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IRWIN Rafter Square Reference Guide

IRWIN Rafter Square Reference Guide

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allowance can be obtained by using the tables as well. EXAMPLE: Using the 7 Inch Rise page and assuming 2 x 6 lumber (which has a depth of 51⁄ 2"), use the Rafter Depth and Bottom Allowance table to see that the common and jack allowance equals 33⁄ 16" inches. The total lumber length required for this common rafter is: RAFTER LENGTH = 17' 43⁄

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