IRWIN® Rafter Square Reference Guide Complete Instruction Book ...
IRWIN® Rafter Square Reference Guide Complete Instruction Book ...
IRWIN® Rafter Square Reference Guide Complete Instruction Book ...
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4 INCH RISE 4-12 PITCH 18 1 ⁄2 DEGREESCommon<strong>Rafter</strong>LengthHip or Val.<strong>Rafter</strong>LengthRun Ft.1 1' 0 5 ⁄8" 1' 5 3 ⁄8"2 2' 1 1 ⁄4" 2' 10 7 ⁄8"3 3' 2" 4' 4 1 ⁄4"4 4' 2 5 ⁄8" 5' 9 3 ⁄4"5 5' 3 1 ⁄4" 7' 3 1 ⁄8"6 6' 3 7 ⁄8" 8' 8 5 ⁄8"7 7' 4 1 ⁄2" 10' 2"8 8' 5 1 ⁄4" 11' 7 1 ⁄2"9 9' 5 7 ⁄8" 13' 0 7 ⁄8"10 10' 6 1 ⁄2" 14' 6 3 ⁄8"11 11' 7 1 ⁄8" 15' 11 3 ⁄4"12 12' 7 3 ⁄4" 17' 5 1 ⁄4"13 13' 8 1 ⁄2" 18' 10 5 ⁄8"14 14' 9 1 ⁄8" 20' 4 1 ⁄8"15 15' 9 3 ⁄4" 21' 9 1 ⁄2"16 16' 10 3 ⁄8" 23' 3"17 17' 11" 24' 8 3 ⁄8"18 18' 11 5 ⁄8" 26' 1 7 ⁄8"19 20' 0 3 ⁄8" 27' 7 1 ⁄4"20 21' 1" 29' 0 3 ⁄4"21 22' 1 5 ⁄8" 30' 6 1 ⁄8"22 23' 2 1 ⁄4" 31' 11 5 ⁄8"23 24' 3" 33' 5"24 25' 3 5 ⁄8" 34' 10 1 ⁄2"25 26' 4 1 ⁄4" 36' 3 7 ⁄8"Common<strong>Rafter</strong>Length27Hip or Val.<strong>Rafter</strong>LengthRun In.1⁄21⁄2" 3⁄4"1 1" 1 1 ⁄2"1 1 ⁄2 1 5 ⁄8" 2 1 ⁄8"2 2 1 ⁄8" 2 7 ⁄8"2 1 ⁄2 2 5 ⁄8" 3 5 ⁄8"3 3 1 ⁄8" 4 3 ⁄8"3 1 ⁄2 3 3 ⁄4" 5 1 ⁄8"4 4 1 ⁄4" 5 3 ⁄4"4 1 ⁄2 4 3 ⁄4" 6 1 ⁄2"5 5 1 ⁄4" 7 1 ⁄4"5 1 ⁄2 5 3 ⁄4" 8"6 6 3 ⁄8" 8 3 ⁄4"6 1 ⁄2 6 7 ⁄8" 9 1 ⁄2"7 7 3 ⁄8" 10 1 ⁄4"7 1 ⁄2 8" 10 7 ⁄8"8 8 1 ⁄2" 11 5 ⁄8"8 1 ⁄2 9" 12 3 ⁄8"9 9 1 ⁄2" 13 1 ⁄8"9 1 ⁄2 10 1 ⁄8" 13 7 ⁄8"10 10 5 ⁄8" 14 1 ⁄2"10 1 ⁄2 11 1 ⁄8" 15 1 ⁄4"11 11 5 ⁄8" 16"11 1 ⁄2 12 1 ⁄8" 16 3 ⁄4"SpacingIn.Jack <strong>Rafter</strong>Length1 1"2 2 1 ⁄8"3 3 1 ⁄8"4 4 1 ⁄4"5 5 1 ⁄4"6 6 3 ⁄8"7 7 3 ⁄8"8 8 3 ⁄8"9 9 1 ⁄2"10 10 1 ⁄2"11 11 5 ⁄8"12 1' 0 5 ⁄8"13 1' 1 3 ⁄4"14 1' 2 3 ⁄4"15 1' 3 3 ⁄4"16 1' 4 7 ⁄8"17 1' 5 7 ⁄8"18 1' 7"19 1' 8"20 1' 9 1 ⁄8"21 1' 10 1 ⁄8"22 1' 11 1 ⁄4"23 2' 0 1 ⁄4"24 2' 1 1 ⁄4"<strong>Rafter</strong>ThicknessMiter Allowance forHip and Valley <strong>Rafter</strong>s<strong>Rafter</strong>DepthBottomAllowance1 1 ⁄2"13⁄16" 3 1 ⁄2" 1 3 ⁄16"1 5 ⁄8" 7⁄8" 5 1 ⁄2" 1 13 ⁄16"1 3 ⁄4"15⁄16" 7 1 ⁄4" 2 7 ⁄16"1 7 ⁄8" 1" 9 1 ⁄4" 3 1 ⁄16"
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