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
12 O.C.

First
16 O.C.

First
24 O.C.

Spaced
12 O.C.

Spaced
16 O.C.

Spaced
24 O.C.

Multiplier

0

0.00

0.00

0

4.28571428571429

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

4.76

4.75

0.36

4.27

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

9.46

9.44

0.71

4.23

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

14.04

14.00

1.04

4.16

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

18.43

18.39

1.36

4.07

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

22.62

22.56

1.65

3.96

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

26.57

26.50

1.92

3.83

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

30.26

30.19

2.16

3.70

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

33.69

33.62

2.38

3.56

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

36.87

36.79

2.57

3.43

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

39.81

39.73

2.75

3.29

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

42.51

42.43

2.90

3.16

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

45.00

44.92

3.03

3.03

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

47.29

47.21

3.15

2.91

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

49.40

49.32

3.26

2.79

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

51.34

51.26

3.35

2.68

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

53.13

53.05

3.43

2.57

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

54.78

54.71

3.50

2.47

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

56.31

56.24

3.57

2.38

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

57.72

57.65

3.63

2.29

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

59.04

58.97

3.68

2.20

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

60.26

60.19

3.72

2.12

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

61.39

61.32

3.76

2.05

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

62.45

62.38

3.80

1.98

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

63.43

63.37

3.83

1.92

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)