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

11 INCH RISE 11-12 PITCH 42 1 ⁄2 DEGREESCommonRafterLengthHip or Val.RafterLengthRun Ft.1 1' 4 1 ⁄4" 1' 8 1 ⁄4"2 2' 8 1 ⁄2" 3' 4 1 ⁄2"3 4' 0 7 ⁄8" 5' 0 5 ⁄8"4 5' 5 1 ⁄8" 6' 8 7 ⁄8"5 6' 9 3 ⁄8" 8' 5 1 ⁄8"6 8' 1 5 ⁄8" 10' 1 3 ⁄8"7 9' 6" 11' 9 5 ⁄8"8 10' 10 1 ⁄4" 13' 5 3 ⁄4"9 12' 2 1 ⁄2" 15' 2"10 13' 6 3 ⁄4" 16' 10 1 ⁄4"11 14' 11" 18' 6 1 ⁄2"12 16' 3 3 ⁄8" 20' 2 3 ⁄4"13 17' 7 5 ⁄8" 21' 10 7 ⁄8"14 18' 11 7 ⁄8" 23' 7 1 ⁄8"15 20' 4 1 ⁄8" 25' 3 3 ⁄8"16 21' 8 1 ⁄2" 26' 11 5 ⁄8"17 23' 0 3 ⁄4" 28' 7 3 ⁄4"18 24' 5" 30' 4"19 25' 9 1 ⁄4" 32' 0 1 ⁄4"20 27' 1 1 ⁄2" 33' 8 1 ⁄2"21 28' 5 7 ⁄8" 35' 4 3 ⁄4"22 29' 10 1 ⁄8" 37' 0 7 ⁄8"23 31' 2 3 ⁄8" 38' 9 1 ⁄8"24 32' 6 5 ⁄8" 40' 5 3 ⁄8"25 33' 11" 42' 1 5 ⁄8"CommonRafterLength34Hip or Val.RafterLengthRun In.1⁄25⁄8" 7⁄8"1 1 3 ⁄8" 1 5 ⁄8"1 1 ⁄2 2" 2 1 ⁄2"2 2 3 ⁄4" 3 3 ⁄8"2 1 ⁄2 3 3 ⁄8" 4 1 ⁄4"3 4 1 ⁄8" 5"3 1 ⁄2 4 3 ⁄4" 5 7 ⁄8"4 5 3 ⁄8" 6 3 ⁄4"4 1 ⁄2 6 1 ⁄8" 7 5 ⁄8"5 6 3 ⁄4" 8 3 ⁄8"5 1 ⁄2 7 1 ⁄2" 9 1 ⁄4"6 8 1 ⁄8" 10 1 ⁄8"6 1 ⁄2 8 3 ⁄4" 11"7 9 1 ⁄2" 11 3 ⁄4"7 1 ⁄2 10 1 ⁄8" 12 5 ⁄8"8 10 7 ⁄8" 13 1 ⁄2"8 1 ⁄2 11 1 ⁄2" 14 3 ⁄8"9 12 1 ⁄4" 15 1 ⁄8"9 1 ⁄2 12 7 ⁄8" 16"10 13 1 ⁄2" 16 7 ⁄8"10 1 ⁄2 14 1 ⁄4" 17 3 ⁄4"11 14 7 ⁄8" 18 1 ⁄2"11 1 ⁄2 15 5 ⁄8" 19 3 ⁄8"RafterThicknessSpacingIn.Jack RafterLength1 1 3 ⁄8"2 2 3 ⁄4"3 4 1 ⁄8"4 5 3 ⁄8"5 6 3 ⁄4"6 8 1 ⁄8"7 9 1 ⁄2"8 10 7 ⁄8"9 1' 0 1 ⁄4"10 1' 1 5 ⁄8"11 1' 2 7 ⁄8"12 1' 4 1 ⁄4"13 1' 5 5 ⁄8"14 1' 7"15 1' 8 3 ⁄8"16 1' 9 3 ⁄4"17 1' 11"18 2' 0 3 ⁄8"19 2' 1 3 ⁄4"20 2' 3 1 ⁄8"21 2' 4 1 ⁄2"22 2' 5 7 ⁄8"23 2' 7 1 ⁄4"24 2' 8 1 ⁄2"Miter Allowance forHip and Valley RaftersRafterDepth1 1 ⁄2" 1" 3 1 ⁄2" 3 3 ⁄16"1 5 ⁄8" 1 1 ⁄8" 5 1 ⁄2" 5 1 ⁄16"1 3 ⁄4" 1 3 ⁄16" 7 1 ⁄4" 6 5 ⁄8"1 7 ⁄8" 1 1 ⁄4" 9 1 ⁄4" 8 1 ⁄2"BottomAllowance