IRWIN® Rafter Square Reference Guide Complete Instruction Book ...

2 INCH RISE 2-12 PITCH 9 1 ⁄2 DEGREESCommonRafterLengthHip or Val.RafterLengthRun Ft.1 1' 0 1 ⁄8" 1' 5 1 ⁄8"2 2' 0 3 ⁄8" 2' 10 1 ⁄8"3 3' 0 1 ⁄2" 4' 3 1 ⁄4"4 4' 0 5 ⁄8" 5' 8 3 ⁄8"5 5' 0 7 ⁄8" 7' 1 1 ⁄2"6 6' 1" 8' 6 1 ⁄2"7 7' 1 1 ⁄8" 9' 11 5 ⁄8"8 8' 1 3 ⁄8" 11' 4 3 ⁄4"9 9' 1 1 ⁄2" 12' 9 3 ⁄4"10 10' 1 5 ⁄8" 14' 2 7 ⁄8"11 11' 1 7 ⁄8" 15' 8"12 12' 2" 17' 1"13 13' 2 1 ⁄8" 18' 6 1 ⁄8"14 14' 2 3 ⁄8" 19' 11 1 ⁄4"15 15' 2 1 ⁄2" 21' 4 3 ⁄8"16 16' 2 5 ⁄8" 22' 9 3 ⁄8"17 17' 2 7 ⁄8" 24' 2 1 ⁄2"18 18' 3" 25' 7 5 ⁄8"19 19' 3 1 ⁄8" 27' 0 5 ⁄8"20 20' 3 3 ⁄8" 28' 5 3 ⁄4"21 21' 3 1 ⁄2" 29' 10 7 ⁄8"22 22' 3 5 ⁄8" 31' 3 7 ⁄8"23 23' 3 3 ⁄4" 32' 9"24 24' 4" 34' 2 1 ⁄8"25 25' 4 1 ⁄8" 35' 7 1 ⁄4"CommonRafterLength25Hip or Val.RafterLengthRun In.1⁄21⁄2" 3⁄4"1 1" 1 3 ⁄8"1 1 ⁄2 1 1 ⁄2" 2 1 ⁄8"2 2" 2 7 ⁄82 1 ⁄2 2 1 ⁄2" 3 1 ⁄2"3 3" 4 1 ⁄4"3 1 ⁄2 3 1 ⁄2" 5"4 4" 5 3 ⁄4"4 1 ⁄2 4 5 ⁄8" 6 3 ⁄8"5 5 1 ⁄8" 7 1 ⁄8"5 1 ⁄2 5 5 ⁄8" 7 7 ⁄8"6 6 1 ⁄8" 8 1 ⁄2"6 1 ⁄2 6 5 ⁄8" 9 1 ⁄4"7 7 1 ⁄8" 9 7 ⁄8"7 1 ⁄2 7 5 ⁄8" 10 5 ⁄8"8 8 1 ⁄8" 11 3 ⁄8"8 1 ⁄2 8 5 ⁄8" 12"9 9 1 ⁄8" 12 3 ⁄4"9 1 ⁄2 9 5 ⁄8" 13 1 ⁄2"10 10 1 ⁄8" 14 1 ⁄4"10 1 ⁄2 10 3 ⁄4" 14 7 ⁄8"11 11 1 ⁄4" 15 5 ⁄8"11 1 ⁄2 11 3 ⁄4" 16 3 ⁄8"RafterThicknessSpacingIn.Jack RafterLength1 1"2 2"3 3"4 4"5 5 1 ⁄8"6 6 1 ⁄8"7 7 1 ⁄8"8 8 1 ⁄8"9 9 1 ⁄8"10 10 1 ⁄8"11 11 1 ⁄8"12 1' 0 1 ⁄8"13 1' 1 1 ⁄8"14 1' 2 1 ⁄4"15 1' 3 1 ⁄4"16 1' 4 1 ⁄4"17 1' 5 1 ⁄4"18 1' 6 1 ⁄4"19 1' 7 1 ⁄4"20 1' 8 1 ⁄4"21 1' 9 1 ⁄4"22 1' 10 1 ⁄4"23 1' 11 3 ⁄8"24 2' 0 3 ⁄8"Miter Allowance forHip and Valley RaftersRafterDepth1 1 ⁄2" 3⁄4" 3 1 ⁄2" 9⁄16"1 5 ⁄8"13⁄16" 5 1 ⁄2"15⁄16"1 3 ⁄4" 7⁄8" 7 1 ⁄4" 1 3 ⁄16"1 7 ⁄8"15⁄16" 9 1 ⁄4" 1 9 ⁄16"BottomAllowance