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The installation of wood shingles shall comply with the provisions of this section and Table 1507.8.
TABLE 1507.8
WOOD SHINGLE AND SHAKE INSTALLATION
ROOF ITEM WOOD SHINGLES WOOD SHAKES
1. Roof slope Wood shingles shall be installed on slopes of not less than 3 units vertical in 12 units horizontal (3:12). Wood shakes shall be installed on slopes of not less than 4 units vertical in 12 units horizontal (4:12).
2. Deck requirement
Temperate climate Shingles shall be applied to roofs with solid or spaced sheathing. Where spaced sheathing is used, sheathing boards shall be not less than 1" × 4" nominal dimensions and shall be spaced on centers equal to the weather exposure to coincide with the placement of fasteners. Shakes shall be applied to roofs with solid or spaced sheathing. Where spaced sheathing is used, sheathing boards shall be not less than 1" × 4" nominal dimensions and shall be spaced on centers equal to the weather exposure to coincide with the placement of fasteners. Where 1" × 4" spaced sheathing is installed at 10 inches, boards must be installed between the sheathing boards.
In areas where the average daily temperature in January is 25°F or less or where there is a possibility of ice forming along the eaves causing a backup of water. Solid sheathing is required. Solid sheathing is required.
3. Interlayment No requirements. Interlayment shall comply with ASTM D226, Type 1.
4. Underlayment
Temperate climate Underlayment shall comply with Section 1507.1.1. Underlayment shall comply with Section 1507.1.1.
5. Application
Attachment Fasteners for wood shingles shall be hot-dipped galvanized or Type 304 (Type 316 for coastal areas) stainless steel with a minimum penetration of 0.75 inch into the sheathing. For sheathing less than 0.5 inch thick, the fasteners shall extend through the sheathing. Fasteners for wood shakes shall be hot-dipped galvanized or Type 304 (Type 316 for coastal areas) with a minimum penetration of 0.75 inch into the sheathing. For sheathing less than 0.5 inch thick, the fasteners shall extend through the sheathing.
No. of fasteners Two per shingle. Two per shake.
Exposure Weather exposures shall not exceed those set forth in Table 1507.8.7. Weather exposures shall not exceed those set forth in Table 1507.9.8.
Method Shingles shall be laid with a side lap of not less than 1.5 inches between joints in courses, and no two joints in any three adjacent courses shall be in direct alignment. Spacing between shingles shall be 0.25 to 0.375 inch. Shakes shall be laid with a side lap of not less than 1.5 inches between joints in adjacent courses. Spacing between shakes shall not be less than 0.375 inch or more than 0.625 inch for shakes and taper sawn shakes of naturally durable wood and shall be 0.25 to 0.375 inch for preservative-treated taper sawn shakes.
Flashing In accordance with Section 1507.8.8. In accordance with Section 1507.9.9.
For SI: 1 inch = 25.4 mm, °C = [(°F) - 32]/1.8.
1507.8.1 Deck Requirements
Wood shingles shall be installed on solid or spaced sheathing. Where spaced sheathing is used, sheathing boards shall be not less than 1-inch by 4-inch (25 mm by 102 mm) nominal dimensions and shall be spaced on centers equal to the weather exposure to coincide with the placement of fasteners.
1507.8.1.1 Solid Sheathing Required
Solid sheathing is required in areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water.
1507.8.2 Deck Slope
Wood shingles shall be installed on slopes of not less than three units vertical in 12 units horizontal (25-percent slope).
1507.8.3 Underlayment
Underlayment shall comply with Section 1507.1.1.
1507.8.4 Ice Barrier
Where required, ice barriers shall comply with Section 1507.1.2.
1507.8.5 Material Standards
Wood shingles shall be of naturally durable wood and comply with the requirements of Table 1507.8.5.
TABLE 1507.8.5
WOOD SHINGLE MATERIAL REQUIREMENTS
MATERIAL APPLICABLE MINIMUM GRADES GRADING RULES
Wood shingles of naturally durable wood 1, 2 or 3 CSSB
CSSB = Cedar Shake and Shingle Bureau
1507.8.6 Attachment
Fasteners for wood shingles shall be corrosion resistant with a minimum penetration of 3/4 inch (19.1 mm) into the sheathing. For sheathing less than 1/2 inch (12.7 mm) in thickness, the fasteners shall extend through the sheathing. Each shingle shall be attached with not fewer than two fasteners.
1507.8.7 Application
Wood shingles shall be laid with a side lap not less than 11/2 inches (38 mm) between joints in adjacent courses, and not be in direct alignment in alternate courses. Spacing between shingles shall be 1/4 to 3/8 inch (6.4 to 9.5 mm). Weather exposure for wood shingles shall not exceed that set in Table 1507.8.7.
TABLE 1507.8.7
WOOD SHINGLE WEATHER EXPOSURE AND ROOF SLOPE
ROOFING MATERIAL LENGTH (inches) GRADE EXPOSURE (inches)
3:12 pitch to < 4:12 4:12 pitch or steeper
Shingles of naturally durable wood 16 No. 1

No. 2

No. 3
3.75

3.5

3
5

4

3.5
18 No. 1

No. 2

No. 3
4.25

4

3.5
5.5

4.5

4
24 No. 1

No. 2

No. 3
5.75

5.5

5
7.5

6.5

5.5
For SI: 1 inch = 25.4 mm.
1507.8.8 Flashing
At the juncture of the roof and vertical surfaces, flashing and counterflashing shall be provided in accordance with the manufacturer's installation instructions, and where of metal, shall be not less than 0.019-inch (0.48 mm) (No. 26 galvanized sheet gage) corrosion-resistant metal. The valley flashing shall extend not less than 11 inches (279 mm) from the centerline each way and have a splash diverter rib not less than 1 inch (25 mm) high at the flow line formed as part of the flashing. Sections of flashing shall have an end lap of not less than 4 inches (102 mm). For roof slopes of three units vertical in 12 units horizontal (25-percent slope) and over, the valley flashing shall have a 36-inch-wide (914 mm) underlayment of either one layer of Type I underlayment running the full length of the valley or a self-adhering polymer-modified bitumen sheet bearing a label indicating compliance with ASTM D1970, in addition to other required underlayment. In areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice forming along the eaves causing a backup of water, the metal valley flashing underlayment shall be solidly cemented to the roofing underlayment for slopes under seven units vertical in 12 units horizontal (58-percent slope) or self-adhering polymer-modified bitumen sheet shall be installed.
1507.8.9 Label Required
Each bundle of shingles shall be identified by a label of an approved grading or inspection bureau or agency.

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