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ROOFING

ROOFING. BCGCA3007B. Types of Roofs. Types of Roofs. Types of Roofs. Problem No1. Problem No1. Exercise 2 – Draw in Hips & Valleys. Exercise 2. Review Principles of Roofing. Ridges are Level Rafters run at 90 to Ridge Hips & Valleys bisect all internal & external Corners

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ROOFING

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  1. ROOFING BCGCA3007B

  2. Types of Roofs

  3. Types of Roofs

  4. Types of Roofs

  5. Problem No1

  6. Problem No1

  7. Exercise 2 – Draw in Hips & Valleys

  8. Exercise 2

  9. Review Principles of Roofing • Ridges are Level • Rafters run at 90 to Ridge • Hips & Valleys bisect all internal & external Corners • Roof members are set out along centerlines

  10. Common Rafter • Main Roofing Member • Calculated same method as Gable • Spaced 450mm to 600mm for Tiled Roofs600mm to 900mm for Sheet Roof • Cut using a Pattern Rafter

  11. Centering Rafter LayoutRoofs are Set out by Centreline Centring Rafters Determine

  12. Centering Rafter Layout

  13. Ridge • Used to centre Rafters • Length = Length – span + Rafter Thickness

  14. Determine Ridge Length

  15. Crown End Rafters • Cut & Fitted Against Ridge • Act as Opposing Braces • Similar to Common Rafter • Half Rafter is Deducted

  16. Crown End Rafter LayoutWhat is Crown End Centreline Length? Crown End Rafters

  17. Crown End Rafter LayoutWhat is the run of Centering Rafter & Crown End Rafter Ridge 140 x19 Rafter 90 x 45 Crown End Rafters

  18. Crown End Rafter LayoutWhat is the run of Centering Rafter & Crown End Rafter Centering Rafters Crown End Rafters Ridge Hip Rafters

  19. Crown End Rafter LayoutWhat is the run of Centering Rafter & Crown End Rafter Ridge 140 x19 Rafter 90 x 45 Centering Rafter Run Crown End Rafter Run

  20. Crown End & Centering Rafter • Run Crown End Rafter = Half Span – Half Rafter Width • Run Centering Rafter = Half Span – Half Ridge Width

  21. Hip Rafter • Runs From Corner to Intersection Crown End & Centering Rafter - Centerline • Hips Bisect Corners • Fixing and Locating of Creepers • Distance above Birdsmouth is same as common rafters

  22. Hip Rafter LayoutRoofs are Set out by Centerline Bisects Corner Hip in Plan

  23. Hip Rafter Span of Hip

  24. Hip Rafter Hip Run Hip Span

  25. Hip Rafter Hip Run Hip Span

  26. Hip Rafter Hip Run Hip Span

  27. Hip Rafter Corner Trimmed to allow a better fit Hip Run Hip Span

  28. Hip Rafter

  29. Centering Rafter LayoutRoofs are Set out by Centerline Bisects Corner Determine Centreline Span of Hip

  30. Centreline Span of Hip (Z) X = Half span = 2070 Z = √(x2) + (x2) = √(20702) + (20702) Z = 2927 X = Half span = 2070 Z = Half span x √2 Z = 2927

  31. Centreline Span of Hip (Z) X = Half span = 2070 Z = √(x2) + (x2) = √(20702) + (20702) Z = 2927 X = Half span = 2070 Z = Half span x √2 Z = 2927

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