42 Sided Polygon Rafter Table ( 42 - gon )
central angle = 8.57142857142857°
working angle = 4.28571428571429°
plan angle = 85.7142857142857°
miter angle = 0.90 & 12 (4.29°)
hip run per foot = 12.03
apothem multiplier = 1.00280
side wall multiplier = 0.14988
Pitch |
Roof Angles |
Frieze Block Angles |
Hip Rafters |
Jack Rafters |
|||||||||||||
Roof Pitch Angle |
Hip Pitch Angle |
Angle |
Saw Bevel |
Side Cut Angle |
Backing Angle |
Hip Drop 2x |
Hip Drop 4x |
Length Per-FT |
Side Cut Angle |
First |
First |
First |
Spaced |
Spaced |
Spaced |
Multiplier |
|
0 |
|
0.00 |
|
|
4.29 |
0.00 |
0.00 |
0.00 |
12.03 |
4.28571428571429 |
170.11 |
223.49 |
330.24 |
160.13 |
213.51 |
320.26 |
13.34407 |
1 |
|
4.75 |
|
|
4.27 |
0.36 |
0.00 |
0.01 |
12.08 |
4.27 |
170.70 |
224.26 |
331.38 |
160.68 |
214.25 |
321.37 |
13.39033 |
2 |
|
9.44 |
|
|
4.23 |
0.70 |
0.01 |
0.02 |
12.20 |
4.23 |
172.46 |
226.57 |
334.79 |
162.34 |
216.45 |
324.68 |
13.52814 |
3 |
|
14.00 |
|
|
4.16 |
1.04 |
0.01 |
0.03 |
12.40 |
4.16 |
175.34 |
230.36 |
340.40 |
165.06 |
220.08 |
330.11 |
13.75476 |
4 |
|
18.39 |
|
|
4.07 |
1.35 |
0.02 |
0.04 |
12.68 |
4.07 |
179.31 |
235.57 |
348.10 |
168.79 |
225.05 |
337.58 |
14.06589 |
5 |
|
22.56 |
|
|
3.96 |
1.65 |
0.02 |
0.05 |
13.03 |
3.96 |
184.28 |
242.11 |
357.76 |
173.47 |
231.30 |
346.95 |
14.45608 |
6 |
|
26.50 |
|
|
3.84 |
1.92 |
0.03 |
0.07 |
13.45 |
3.83 |
190.19 |
249.86 |
369.22 |
179.03 |
238.71 |
358.06 |
14.91913 |
7 |
|
30.19 |
|
|
3.71 |
2.16 |
0.03 |
0.08 |
13.92 |
3.70 |
196.94 |
258.73 |
382.32 |
185.38 |
247.18 |
370.76 |
15.44848 |
8 |
|
33.62 |
|
|
3.57 |
2.38 |
0.04 |
0.09 |
14.45 |
3.57 |
204.45 |
268.60 |
396.90 |
192.45 |
256.60 |
384.90 |
16.03758 |
9 |
|
36.79 |
|
|
3.43 |
2.57 |
0.04 |
0.10 |
15.03 |
3.43 |
212.64 |
279.36 |
412.80 |
200.16 |
266.88 |
400.32 |
16.68009 |
10 |
|
39.73 |
|
|
3.30 |
2.74 |
0.05 |
0.11 |
15.65 |
3.29 |
221.43 |
290.91 |
429.87 |
208.44 |
277.92 |
416.88 |
17.37009 |
11 |
|
42.43 |
|
|
3.17 |
2.89 |
0.05 |
0.12 |
16.30 |
3.16 |
230.76 |
303.17 |
447.99 |
217.23 |
289.63 |
434.45 |
18.10215 |
12 |
|
44.92 |
|
|
3.04 |
3.03 |
0.06 |
0.13 |
16.99 |
3.03 |
240.57 |
316.06 |
467.03 |
226.46 |
301.94 |
452.91 |
18.87137 |
13 |
|
47.21 |
|
|
2.91 |
3.15 |
0.06 |
0.14 |
17.71 |
2.91 |
250.79 |
329.49 |
486.88 |
236.08 |
314.77 |
472.16 |
19.67340 |
14 |
|
49.32 |
|
|
2.80 |
3.25 |
0.07 |
0.15 |
18.46 |
2.79 |
261.39 |
343.41 |
507.44 |
246.05 |
328.07 |
492.11 |
20.50438 |
15 |
|
51.26 |
|
|
2.68 |
3.35 |
0.07 |
0.16 |
19.23 |
2.68 |
272.31 |
357.75 |
528.64 |
256.33 |
341.78 |
512.66 |
21.36094 |
16 |
|
53.05 |
|
|
2.58 |
3.43 |
0.07 |
0.17 |
20.02 |
2.57 |
283.51 |
372.48 |
550.40 |
266.88 |
355.84 |
533.76 |
22.24012 |
17 |
|
54.71 |
|
|
2.48 |
3.50 |
0.08 |
0.19 |
20.83 |
2.47 |
294.98 |
387.54 |
572.65 |
277.67 |
370.23 |
555.34 |
