Figure 2-21.-Step-off method for calculating common rafter length.

Figure 2-19.-Steel square used to lay out plumb and seat cuts.

Builder 3&2 Volume 02 - Construction manual for building structures
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Figure 2-21.-Step-off method for calculating common rafter length. Step 1. Lay out the rafter line length. Hold the the center line of the roof. From either end framing square with the tongue in your right hand, the blade in the left, and the heel away from your body. Place the square as near the right end of the rafter as possible with the unit of rise on the tongue and the unit of run on the blade along the edge of the rafter stock. Strike a plumb mark along the tongue on the wide part of the material. This mark represents of this mark, measure the line length of the rafter and mark the edge of the rafter stock. Hold the framing square in the same manner with the 6 on the tongue on the mark just made and the 12 on the blade along the edge. Strike a line along the tongue, his mark represents the plumb cut of the heel. 2-14

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