Wood Shingles

Wood shingles commonly used for houses are No. i and No. 2 grade. Red or white cedar are the principal species of wood used for shingles, because their heartwoods have high decay resistance and low shrinkage. Pine and yellow cedar are also used for shingles. The width of wood shingles varies, but the maximum width is 14 in. (350 mm) with a minimum width of 3 in. (75 mm).

Figure 73 illustrates the proper method of laying a wood-shingle roof. As is the case for asphalt shingles, underlay and roofing felt is not usually required for wood shingles, but eave protection, as described previously, should be installed.

The first shingle course should be laid double with the upper shingles overlapping the joints in the course beneath and both rows extending about 1 in. (25 mm) beyond the fascia boards at the eaves. This precaution will prevent water from backing up underneath the shingles. Shingles should be laid 1/4 in. (6 mm) apart to allow for swelling when wet. The joints between shingles in one course should be offset at least 1 9/16 in. (40 mm) from the joint between shingles in the course below. The joints in succeeding courses should be spaced so that the joint in one course is not in line with the joints in the two previous courses laid.

Only two nails should be used for each shingle. The distance of the nails from the butt edge of the shingle being nailed should be the shingle exposure plus 1 9/16 in. (40 mm), with

Installation of wood shingles.

Installation of wood shingles.

eave protection to run 12" (300 mm) beyond inside face of stud line roof sheathing two nails per shingle

•3/i6" (20 mm) edge distance to nails wood shingles exposure 1 9/i6" (40 mm) lap V4" (6 mm) space between shingles fascia board first shingle course (double) extend 1" (25 mm)

project shingles l/i" (12 mm) for drip eave protection to run 12" (300 mm) beyond inside face of stud line roof sheathing two nails per shingle

•3/i6" (20 mm) edge distance to nails wood shingles exposure 1 9/i6" (40 mm) lap V4" (6 mm) space between shingles fascia board first shingle course (double) extend 1" (25 mm)

o project shingles l/i" (12 mm) for drip ari edge distance of about 13/16 in. (20 mm). For example, if the shingle exposure is to be 5 in. (125 mm), add 1 9/16 in. (40 mm), and thus the nail should be 6 9/i6 in. (165 mm) from the butt edge of the shingle being nailed. Shingles are fastened with hot-dip galvanized or other corrosion-resistant shingle nails. Flat grain shingles wider than 8 in. (200 mm) are sometimes split and nailed as two shingles to avoid problems with cupping and warping.

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