Sizing Hoof Rafters

Select the smallest dimension rafter that is able to span the roof as described below.

Building location is: Ottawa, Ontario, specified roof snow load is 36 lbs/ft;(1.72 kPa). Roof slope is 1 in 3. Rafter span is 15'-6" (4.7 m).

Commercial designation and grade specified is SPF No. 2 or better

Shingle roofing to be used.

Lower ends of the rafter are restrained.

Selection

Use Table 26.

Acceptable rafters include:

2" x 8" (38 x 184 mm) at 12" o.c. (300 mm o.c.)

2" x 10" (38 x 235 mm) at 24" o.c. (600 mm o.c.)

SIZING ROOF JOISTS 1

Select the roof joists thai ice able to span the roof as described below.

Conditions

Building location is: Ottawa, Ontario.

Specified roof snow load is 36 lbs/ft (1.72 kPa).

Roof slope Is 1 in 3.

Commercial designation and grade specified is SPF No. 2 or better

Shingle roofing to be used.

Lower ends of tho roof joists are restrained.

Acceptable roof joists include:

2" xlO" 138 x 235 mrrij at 16" o.c. (400 mm ox.)

2" x 12" (38 x 286 mmi at 24" o.c. (600 mm o.c.)

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