Tempo:
shakes laid with 250 mm (10 in.) exposure would need to have felt applied 500 mm (20 in.) above the shake butts. Thus, the felt will cover the top 100 mm (4 in.) of the shakes and extend about 350 mm (15 in.) onto the sheathing (Figure 103). Space shakes from 6 to 9 mm (1⁄4 to 3⁄8 in.) apart. Offset side joints no less than 40 mm (19⁄16 in.) over the adjacent courses. When straight split shakes are used, the “froe-end” (the end from which the shakes have been split, and which is smoother) should be laid uppermost (towards the ridge).
Finish at Ridge and Hips The most common type of finish for asphalt shingles is shown in Figure 104. Asphalt shingle squares (one third of a strip) are used over the
ridge or hip and blind-nailed. Each shingle is lapped to provide the same coverage as the roofing shingles. Orient the ridge cap to provide maximum protection from the prevailing wind. For wood shingles, 150 mm (6 in.) wide shingles are alternatively lapped and blind-nailed (Figure 104). Flashing is sometimes used under a wood-shingle ridge.
Built-up Roofs Built-up roof coverings should be installed by specialized roofing installers. A built-up roof may have three or more layers of roofing felt. Each layer, including the final layer, is sealed with tar or asphalt. The surface is then covered with gravel (embedded in the asphalt or tar) or with a cap sheet. This covering provides ballast against wind uplift and protection from the sun.
104 Finish at ridge and hips prevailing wind
Asphalt shingles
nail
prevailing wind
Wood shingles
No. 15 roofing felt nail
Finish at Ridge and Hips The most common type of finish for asphalt shingles is shown in Figure 104. Asphalt shingle squares (one third of a strip) are used over the
ridge or hip and blind-nailed. Each shingle is lapped to provide the same coverage as the roofing shingles. Orient the ridge cap to provide maximum protection from the prevailing wind. For wood shingles, 150 mm (6 in.) wide shingles are alternatively lapped and blind-nailed (Figure 104). Flashing is sometimes used under a wood-shingle ridge.
Built-up Roofs Built-up roof coverings should be installed by specialized roofing installers. A built-up roof may have three or more layers of roofing felt. Each layer, including the final layer, is sealed with tar or asphalt. The surface is then covered with gravel (embedded in the asphalt or tar) or with a cap sheet. This covering provides ballast against wind uplift and protection from the sun.
104 Finish at ridge and hips prevailing wind
Asphalt shingles
nail
prevailing wind
Wood shingles
No. 15 roofing felt nail
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