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# CPCCCA3009A Construct Advanced Roofs Octagonal end roof

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### CPCCCA3009A Construct Advanced Roofs Octagonal end roof

1. 1. Octagonal Roof
2. 2. Draw Crown Rafters Walls are parallel Set Back ½ Rafter Thickness
3. 3. Draw & Bisect Crown End Rafter
4. 4. Draw Tangents to the Crown Ends
5. 5. Draw Top Plate
6. 6. Clean Up Drawing
7. 7. Clean Up Drawing Angle Between Major Crown End & Centring Rafters = 90 ⁰
8. 8. Clean Up Drawing Angle Between Crown End Rafters = 45 ⁰
9. 9. Clean Up Drawing Angle Between Crowns Ends & Hips = 22.5 ⁰
10. 10. Angles formed by the Roof These angles are the same no matter the size of Roof as it is a Geometric Shape
11. 11. Length Of Octagonal Ends If the angle between the members is constant 22.5 ⁰ We can say in all cases, no matter the size of the roof ½ End = ½ Span x tan 22.5⁰ = ½ Span x 0.414 (tan 22.5⁰ is always used)
12. 12. If the angle between the members is constant 22.5 ⁰ We can say in all cases, no matter the size of the roof ½ End = ½ Span x 0.414 Length Of Octagonal Ends
13. 13. Length Of Octagonal Ends If the angle between the members is constant 22.5 ⁰ In all cases, we can say Full End = ½ Span x 0.414 x 2
14. 14. Length Of Octagonal Ends If the angle between the members is constant 22.5 ⁰ Also in all cases, the full end will be Full End = ½ Span x 0.828
15. 15. Length Of Octagonal Ends These formulas are the same no matter the size of the Roof ½ End = ½ Span x 0.414 Full End = ½ Span x 0.828
16. 16. Major Crown End Rafter These formulas are the same no matter the size of the Roof Calculating Centring rafters and Crown End Rafter use the same method as a normal hip roof
17. 17. Major Crown End Rafter These formulas are the same no matter the size of the Roof Calculating Centring rafters and Crown End Rafter use the same method as a normal hip roof
18. 18. Minor Crown End Rafters These formulas are the same no matter the size of the Roof Minor Crown End Rafters join in a similar manner to a hip rafter
19. 19. Minor Crown End Rafters These formulas are the same no matter the size of the Roof Minor Crown End Rafters join in a similar manner to a hip rafter The Plan run of the minor crown is reduced by ; ½ Centring Rafter x 1.414
20. 20. Minor Crown End Rafters These formulas are the same no matter the size of the Roof Minor Crown End Rafters join in a similar manner to a hip rafter Minor Crown = ½ Span x ½ C.R Thickness÷
21. 21. Edge Bevel Minor Crown End Rafters Plan Angle = 45 ⁰
22. 22. Edge Bevel Minor Crown End Rafters Plan Angle Plan Angle = 45 ⁰ Plan Angle = 90 ⁰
23. 23. Edge Bevel Minor Crown End Rafters Plan Angle Plan Angle = 45 ⁰ Plan Angle = 90 ⁰ Both Sides Must Be Equal
24. 24. Edge Bevel Minor Crown End Rafters Plan Angle Plan Angle = 45 ⁰ Plan Angle = 90 ⁰ Both Sides Must Be Equal When Can You Use The Plan For the Edge Bevel ?
25. 25. Edge Bevel Minor Crown End Rafters True Angle