Tempo:
CHOOSING THE SIZE AND SPACING OF ROOF JOISTS Problem Select the roof joists that are able to span the roof as follows.
Conditions
Building is located in Ottawa. Specified roof snow load is 1.72 kPa (36 lbs/sq. ft.).
Roof slope is 1 in 3.
Roof joist span is 4.19 m (13 ft. 9 in.).
Species group and grade specified is SPF No. 2 and better.
Shingle roofing to be used.
Lower ends of the roof joists are restrained.
Selection Use Table 29 (p. 295). Acceptable roof joists include: 38 × 235 mm (2 × 10 in.) at 400 mm (16 in.) on centre. 38 × 286 mm (2 × 12 in.) at 600 mm (24 in.) on centre. Note: The roof joists must also be deep enough to accommodate the required level of insulation.
96 Roof joists
Roof joist span = 4.19 m (13 ft. 9 in.)
3 1
Conditions
Building is located in Ottawa. Specified roof snow load is 1.72 kPa (36 lbs/sq. ft.).
Roof slope is 1 in 3.
Roof joist span is 4.19 m (13 ft. 9 in.).
Species group and grade specified is SPF No. 2 and better.
Shingle roofing to be used.
Lower ends of the roof joists are restrained.
Selection Use Table 29 (p. 295). Acceptable roof joists include: 38 × 235 mm (2 × 10 in.) at 400 mm (16 in.) on centre. 38 × 286 mm (2 × 12 in.) at 600 mm (24 in.) on centre. Note: The roof joists must also be deep enough to accommodate the required level of insulation.
96 Roof joists
Roof joist span = 4.19 m (13 ft. 9 in.)
3 1
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