be protected by a method that prevents birds and rodents from entering or blocking the vent pipe opening


Air Admittance ValvesP3114.8 Prohibited installations

Added for 2018Air admittance valves shall not be installed on outdoor vent terminals for the sole purpose of reducing clearances to gravity or mechanical air intakes

© 2018 Colorado Code Consulting, LLC 219 220© 2018 Colorado Code Consulting, LLC

2018 IRC Update


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