Use the 2' square to determine the number of inches rise and pitch.

1/2 Pitch is 1/2 of 24" or 12" rise to 12" base.

1/3 Pitch is 1/3 of 24" or 8" rise to 12" base.

1/4 Pitch is 1/4 of 24" or 6" rise to 12" base.

1/6 Pitch is 1/6 of 24" or 4" rise to 12" base.

1/8 Pitch is 1/8 of 24" or 3" rise to 12" base.

(See fig. 24.) Or take 1/2, 1/3 or 1/4 of the width of the building for the pitch of the roof.

Fig. 24