Tempo:
Where rainscreen construction is used, the furring strips should be kept back from the joints where water is most likely to enter, so that drainage and drying can occur. Metal corners that match the colour of the siding can be used and require less skill than mitred corners or fitting siding to a corner board. Corner boards are made of 25 or 38 mm (1 or 11⁄2 in. nominal) material, depending on the thickness of the siding. The corner boards are applied against the sheathing with the siding fitted tightly against the narrow edge of the corner boards. Bed the siding in putty or sealant to obtain a tight joint. Plywood and hardboard are usually lapped at the corners or fitted to a corner board. Lumber siding applied vertically is lapped at the corners.
Wood Shingles and Shakes Wood shingles or machine-grooved shakes are sometimes used for wall cladding. They are available in lengths of 400, 450 and 600 mm (16, 18 and 24 in.) and may be factory-painted or stained. Plywood, OSB or lumber sheathing should be used under shingles or shakes. Shingles are separated into three grades. The first grade is composed of clear shingles, all heartwood, and all edge grain. The second grade consists of shingles with clear butts and permits defects in the part of the shingle that is normally covered in use. The third grade includes shingles that have defects other than those permitted in the second grade and are only suitable for under-coursing. First grade material is made in random widths varying from 65 to 350 mm (21⁄2 to 14 in.) and only a small proportion of the narrow width is permitted. Shingles of a uniform width, known as dimension shingles, are also available in widths of 100, 125 or 150 mm (4, 5 or 6 in.). Table 37 (p. 306) shows the commonly used
exposure and thickness of wood shingles and machine-grooved shakes. Wood shingles are most commonly applied in a single course using first- and second-grade shingles. When the single-course application is used, offset the joints in succeeding courses at least 40 mm (19⁄16 in.), and ensure that 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 by using a lower grade shingle under the shingle exposed to the weather. The exposed shingle butt extends about 12 mm (1⁄2 in.) below the butt of the undercourse. Where double-coursing is used, wider exposure to the weather is possible. Offset joints in the outer course from joints in the undercourse by at least 40 mm (1 9⁄16 in.). Fasten shingles and shakes with corrosionresistant nails. Shingles up to 200 mm (8 in.) wide require only two nails and those more than 200 mm (8 in.) wide require three. Drive nails about 20 mm (13⁄16 in.) from the edges and 25 mm (1 in.) above the exposure line for single-course application, and 50 mm (2 in.) for double coursing.
Stucco Finishes Stucco is a mixture of Portland cement and well-graded sand, with hydrated lime or masonry cement added to make the mixture more plastic (Table 39 on p. 307). Other proprietary stucco mixes are available. Their formulations will vary depending on the manufacturer of the mix. Usually applied in three coats (two base coats and one finish coat), the stucco is held in place by stucco mesh or wire lath. A variety of finish coats are available, from standard coloured cement finishes to textured acrylics. Acrylic finish coats are often applied over conventional Portland cement, with good results. It is important that the chosen product be durable and vapour-permeable.
Wood Shingles and Shakes Wood shingles or machine-grooved shakes are sometimes used for wall cladding. They are available in lengths of 400, 450 and 600 mm (16, 18 and 24 in.) and may be factory-painted or stained. Plywood, OSB or lumber sheathing should be used under shingles or shakes. Shingles are separated into three grades. The first grade is composed of clear shingles, all heartwood, and all edge grain. The second grade consists of shingles with clear butts and permits defects in the part of the shingle that is normally covered in use. The third grade includes shingles that have defects other than those permitted in the second grade and are only suitable for under-coursing. First grade material is made in random widths varying from 65 to 350 mm (21⁄2 to 14 in.) and only a small proportion of the narrow width is permitted. Shingles of a uniform width, known as dimension shingles, are also available in widths of 100, 125 or 150 mm (4, 5 or 6 in.). Table 37 (p. 306) shows the commonly used
exposure and thickness of wood shingles and machine-grooved shakes. Wood shingles are most commonly applied in a single course using first- and second-grade shingles. When the single-course application is used, offset the joints in succeeding courses at least 40 mm (19⁄16 in.), and ensure that 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 by using a lower grade shingle under the shingle exposed to the weather. The exposed shingle butt extends about 12 mm (1⁄2 in.) below the butt of the undercourse. Where double-coursing is used, wider exposure to the weather is possible. Offset joints in the outer course from joints in the undercourse by at least 40 mm (1 9⁄16 in.). Fasten shingles and shakes with corrosionresistant nails. Shingles up to 200 mm (8 in.) wide require only two nails and those more than 200 mm (8 in.) wide require three. Drive nails about 20 mm (13⁄16 in.) from the edges and 25 mm (1 in.) above the exposure line for single-course application, and 50 mm (2 in.) for double coursing.
Stucco Finishes Stucco is a mixture of Portland cement and well-graded sand, with hydrated lime or masonry cement added to make the mixture more plastic (Table 39 on p. 307). Other proprietary stucco mixes are available. Their formulations will vary depending on the manufacturer of the mix. Usually applied in three coats (two base coats and one finish coat), the stucco is held in place by stucco mesh or wire lath. A variety of finish coats are available, from standard coloured cement finishes to textured acrylics. Acrylic finish coats are often applied over conventional Portland cement, with good results. It is important that the chosen product be durable and vapour-permeable.
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