Tempo:
(smooth surface) or type M (mineral-surfaced) roll roofing should be installed over the sheathing, laid with the joints lapped at least 100 mm (4 in.) and cemented together. Alternatively, a peel-and-stick bituminous membrane may be used. Methods of flashing shingled roofs at valleys, chimneys and intersecting walls are described in Chapter 14.
ROOF COVERINGS The roof covering should be installed as soon as the sheathing is in place to keep the building dry and to provide durable, water-resistant protection. The choice of roofing materials may be influenced by cost, appearance, local code requirements or local preferences. Asphalt shingles are commonly used on pitched roofs. Prefinished metal, galvanized steel or aluminum roofing is also common in some regions. At normal roof pitches, metal roofs will generally shed snow, a desirable characteristic in heavy snowfall areas. Roll roofing, wood shingles, hand-split shakes, sheet metal and concrete or clay tile are also used. Built-up roofing with a gravel topping or cap sheet is usually used for low-slope roofs.
The minimum and maximum slopes for the different types of roof coverings are presented in Table 36 (p. 306). The minimum slope of roofs is 1:6 for asphalt shingles (using a low-slope application), 1:4 for wood shingles, and 1:3 for hand-split shakes and asphalt shingles (using normal application).
Asphalt Shingles on Slopes 1:3 or Greater Asphalt strip shingles should be a minimum No. 210 grade. Square-butt strip shingles are usually 310 × 915 mm (12 × 36 in.) or 335 × 1 000 mm (131⁄4 × 39 3⁄8 in.) in size, have three tabs and should be laid with 130 mm (5 in.) or 145 mm (5¾ in.) of their width exposed to the weather. Since there are approximately 21 to 26 strips in a bundle, a bundle will cover about 3 m2 (32 sq. ft.). Store bundles flat so that strips will not curl when the bundles are opened. Distribute the storage of shingles on roofs so that the load capacity of the framing is not exceeded. The method for installing asphalt shingles is shown in Figure 101. Install the eave protection where required. Apply a starter
101 Application of asphalt shingles roof sheathing eave protection roofing nail tar seals exposure fascia board starting course either solid strip or reversed shingles with tabs removed
ROOF COVERINGS The roof covering should be installed as soon as the sheathing is in place to keep the building dry and to provide durable, water-resistant protection. The choice of roofing materials may be influenced by cost, appearance, local code requirements or local preferences. Asphalt shingles are commonly used on pitched roofs. Prefinished metal, galvanized steel or aluminum roofing is also common in some regions. At normal roof pitches, metal roofs will generally shed snow, a desirable characteristic in heavy snowfall areas. Roll roofing, wood shingles, hand-split shakes, sheet metal and concrete or clay tile are also used. Built-up roofing with a gravel topping or cap sheet is usually used for low-slope roofs.
The minimum and maximum slopes for the different types of roof coverings are presented in Table 36 (p. 306). The minimum slope of roofs is 1:6 for asphalt shingles (using a low-slope application), 1:4 for wood shingles, and 1:3 for hand-split shakes and asphalt shingles (using normal application).
Asphalt Shingles on Slopes 1:3 or Greater Asphalt strip shingles should be a minimum No. 210 grade. Square-butt strip shingles are usually 310 × 915 mm (12 × 36 in.) or 335 × 1 000 mm (131⁄4 × 39 3⁄8 in.) in size, have three tabs and should be laid with 130 mm (5 in.) or 145 mm (5¾ in.) of their width exposed to the weather. Since there are approximately 21 to 26 strips in a bundle, a bundle will cover about 3 m2 (32 sq. ft.). Store bundles flat so that strips will not curl when the bundles are opened. Distribute the storage of shingles on roofs so that the load capacity of the framing is not exceeded. The method for installing asphalt shingles is shown in Figure 101. Install the eave protection where required. Apply a starter
101 Application of asphalt shingles roof sheathing eave protection roofing nail tar seals exposure fascia board starting course either solid strip or reversed shingles with tabs removed
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