Octagonal Roof
Draw Crown Rafters Walls are parallel Set  Back ½ Rafter Thickness
Draw & Bisect Crown End Rafter
Draw Tangents to the Crown Ends
Draw Top Plate
Clean Up Drawing
Clean Up Drawing Angle Between Major Crown End & Centring Rafters = 90 ⁰
Clean Up Drawing Angle Between Crown End Rafters = 45 ⁰
Clean Up Drawing Angle Between Crowns Ends & Hips = 22.5 ⁰
Angles formed by the Roof These angles are the same no matter the size of Roof as it is a Geometric Shape
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 o...
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 Spa...
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 ...
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 ...
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 ...
Major Crown End Rafter These formulas are the same no matter the size of the Roof Calculating Centring rafters and Crown E...
Major Crown End Rafter These formulas are the same no matter the size of the Roof Calculating Centring rafters and Crown E...
Minor Crown End Rafters These formulas are the same no matter the size of the Roof Minor Crown End Rafters join in a simil...
Minor Crown End Rafters These formulas are the same no matter the size of the Roof Minor Crown End Rafters join in a simil...
Minor Crown End Rafters These formulas are the same no matter the size of the Roof Minor Crown End Rafters join in a simil...
Edge Bevel Minor Crown End Rafters Plan Angle = 45 ⁰
Edge Bevel Minor Crown End Rafters Plan Angle Plan Angle = 45 ⁰ Plan Angle = 90 ⁰
Edge Bevel Minor Crown End Rafters Plan Angle Plan Angle = 45 ⁰ Plan Angle = 90 ⁰ Both Sides Must Be Equal
Edge Bevel Minor Crown End Rafters Plan Angle Plan Angle = 45 ⁰ Plan Angle = 90 ⁰ Both Sides Must Be Equal When Can You Us...
Edge Bevel Minor Crown End Rafters True Angle
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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

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