HIP ROOFING

1. HIP ROOFING BCGCA3007B

2. Common Rafter • For a detailed explanation of determining the common rafter, review the “Gable Roof Presentation”

3. Problem No1Lets warm your brain up Calculate Underside of Beams Birdsmouth 30mm Rafter 140 x 45

4. Problem No1 Calculate Underside of Beams

5. Review Principles of Roofing • Ridges are Level • Rafters run at 90⁰ to Wall Plate • Hips & Valleys bisect all internal & external Corners • Roof members are set out along centerlines

6. Ridges are Level

7. Golden Principles of Roofing • Ridges are Level • Rafters run at 90⁰ to Wall Plate • Hips & Valleys bisect all internal & external Corners • Roof members are set out along centerlines

8. Rafters at 90° to top plate

9. Golden Principles of Roofing • Ridges are Level • Rafters run at 90⁰ to Wall Plate • Hips & Valleys bisect all internal & external Corners • Roof members are set out along centerlines

10. Hips & Valleys bisect all internal & external Corners

11. Golden Principles of Roofing • Ridges are Level • Rafters run at 90⁰ to Wall Plate • Hips & Valleys bisect all internal & external Corners • Roof members are set out along centerlines

12. Roof members are set out along centerlines

13. Types of Roofs

14. Types of Roofs

15. Types of Roofs

27. Exercise 2 – Draw in Hips & Valleys

28. Exercise 2

34. Hips & Valleys always Bisect Corners

35. Splay End Hip Hips & Valleys always Bisect Corners This also applies to complex roofs we will construct in Stage 3

36. Review Principles of Roofing • Ridges are Level • Rafters run at 90⁰ to Wall Plate • Hips & Valleys bisect all internal & external Corners • Roof members are set out along centerlines

37. Centreline Plan Length of Hip (Z) Roofs are ALWAYS set out along the centrelines of the Roof Members This is an absolute fundamental to understanding complex roofs X = Half span = 2070 Z = √(x2) + (x2) = √(20702) + (20702) Z = 2927 X = Half span = 2070 Z = Half span x √2 Z = 2927

38. Determining Hip Roof Members

40. Common Rafter • Main Roofing Member • Calculated same method as Gable • Spaced Usually at 450mm to 600mm for Tiled Roofs & 600mm to 900mm for Sheet Roof • This is dependant on span tables found in AS 1684.2 • Cut using a Pattern Rafter

41. Determine Common Rafter

42. Determine Common Rafter

43. Step 1 - Solve 1m Triangle 1.103 0.466 25° 1 Rise = 1 x Tan 25° = 0.466 Rafter Length / m = 1 ÷ Cos 25° = 1.103

44. Step 1 - Solve 1m Triangle 1.103 0.466 25° 1 Rise = 1 x Tan 25° = 0.466 Rafter Length / m = 1 ÷ Cos 25° = 1.103

45. Determine Centreline Length Ridge

46. Step 2 – Determine Plan LengthCentreline Length 1.103 0.466 25° • (1/2 Span) • Plan Length 1 Plan Length= 2070

47. Step 3 – Determine Rafter LengthCentreline Length 2283 1.103 0.466 25° • (1/2 Span) • Plan Length 1 Rafter Length = Plan Length x Rafter Length per metre (RL/m) Rafter Length = 2070 x 1.103 Rafter Length = 2283

48. Step 4 – Determine Rise(If Required) Centreline Length 2283 964 1.103 0.466 25° • (1/2 Span) • Plan Length 1 Total Rise = Horizontal Travel x Rise per metre Total Rise = 2070 x 0.466 Total Rise = 964

49. Determine True Length

50. Step 2 – Determine Plan LengthTrue Length Ridge 190 x 19 1.103 0.466 25° 2060.5 Plan Length ½ Ridge = 9.5mm 1 Plan Length = Distance from Top Plate to Edge of Ridge Plan Length = ½ Span – ½ Ridge Thickness Plan Length = 2070 – 9.5 Plan Length = 2060.5