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Octagonal Roof

Octagonal Roof. Notes to this Lesson. This demonstration develops from knowledge gained from the development of Gable & Hip Roofs This PowerPoint does not explain the development of the Basic Roof Members

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Octagonal Roof

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  1. Octagonal Roof

  2. Notes to this Lesson • This demonstration develops from knowledge gained from the development of Gable & Hip Roofs • This PowerPoint does not explain the development of the Basic Roof Members • If you require an understanding of these you should first look at the Gable & Hip Roof presentations

  3. Lesson ParametersTo be Provided by Trainer and used in Confirmation Excercises

  4. Critical Definition • Plan Length • Is the distance a roofing member travels, measured along the base of the Right Angled Triangle that it forms adjacent to the Pitch angle.

  5. Example • In its most common form Pitch Angle

  6. Example • Other Examples Pitch Angle Pitch Angle Pitch Angle Pitch Angle

  7. Hip Rafter per 1m of Common Rafter Plan Length ½ Span ½ Span 22.5° ½ Span Plan Lengths

  8. Confirmation of Learning • Determine which side is the “Plan Length”

  9. Confirmation of Learning - Answer • Determine which side is the “Plan Length”

  10. Confirmation of Learning • What are the Plan Lengths of these triangles?

  11. Confirmation of Learning - Answer Plan Lengths

  12. Confirmation of Learning This Triangle

  13. Confirmation of Learning This Triangle

  14. Octagonal Roof • A Regular Geometric Shape

  15. Roof Members can be Determined

  16. Class Works • On an A3 drawing sheet conduct the following drafting excercise

  17. Determine Set Out Points Gathering Point is ½ Span Back from edge Walls are parallel

  18. Determine Set Out Points This will mean for our Practical Class Exercise, the Gathering Point will be ½ Rafter in from edge of the Table Frame Gathering Point is ½ Span Back from edge Walls are parallel

  19. Drawing Octagonal Roof without Compass

  20. Drawing An Octagonal End Roof Draw 2 Construction Lines to scale to represent the Width of The Building

  21. Drawing An Octagonal End Roof Draw Construction Line To Represent End of Building

  22. Drawing An Octagonal End Roof Draw Construction Line To Represent End of Building This end is not so important

  23. Drawing An Octagonal End Roof Draw a Construction Line Mid Span to Represent the Ridgeline (i.e. Centre Span)

  24. Drawing An Octagonal End Roof Locate Centring Rafters (1/2 Span from end)

  25. Drawing An Octagonal End Roof Find Gathering Point

  26. Drawing An Octagonal End Roof Scribe Semi Circle with ½ Span as Radius

  27. Drawing An Octagonal End Roof Draw in Centring Rafters

  28. Drawing An Octagonal End Roof Draw in Major Crown End

  29. Drawing An Octagonal End Roof Bisect Centring & Crown End Rafters to form Minor Crown End

  30. Drawing An Octagonal End Roof Bisect Centring & Crown End Rafters to form Minor Crown End

  31. Drawing An Octagonal End Roof Extend Lines Perpendicular to Ridge At ½ End Length = ½ Span x 0.414

  32. Drawing An Octagonal End Roof Extend Sides of Building by ½ End Length = ½ Span x 0.414

  33. Drawing An Octagonal End Roof Join up external Lines

  34. Drawing An Octagonal End Roof Draw in Hips

  35. Draw Octagonal End With Compass

  36. Drawing An Octagonal End Roof Draw 2 Construction Lines to scale to represent the Width of The Building

  37. Drawing An Octagonal End Roof Draw Construction Line To Represent End of Building

  38. Drawing An Octagonal End Roof Draw Construction Line To Represent End of Building This end is not so important

  39. Drawing An Octagonal End Roof Draw a Construction Line Mid Span to Represent the Ridgeline (i.e. Centre Span)

  40. Drawing An Octagonal End Roof Locate Centring Rafters (1/2 Span from end)

  41. Drawing An Octagonal End Roof Find Gathering Point

  42. Drawing An Octagonal End Roof Scribe Semi Circle with ½ Span as Radius

  43. Drawing An Octagonal End Roof Draw in Centring Rafters

  44. Drawing An Octagonal End Roof Draw in Major Crown End

  45. Drawing An Octagonal End Roof Bisect Centring & Crown End Rafters to form Minor Crown End

  46. Drawing An Octagonal End Roof Bisect Centring & all Crown End Rafters to form Hip Rafters as extended “Light” Construction Lines

  47. Drawing An Octagonal End Roof Extend Lines Perpendicular to Ridge To intersect with HIP

  48. Drawing An Octagonal End Roof Extend sides of Building To intersect with HIP

  49. Drawing An Octagonal End Roof Clean Up & Draw in HIPS

  50. Drawing An Octagonal End Roof Join up external lines

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