How To Figure Roof Pitch With A Framing Square

Find the unit rise say inches per foot of the roof on the top line in the framing square rafter table e g.

How to figure roof pitch with a framing square.

This article explains how to make quick use of a framing square and its imprinted data to get some basic roof measurement data like roof pitch or slope rafter lengths and end cuts. The hash marks with corresponding numbers between 1 and 30 refer to the roof s rise angle. The pitch of the roof is read where the bottom of the rafter crosses this scale. 8 inches and you have an 8 in 12 pitch.

Directly below the 6 inch mark on the framing square read the required rafter length 13 42 per foot of run for a 6 inch rise 6 in 12 roof. If this distance measures 4 inches you have a 4 in 12 pitch. A 6 inch rise per foot. Read this number along the inches scale at the top of the framing square.

Pitch measurement method 1. On a ladder beside the roof place the level a foot or so up the roof hold it level and measure from the 12 inch mark on the level s bottom straight down to the roof.