ABC of the Steel Square and Its Uses

by Fred. T. Hodgson

Fig. 33.

Fig. 34.

[Fig. 34] illustrates a way to cut rafters with the square.

A roof 14 feet wide would have a run of 7 feet, third-pitch would rise 8 inches to every foot run. Therefore, place the square on 8 and 12 seven times, and you have length and cuts.

[Fig. 35]. For the octagon rafter, proceed same as common rafter, only use 13 for run (in place of 12 for common rafter).

Fig. 35.

[Fig. 36], hip or valley rafter. As these rafters run diagonal with the common rafter and as the diagonal of 1 foot is practically 17 inches, use 17 for run, and proceed same as common rafter.