IRWIN Rafter Square Reference Guide
common scale lines up with the edge of the rafter. Starting at the pivot point along the top edge of the square, mark your line while holding the pivot point firmly against the rafter and keeping the number 7 lined up properly. This will be the top plumb cut. 2. Seat Notch or Birds Mouth: Using the rafter length (our example: 17' 43⁄
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