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Broken Hip Roof

Broken Hip Roof. Lay out of Broken Hip Roof. Roof Pitch = 25⁰. No new bevels need to be developed. Lay out of Broken Hip Roof. Roof Pitch = 25⁰. All Bevels and edge cuts are the same as a hip roof Broken Hip As Span is not the same the rise will not be the same.

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Broken Hip Roof

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  1. Broken Hip Roof

  2. Lay out of Broken Hip Roof Roof Pitch = 25⁰ No new bevels need to be developed

  3. Lay out of Broken Hip Roof Roof Pitch = 25⁰ All Bevels and edge cuts are the same as a hip roof Broken Hip As Span is not the same the rise will not be the same

  4. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Hip Rafter Minor Span Crown End Minor Span Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Common Rafter Major Span Common Rafter Minor Span Hip Rafter Major Span Valley Rafter Minor Span Centring Rafter Minor Span Crown End Major Span Crippled Centring Rafter Broken Hip Centring Rafter Major Span Gathering Point

  5. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 1000/ Cos 25 = Determine Centreline LengthCommon Rafter Major Span =

  6. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Centreline LengthCommon Rafter Major Span =1103

  7. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 675/ Cos 25 = Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span =

  8. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745

  9. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Tan 25 x 1000 = Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof =

  10. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Tan 25 x 1000 = Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466

  11. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Tan 25 x 675 = Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof =

  12. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315

  13. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 =√(Rafter² + ½ Span²) √(1.103² + 1²) = 1.489 Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315 Hip Length Major Span =

  14. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315 Hip Length Major Span = 1.489

  15. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 =√(Rafter² + ½ Span²) √(0.745² + 0.500²) = 0.897 Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315 Hip Length Major Span = 1.489 Hip Length Minor Span =

  16. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315 Hip Length Major Span = 1.489 Hip Length Minor Span = 0.897

  17. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 =Same as Rise Major Span Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315 Hip Length Major Span = 1.489 Hip Length Minor Span = 0.897 Hip Rise Major Span =

  18. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315 Hip Length Major Span = 1.489 Hip Length Minor Span = 0.897 Hip Rise Major Span = 466

  19. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 =Same as Rise Minor Span Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315 Hip Length Major Span = 1.489 Hip Length Minor Span = 0.897 Hip Rise Major Span = 466 Hip Rise Minor Span =

  20. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315 Hip Length Major Span = 1.489 Hip Length Minor Span = 0.897 Hip Rise Major Span = 466 Hip Rise Minor Span = 315

  21. Lay out of Broken Hip Roof Roof Pitch = 25⁰ = 450/Cos 25 = 497 Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315 Hip Length Major Span = 1.489 Hip Length Minor Span = 0.897 Hip Rise Major Span = 466 Hip Rise Minor Span = 315 Creeper Shortening =

  22. Lay out of Broken Hip Roof Roof Pitch = 25⁰ = Length – (Hip Ends x( ½ Span + ½ Rafter) = 3603 – (2 x (1000+ 17) =1569 Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315 Hip Length Major Span = 1.489 Hip Length Minor Span = 0.897 Hip Rise Major Span = 466 Hip Rise Minor Span = 315 Creeper Shortening = 497 Ridge Major Span

  23. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315 Hip Length Major Span = 1.489 Hip Length Minor Span = 0.897 Hip Rise Major Span = 466 Hip Rise Minor Span = 315 Creeper Shortening = 497 Ridge Major Span = 1569

  24. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 As both spans are the same pitch they are SIMILAR so Creeper Shortening is the same for both spans Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315 Hip Length Major Span = 1.489 Hip Length Minor Span = 0.897 Hip Rise Major Span = 466 Hip Rise Minor Span = 315 Creeper Shortening = 497

  25. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 So the roofing members we have previously looked at are determined the same way Determine Centreline LengthCommon Rafter Major Span = 1103 Common Rafter Minor Span = 745 Rise Main Roof = 466 Rise Minor Roof = 315 Hip Length Major Span = 1.489 Hip Length Minor Span = 0.897 Hip Rise Major Span = 466 Hip Rise Minor Span = 315 Creeper Shortening = 497

