Page 105 - 2018_IRC

BUILDING PLANNING

6. Identity of the approved inspection agency. manufacturer’s recommendations, Section R317.3.3 shall
7. The designation “Dry,” if applicable. apply.
Exception: Quality marks on lumber less than 1 inch R317.4 Plastic composites. Plastic composite exterior deck
(25 mm) nominal thickness, or lumber less than nomi- boards, stair treads, guards and handrails containing wood,
nal 1 inch by 5 inches (25 mm by 127 mm) or 2 inches cellulosic or other biodegradable materials shall comply with
by 4 inches (51 mm by 102 mm) or lumber 36 inches the requirements of Section R507.2.2.
(914 mm) or less in length shall be applied by stamping
the faces of exterior pieces or by end labeling not less
SECTION R318
than 25 percent of the pieces of a bundled unit. PROTECTION AGAINST
R317.3 Fasteners and connectors in contact with preser- SUBTERRANEAN TERMITES
vative-treated and fire-retardant-treated wood. Fasteners,
including nuts and washers, and connectors in contact with R318.1 Subterranean termite control methods. In areas
preservative-treated wood and fire-retardant-treated wood subject to damage from termites as indicated by Table
shall be in accordance with this section. The coating weights R301.2(1), protection shall be by one, or a combination, of
for zinc-coated fasteners shall be in accordance with ASTM the following methods:
A153. Stainless steel driven fasteners shall be in accordance 1. Chemical termiticide treatment in accordance with Sec-
with the material requirements of ASTM F1667. tion R318.2.
R317.3.1 Fasteners for preservative-treated wood. Fas- 2. Termite-baiting system installed and maintained in
teners, including nuts and washers, for preservative- accordance with the label.
treated wood shall be of hot-dipped, zinc-coated galva- 3. Pressure-preservative-treated wood in accordance with
nized steel, stainless steel, silicon bronze or copper. Sta- the provisions of Section R317.1.
ples shall be of stainless steel. Coating types and weights
for connectors in contact with preservative-treated wood 4. Naturally durable termite-resistant wood.
shall be in accordance with the connector manufacturer’s 5. Physical barriers in accordance with Section R318.3
recommendations. In the absence of manufacturer’s rec- and used in locations as specified in Section R317.1.
ommendations, not less than ASTM A653 type G185 zinc-
coated galvanized steel, or equivalent, shall be used. 6. Cold-formed steel framing in accordance with Sections
R505.2.1 and R603.2.1.
Exceptions:
R318.1.1 Quality mark. Lumber and plywood required to
1. / -inch-diameter (12.7 mm) or greater steel bolts. be pressure-preservative treated in accordance with Sec-
1
2
2. Fasteners other than nails, staples and timber riv- tion R318.1 shall bear the quality mark of an approved
ets shall be permitted to be of mechanically inspection agency that maintains continuing supervision,
deposited zinc-coated steel with coating weights testing and inspection over the quality of the product and
in accordance with ASTM B695, Class 55 mini- that has been approved by an accreditation body that com-
mum. plies with the requirements of the American Lumber Stan-
dard Committee treated wood program.
3. Plain carbon steel fasteners in SBX/DOT and
zinc borate preservative-treated wood in an inte- R318.1.2 Field treatment. Field-cut ends, notches and
rior, dry environment shall be permitted. drilled holes of pressure-preservative-treated wood shall
R317.3.2 Fastenings for wood foundations. Fastenings, be retreated in the field in accordance with AWPA M4.
including nuts and washers, for wood foundations shall be R318.2 Chemical termiticide treatment. Chemical termiti-
as required in AWC PWF. cide treatment shall include soil treatment or field-applied
R317.3.3 Fasteners for fire-retardant-treated wood wood treatment. The concentration, rate of application and
used in exterior applications or wet or damp locations. method of treatment of the chemical termiticide shall be in
Fasteners, including nuts and washers, for fire-retardant- strict accordance with the termiticide label.
treated wood used in exterior applications or wet or damp R318.3 Barriers. Approved physical barriers, such as metal
locations shall be of hot-dipped, zinc-coated galvanized or plastic sheeting or collars specifically designed for termite
steel, stainless steel, silicon bronze or copper. Fasteners prevention, shall be installed in a manner to prevent termites
other than nails, staples and timber rivets shall be permit- from entering the structure. Shields placed on top of an exte-
ted to be of mechanically deposited zinc-coated steel with rior foundation wall shall be used only if in combination with
coating weights in accordance with ASTM B695, Class 55 another method of protection.
minimum.
R318.4 Foam plastic protection. In areas where the proba-
R317.3.4 Fasteners for fire-retardant-treated wood bility of termite infestation is “very heavy” as indicated in
used in interior applications. Fasteners, including nuts Figure R301.2(7), extruded and expanded polystyrene, poly-
and washers, for fire-retardant-treated wood used in inte- isocyanurate and other foam plastics shall not be installed on
rior locations shall be in accordance with the manufac- the exterior face or under interior or exterior foundation walls
turer’s recommendations. In the absence of the or slab foundations located below grade. The clearance

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