Wood shingles or machine-grooved shakes are sometimes used for wall covering. A large selection is available, including special wall shingles in
Comer treatment of siding: (A) corner boards; (B) mitred corner; (C) metal corner; (D) siding return on main roof, showing, corner boards. Mitred or metal comers can also be used on the return, depending on the design.
corner boards siding
corner board step flashing siding to have 2" (50 mm) clearance above shingles
lengths of 16, 18 and 24 in. (400, 450 and 600 mm), factory-painted or stained.
Shingles are usually separated into three grades. The first grade is composed of clear shingles, all heart-wood, all edge grain. The second grade consists of shingles with clear butts and permits defects in the part of the shingle which is normally covered in use. The third grade includes shingles that have defects other than those permitted in the second grade. These shingles may be used for undercoursing.
Shingles are made in random widths varying in the first grade from 2 1/2 to 14 in. (65 to 350 mm); only a small proportion of the narrow width is permitted in the first grade. Shingles of a uniform width, known as dimension shingles, are also available. Widths of 4, 5 or 6 in. (100, 125 or 150 mm) may be specified. Table 36 shows the commonly used exposure and thickness of wood shingles and machine-grooved shakes. Lumber, oriented strand board, waferboard or plywood sheathing should be used under shingles or shakes.
When the single-course application is used, the joints in succeeding courses should be offset at least 1 9/16 in. (40 mm), and care taken that the joints in any two or three courses do not line up.
To obtain deep shadow lines, shingles can be laid in what is called double-coursing. This may be done by using a lower grade shingle under the shingle exposed to the weather. The exposed shingle butt extends about 1/2 in. (12 mm) below the butt of the undercourse. Where double-coursing is used, wider exposure to the weather is possible, joints in the outer course should be offset from joints in the undercourse by at least 1 9/16 in. (40 mm).
Shingles should be fastened with corrosion-resistant nails. Shingles up to 8 in. (200 mm) wide require only two nails. Those more than 8 in. (200 mm) wide require three. Nails should be driven about 13/16 in. (20 mm) from the edges and 1 in. (25 mm) above the exposure line for single-course application, and 2 in. (50 mm) for double coursing.
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