Page 187 - 2018_IRC

FLOORS

R507.2 Materials. Materials used for the construction of R507.2.2.3 Decay resistance. Plastic composite deck
decks shall comply with this section. boards, stair treads, guards and handrails containing
wood, cellulosic or other biodegradable materials shall
R507.2.1 Wood materials. Wood materials shall be No. 2
grade or better lumber, preservative-treated in accordance be decay resistant in accordance with ASTM D7032.
with Section R317, or approved, naturally durable lumber, R507.2.2.4 Termite resistance. Where required by
and termite protected where required in accordance with Section 318, plastic composite deck boards, stair treads,
Section R318. Where design in accordance with Section guards and handrails containing wood, cellulosic or
R301 is provided, wood structural members shall be other biodegradable materials shall be termite resistant
designed using the wet service factor defined in AWC in accordance with ASTM D7032.
NDS. Cuts, notches and drilled holes of preservative- R507.2.2.5 Installation of plastic composites. Plastic
treated wood members shall be treated in accordance with composite deck boards, stair treads, guards and hand-
Section R317.1.1. All preservative-treated wood products rails shall be installed in accordance with this code and
in contact with the ground shall be labeled for such usage. the manufacturer’s instructions.
R507.2.1.1 Engineered wood products. Engineered R507.2.3 Fasteners and connectors. Metal fasteners and
wood products shall be in accordance with Section connectors used for all decks shall be in accordance with
R502. Section R317.3 and Table R507.2.3.
R507.2.2 Plastic composite deck boards, stair treads, R507.2.4 Flashing. Flashing shall be corrosion-resistant
guards, or handrails. Plastic composite exterior deck metal of nominal thickness not less than 0.019 inch (0.48
boards, stair treads, guards and handrails shall comply mm) or approved nonmetallic material that is compatible
with the requirements of ASTM D7032 and this section. with the substrate of the structure and the decking materi-
R507.2.2.1 Labeling. Plastic composite deck boards als.
and stair treads, or their packaging, shall bear a label R507.2.5 Alternate materials. Alternative materials,
that indicates compliance with ASTM D7032 and including glass and metals, shall be permitted.
includes the allowable load and maximum allowable
span determined in accordance with ASTM D7032. R507.3 Footings. Decks shall be supported on concrete foot-
Plastic or composite handrails and guards, or their ings or other approved structural systems designed to accom-
packaging, shall bear a label that indicates compliance modate all loads in accordance with Section R301. Deck
with ASTM D7032 and includes the maximum allow- footings shall be sized to carry the imposed loads from the
able span determined in accordance with ASTM deck structure to the ground as shown in Figure R507.3. The
D7032. footing depth shall be in accordance with Section R403.1.4.
R507.2.2.2 Flame spread index. Plastic composite Exception: Free-standing decks consisting of joists
deck boards, stair treads, guards, and handrails shall directly supported on grade over their entire length.
exhibit a flame spread index not exceeding 200 when R507.3.1 Minimum size. The minimum size of concrete
tested in accordance with ASTM E84 or UL 723 with footings shall be in accordance with Table R507.3.1,
the test specimen remaining in place during the test. based on the tributary area and allowable soil-bearing
Exception: Plastic composites determined to be pressure in accordance with Table R401.4.1.
noncombustible.

TABLE R507.2.3
FASTENER AND CONNECTOR SPECIFICATIONS FOR DECKS a, b
ITEM MATERIAL MINIMUM FINISH/COATING ALTERNATE FINISH/COATING e
In accordance with Stainless steel, silicon bronze or
Nails and timber rivets Hot-dipped galvanized per ASTM A153
ASTM F1667 copper
Bolts c In accordance with Hot-dipped galvanized per ASTM A153, Class C
3
d
Lag screws ASTM A307 (bolts), (Class D for / -inch diameter and less) or mechani- Stainless steel, silicon bronze or
8
(including nuts and ASTM A563 (nuts), cally galvanized per ASTM B695, Class 55 or 410 copper
washers) ASTM F844 (washers) stainless steel
ASTM A653 type G185 zinc coated galvanized
Per manufacturer’s steel or post hot-dipped galvanized per ASTM
Metal connectors Stainless steel
specification A123 providing a minimum average coating
2
weight of 2.0 oz./ft (total both sides)
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
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.
1
1
c. Holes for bolts shall be drilled a minimum / inch and a maximum / inch larger than the bolt.
16
32
d. Lag screws / inch and larger shall be predrilled to avoid wood splitting per the National Design Specification (NDS) for Wood Construction.
1
2
e. Stainless-steel-driven fasteners shall be in accordance with ASTM F1667.
162 2018 INTERNATIONAL RESIDENTIAL CODE ®
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