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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8 INCH RISE 8-12 PITCH 33 3 ⁄4 DEGREESCommon<strong>Rafter</strong>LengthHip or Val.<strong>Rafter</strong>LengthRun Ft.1 1' 2 3 ⁄8" 1' 6 3 ⁄4"2 2' 4 7 ⁄8" 3' 1 1 ⁄2"3 3' 7 1 ⁄4" 4' 8 1 ⁄4"4 4' 9 3 ⁄4" 6' 3"5 6' 0 1 ⁄8" 7' 9 3 ⁄4"6 7' 2 1 ⁄2" 9' 4 5 ⁄8"7 8' 5" 10' 11 3 ⁄8"8 9' 7 3 ⁄8" 12' 6 1 ⁄8"9 10' 9 3 ⁄4" 14' 0 7 ⁄8"10 12' 0 1 ⁄4" 15' 7 5 ⁄8"11 13' 2 5 ⁄8" 17' 2 3 ⁄8"12 14' 5 1 ⁄8" 18' 9 1 ⁄8"13 15' 7 1 ⁄2" 20' 3 7 ⁄8"14 16' 9 7 ⁄8" 21' 10 5 ⁄8"15 18' 0 3 ⁄8" 23' 5 3 ⁄8"16 19' 2 3 ⁄4" 25' 0 1 ⁄8"17 20' 5 1 ⁄8" 26' 7"18 21' 7 5 ⁄8" 28' 1 3 ⁄4"19 22' 10" 29' 8 1 ⁄2"20 24' 0 1 ⁄2" 31' 3 1 ⁄4"21 25' 2 7 ⁄8" 32' 10"22 26' 5 1 ⁄4" 34' 4 3 ⁄4"23 27' 7 3 ⁄4" 35' 11 1 ⁄2"24 28' 10 1 ⁄8" 37' 6 1 ⁄4"25 30' 0 1 ⁄2" 39' 1"Common<strong>Rafter</strong>Length31Hip or Val.<strong>Rafter</strong>LengthRun In.1⁄25⁄8" 3⁄4"1 1 1 ⁄4" 1 5 ⁄8"1 1 ⁄2 1 3 ⁄4" 2 3 ⁄8"2 2 3 ⁄8" 3 1 ⁄8"2 1 ⁄2 3" 3 7 ⁄8"3 3 5 ⁄8" 4 3 ⁄4"3 1 ⁄2 4 1 ⁄4" 5 1 ⁄2"4 4 3 ⁄4" 6 1 ⁄4"4 1 ⁄2 5 3 ⁄8" 7"5 6" 7 7 ⁄8"1⁄2 6 5 ⁄8" 8 5 ⁄8"6 7 1 ⁄4" 9 3 ⁄8"6 1 ⁄2 7 7 ⁄8" 10 1 ⁄8"7 8 1 ⁄2" 11"7 1 ⁄2 9" 11 3 ⁄4"8 9 5 ⁄8" 12 1 ⁄2"8 1 ⁄2 10 1 ⁄4" 13 1 ⁄4"9 10 7 ⁄8" 14 1 ⁄8"9 1 ⁄2 11 1 ⁄2" 14 7 ⁄8"10 12" 15 5 ⁄8"10 1 ⁄2 12 5 ⁄8" 16 3 ⁄8"11 13 1 ⁄4" 17 1 ⁄4"11 1 ⁄2 13 7 ⁄8" 18"SpacingIn.Jack <strong>Rafter</strong>Length1 1 1 ⁄4"2 2 3 ⁄8"3 3 5 ⁄8"4 4 3 ⁄4"5 6"6 7 1 ⁄4"7 8 3 ⁄8"8 9 5 ⁄8"9 10 7 ⁄8"10 1' 0"11 1' 1 1 ⁄4"12 1' 2 3 ⁄8"13 1' 3 5 ⁄8"14 1' 4 7 ⁄8"15 1' 6"16 1' 7 1 ⁄4"17 1' 8 3 ⁄8"18 1' 9 5 ⁄8"19 1' 10 7 ⁄8"20 2' 0"21 2' 1 1 ⁄4"22 2' 2 1 ⁄2"23 2' 3 5 ⁄8"24 2' 4 7 ⁄8"<strong>Rafter</strong>ThicknessMiter Allowance forHip and Valley <strong>Rafter</strong>s<strong>Rafter</strong>DepthBottomAllowance1 1 ⁄2" 7⁄8" 1 ⁄2" 2 5 ⁄16"1 5 ⁄8" 1" 5 1 ⁄2" 3 11 ⁄16"1 3 ⁄4" 1 1 ⁄16" 7 1 ⁄4" 4 13 ⁄16"1 7 ⁄8" 1 1 ⁄8" 9 1 ⁄4" 6 3 ⁄16"
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