IRWIN Rafter Square Reference Guide
This is the rafter length from the top cut to the seat plumb mark. tail or eave Length: The tail or eave overhang must be added to the rafter length. (See figure 5 for various eave constructions.) EXAMPLE: With a tail run of 1' 8", use the same 7 Inch Rise table, under Common Rafter Length: 1' Run = 1' 17⁄ 8" 8" Run = 91⁄ 4" 1' 8" Tail = 1 ...
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