23.13935 |
18 |
|
56.24 |
|
|
2.38 |
3.56 |
0.08 |
0.20 |
21.65 |
2.38 |
306.67 |
402.89 |
595.34 |
288.68 |
384.90 |
577.35 |
24.05637 |
19 |
|
57.65 |
|
|
2.30 |
3.62 |
0.09 |
0.21 |
22.49 |
2.29 |
318.56 |
418.52 |
618.43 |
299.87 |
399.83 |
599.74 |
24.98923 |
20 |
|
58.97 |
|
|
2.21 |
3.67 |
0.09 |
0.22 |
23.34 |
2.21 |
330.63 |
434.38 |
641.87 |
311.23 |
414.98 |
622.47 |
25.93622 |
21 |
|
60.19 |
|
|
2.13 |
3.72 |
0.10 |
0.23 |
24.20 |
2.13 |
342.87 |
450.45 |
665.62 |
322.75 |
430.33 |
645.50 |
26.89584 |
22 |
|
61.32 |
|
|
2.06 |
3.76 |
0.10 |
0.24 |
25.08 |
2.06 |
355.24 |
466.71 |
689.64 |
334.40 |
445.87 |
668.80 |
27.86679 |
23 |
|
62.38 |
|
|
1.99 |
3.80 |
0.11 |
0.25 |
25.96 |
1.99 |
367.75 |
483.14 |
713.93 |
346.18 |
461.57 |
692.35 |
28.84793 |
24 |
|
63.37 |
|
|
1.92 |
3.83 |
0.11 |
0.26 |
26.85 |
1.92 |
380.37 |
499.73 |
738.43 |
358.06 |
477.41 |
716.12 |
29.83825 |
Framing Square usage Example: 8:12 Pitch
(Rafter Length Per Ft = 14.42) (Hip Rafter Length Per Ft = 14.45)
SS Angle = Speed Square Angle
Saw Angle produces compound Speed Square Angle
Tongue (8.00) Blade (12.00) for Rafter Plumb Cut Angle (SS Angle 33.69)
Tongue (12.00) Blade (8.00) for Rafter Level Cut Angle (SS Angle 56.31)
Tongue (8.00) Blade (12.03) for Hip Rafter Plumb Cut Angle (SS Angle 33.62)
Tongue (12.03) Blade (8.00) for Hip Rafter Level Cut Angle (SS Angle 56.38)
Tongue (0.90) Blade (14.45) for Hip Side Cut Angle (SS Angle 3.57) (Saw Angle 85.71)
Tongue (0.60) Blade (14.45) for Hip Backing Angle (SS Angle 2.38)
Tongue (0.90) Blade (14.42) for Jack Rafter Side Cut Angle (SS Angle 3.57) (Saw Angle 85.71)
Tongue (0.60) Blade (14.42) for Purlin Rafter Plumb Cut Angle (SS Angle 2.38) (Saw Angle 2.38)
Tongue (0.90) Blade (14.42) for Purlin Rafter Cross Cut Angle (SS Angle 3.57)
Tongue (0.60) Blade (14.42) for Roof Sheathing Plumb Cut Angle (SS Angle 2.38) (Saw Angle 2.38)
Tongue (0.90) Blade (14.42) for Roof Sheathing Cross Cut Angle (SS Angle 3.57)
Tongue (8.00) Blade (12.00) for Miter Box Gable Mould Plumb Cut Angle (SS Angle 33.69)
Tongue (8.00) Blade (12.03) for Miter Box 2 Cord Polygon Gable Mould Hip Plumb Cut Angle (SS Angle 33.62)
Tongue (0.90) Blade (12.00) for Miter Box 2 Cord Polygon Gable Mould Hip Cross Cut Angle (SS Angle 4.29) (Saw Angle 4.29)
Tongue (0.60) Blade (14.42) for Frieze Block Plumb Cut Angle (SS Angle 2.38)
Tongue (0.90) Blade (14.42) for Frieze Block Cross Cut Angle (SS Angle 3.57) (Saw Angle 3.56)
Tongue (0.60) Blade (14.42) for Square Cut Fascia Plumb Cut Angle (SS Angle 2.38)
Tongue (0.90) Blade (14.42) for Square Cut Fascia Cross Cut Angle (SS Angle 3.57) (Saw Angle 3.56)
Tongue (0.03) Blade (0.90) for Hip Rafter Square Cut Fascia Plumb Cut Angle (SS Angle 0.15)
Tongue (0.90) Blade (14.42) for Hip Rafter Square Cut Fascia Cross Cut Angle (SS Angle 3.57) (Saw Bevel Angle 3.56)