Page 393 - 2018_IRC

WALL COVERING

into sheathing and framing combined. Vinyl siding 2. At the intersection of chimneys or other masonry con-
and insulated vinyl siding shall be permitted to be struction with frame or stucco walls, with projecting
installed with fasteners penetrating into or through lips on both sides under stucco copings.
wood or wood structural sheathing of minimum 3. Under and at the ends of masonry, wood or metal cop-
thickness as specified by the manufacturer’s instruc- ings and sills.
tions or test report, with or without penetration into
the framing. Where the fastener penetrates fully 4. Continuously above all projecting wood trim.
through the sheathing, the end of the fastener shall 5. Where exterior porches, decks or stairs attach to a wall
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extend not less than / inch (6.4 mm) beyond the or floor assembly of wood-frame construction.
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opposite face of the sheathing. Fasteners for vinyl 6. At wall and roof intersections.
siding and insulated vinyl siding installed over foam
plastic sheathing shall be in accordance with Section 7. At built-in gutters.
R703.11.2. Fasteners for vinyl siding and insulated R703.5 Wood, hardboard and wood structural panel sid-
vinyl siding installed over fiberboard or gypsum ing. Wood, hardboard, and wood structural panel siding shall
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sheathing shall penetrate not less than 1 / inches (32 be installed in accordance with this section and Table
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mm) into framing. R703.3(1). Hardboard siding shall comply with CPA/ANSI
4. Fasteners for vertical or horizontal wood siding shall A135.6. Hardboard siding used as architectural trim shall
penetrate not less than 1 / inches (38 mm) into studs, comply with CPA/ANSI A 135.7.
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studs and wood sheathing combined, or blocking. R703.5.1 Vertical wood siding. Wood siding applied ver-
5. Fasteners for siding material installed over foam tically shall be nailed to horizontal nailing strips or block-
plastic sheathing shall have sufficient length to ing set not more than 24 inches (610 mm) on center.
accommodate foam plastic sheathing thickness and R703.5.2 Panel siding. Three-eighths-inch (9.5 mm)
to penetrate framing or sheathing and framing com- wood structural panel siding shall not be applied directly
bined, as specified in Items 1 through 4. to studs spaced more than 16 inches (406 mm) on center
R703.4 Flashing. Approved corrosion-resistant flashing shall where long dimension is parallel to studs. Wood structural
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be applied shingle-fashion in a manner to prevent entry of panel siding / inch (11.1 mm) or thinner shall not be
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water into the wall cavity or penetration of water to the build- applied directly to studs spaced more than 24 inches (610
ing structural framing components. Self-adhered membranes mm) on center. The stud spacing shall not exceed the
used as flashing shall comply with AAMA 711. Fluid-applied panel span rating provided by the manufacturer unless the
membranes used as flashing in exterior walls shall comply panels are installed with the face grain perpendicular to the
with AAMA 714. The flashing shall extend to the surface of studs or over sheathing approved for that stud spacing.
the exterior wall finish. Approved corrosion-resistant flash- Joints in wood, hardboard or wood structural panel sid-
ings shall be installed at the following locations: ing shall be made as follows unless otherwise approved.
1. Exterior window and door openings. Flashing at exte- Vertical joints in panel siding shall occur over framing
rior window and door openings shall extend to the sur- members, unless wood or wood structural panel sheathing
face of the exterior wall finish or to the water-resistive is used, and shall be shiplapped or covered with a batten.
barrier complying with Section 703.2 for subsequent Horizontal joints in panel siding shall be lapped not less
drainage. Mechanically attached flexible flashings shall than 1 inch (25 mm) or shall be shiplapped or flashed with
comply with AAMA 712. Flashing at exterior window Z-flashing and occur over solid blocking, wood or wood
and door openings shall be installed in accordance with structural panel sheathing.
one or more of the following: R703.5.3 Horizontal wood siding. Horizontal lap siding
1.1. The fenestration manufacturer’s installation and shall be installed in accordance with the manufacturer’s
flashing instructions, or for applications not recommendations. Where there are no recommendations
addressed in the fenestration manufacturer’s the siding shall be lapped not less than 1 inch (25 mm), or
instructions, in accordance with the flashing 1 / inch (12.7 mm) if rabbeted, and shall have the ends
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manufacturer’s instructions. Where flashing caulked, covered with a batten or sealed and installed over
instructions or details are not provided, pan flash- a strip of flashing.
ing shall be installed at the sill of exterior window R703.6 Wood shakes and shingles. Wood shakes and shin-
and door openings. Pan flashing shall be sealed or gles shall conform to CSSB.
sloped in such a manner as to direct water to the R703.6.1 Application. Wood shakes or shingles shall be
surface of the exterior wall finish or to the water- applied either single course or double course over nominal
resistive barrier for subsequent drainage. Open- 1 / -inch (12.7 mm) wood-based sheathing or to furring strips
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ings using pan flashing shall incorporate flashing over / -inch (12.7 mm) nominal nonwood sheathing. A
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or protection at the head and sides. water-resistive barrier shall be provided over all sheathing,
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1.2. In accordance with the flashing design or with horizontal overlaps in the membrane of not less than 2
method of a registered design professional. inches (51 mm) and vertical overlaps of not less than 6
1.3. In accordance with other approved methods. inches (152 mm). Where horizontal furring strips are used,
they shall be 1 inch by 3 inches or 1 inch by 4 inches (25 mm

368 2018 INTERNATIONAL RESIDENTIAL CODE ®
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