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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21 INCH RISE 21-12 PITCH 60 1 ⁄4 DEGREESCommon<strong>Rafter</strong>LengthHip or Val.<strong>Rafter</strong>LengthRun Ft.1 2' 0 1 ⁄8" 2' 3"2 4' 0 3 ⁄8" 4' 6"3 6' 0 1 ⁄2" 6' 9"4 8' 0 3 ⁄4" 9' 0"5 10' 0 7 ⁄8" 11' 3"6 12' 1 1 ⁄8" 13' 6"7 14' 1 1 ⁄4" 15' 9"8 16' 1 1 ⁄2" 18' 0"9 18' 1 5 ⁄8" 20' 3"10 20' 1 7 ⁄8" 22' 6"11 22' 2" 24' 9"12 24' 2 1 ⁄4" 27' 0"13 26' 2 3 ⁄8" 29' 3"14 28' 2 5 ⁄8" 31' 6"15 30' 2 3 ⁄4" 33' 9"16 32' 3" 36' 0"17 34' 3 1 ⁄8" 38' 3"18 36' 3 3 ⁄8" 40' 6"19 38' 3 1 ⁄2" 42' 9"20 40' 3 3 ⁄4" 45' 0"21 42' 3 7 ⁄8" 47' 3"22 44' 4 1 ⁄8" 49' 6"23 46' 4 1 ⁄4" 51' 9"24 48' 4 1 ⁄2" 54' 0"25 50' 4 5 ⁄8" 56' 3"Common<strong>Rafter</strong>Length44Hip or Val.<strong>Rafter</strong>LengthRun In.1⁄2 1" 1 1 ⁄8"1 2" 2 1 ⁄4"1 1 ⁄2 3" 3 3 ⁄8"2 4" 4 1 ⁄2"2 1 ⁄2 5" 5 5 ⁄8"3 6" 6 3 ⁄4"3 1 ⁄2 7" 7 7 ⁄8"4 8 1 ⁄8" 8 3 ⁄4"4 1 ⁄2 9 1 ⁄8" 9"5 10 1 ⁄8" 10 1 ⁄8"5 1 ⁄2 11 1 ⁄8" 11 1 ⁄4"6 12 1 ⁄8" 12 3 ⁄8"6 1 ⁄2 13 1 ⁄8" 13 1 ⁄2"7 14 1 ⁄8" 14 5 ⁄8"7 1 ⁄2 15 1 ⁄8" 15 3 ⁄4"8 16 1 ⁄8" 16 7 ⁄8"8 1 ⁄2 17 1 ⁄8" 18"9 18 1 ⁄8" 19 1 ⁄8"9 1 ⁄2 19 1 ⁄8" 20 1 ⁄4"10 20 1 ⁄4" 21 1 ⁄8"10 1 ⁄2 21 1 ⁄4" 21 3 ⁄8"11 22 1 ⁄4" 22 1 ⁄2"11 1 ⁄2 23 1 ⁄4" 23 5 ⁄8"SpacingIn.Jack <strong>Rafter</strong>Length1 2"2 4"3 6"4 8 1 ⁄8"5 10 1 ⁄8"6 1' 0 1 ⁄8"7 1' 2 1 ⁄8"8 1' 4 1 ⁄8"9 1' 6 1 ⁄8"10 1' 8 1 ⁄8"11 1' 10 1 ⁄8"12 2' 0 1 ⁄4"13 2' 2 1 ⁄4"14 2' 4 1 ⁄4"15 2' 6 1 ⁄4"16 2' 8 1 ⁄4"17 2' 10 1 ⁄4"18 3' 0 1 ⁄4"19 3' 2 1 ⁄4"20 3' 4 3 ⁄8"21 3' 6 3 ⁄8"22 3' 8 3 ⁄8"23 3' 10 3 ⁄8"24 4' 0 3 ⁄8"<strong>Rafter</strong>ThicknessMiter Allowance forHip and Valley <strong>Rafter</strong>s<strong>Rafter</strong>DepthBottomAllowance1 1 ⁄2" 1 1 ⁄2" 3 1 ⁄2" 6 1 ⁄8"1 5 ⁄8" 1 5 ⁄8" 5 1 ⁄2" 9 5 ⁄8"1 3 ⁄4" 1 3 ⁄4" 7 1 ⁄4" 12 11 ⁄16"1 7 ⁄8" 1 7 ⁄8" 9 1 ⁄4" 16 3 ⁄16"
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