  26. Lay out of Broken Hip Roof Roof Pitch = 25⁰ To develop other Roofing Members we need to determine the plan length first Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Crippled Centring Rafter

  27. Lay out of Broken Hip Roof Roof Pitch = 25⁰ To develop other Roofing Members we need to determine the plan length first Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Crippled Centring Rafter Distance Between Ridge Minor Span & Crippled Centring Rafter = Difference Between the two half spans 1000-675 = 325

  28. Lay out of Broken Hip Roof Roof Pitch = 25⁰ To develop other Roofing Members we need to determine the plan length first Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Crippled Centring Rafter We recall that all hips & valleys bisect corners. In this building it means that they are at 45⁰.

  29. Lay out of Broken Hip Roof Roof Pitch = 25⁰ To develop other Roofing Members we need to determine the plan length first Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Crippled Centring Rafter We recall that all hips & valleys bisect corners. In this building it means that they are at 45⁰. Therefore where the Broken Hip intersects the Ridge Minor Span must be 325mm from the Centreline of the Ridge Major Span

  30. Lay out of Broken Hip Roof Roof Pitch = 25⁰ To develop other Roofing Members we need to determine the plan length first Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Crippled Centring Rafter As the valley is at 45⁰ the intersection with the valley must be a further 325mm

  31. Lay out of Broken Hip Roof Roof Pitch = 25⁰ To develop other Roofing Members we need to determine the plan length first Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Crippled Centring Rafter Plan Centreline Length = 2 x (Half Span Major – Half Span Minor) 2 x (1000 – 675)

  32. Lay out of Broken Hip Roof Roof Pitch = 25⁰ To develop other Roofing Members we need to determine the plan length first Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Determine Crippled Centring Rafter Plan Centreline Length = 2 x (Half Span Major – Half Span Minor) 2 x (1000 – 675) = 650

  33. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Develop True Length of Crippled Centring Rafter Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Plan Centreline Length = 650mm Deduct ½ Ridge Thickness = 17.5 mm Deduct/Add Long Point Correction

  34. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Develop True Length of Crippled Centring Rafter Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 • Plan Centreline Length = 650mm • Deduct ½ Ridge Thickness = 17.5 mm • Deduct/Add Long Point Correction • Deduct ½ Hip x 1.414

  35. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Develop True Length of Crippled Centring Rafter Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 • Plan Centreline Length = 650mm • Deduct ½ Ridge Thickness = 17.5 mm • Deduct/Add Long Point Correction • Deduct ½ Hip x 1.414 =25mm • Add ½ Rafter Thickness =

  36. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Develop True Length of Crippled Centring Rafter Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 • Plan Centreline Length = 650mm • Deduct ½ Ridge Thickness = 17.5 mm • Deduct/Add Long Point Correction • Deduct ½ Hip x 1.414 =25mm • Add ½ Rafter Thickness = 17.5 • True Length = 650 – 17.5 – 25 + 17.5 Cos 25

  37. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Develop True Length of Crippled Centring Rafter Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 • Plan Centreline Length = 650mm • Deduct ½ Ridge Thickness = 17.5 mm • Deduct/Add Long Point Correction • Deduct ½ Hip x 1.414 =25mm • Add ½ Rafter Thickness = 17.5 • Long Point Correction = -7.5 mm • True Length = 650 – 17.5 – 7.5 Cos 25 • True Length = 625 = 690 mm to Long Pt (red) Cos 25

  38. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Plumb Cut for Crippled Centring Rafter Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Crippled Centring Rafter is in the same plane as the Common Rafters Therefore it must be the same pitch as the Common Rafters, so it must have the SAME PLUMB CUT AT BOTH ENDS

  39. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Edge Bevel for Crippled Centring Rafter Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 What Triangle forms the Bevel ?

  40. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Edge Bevel for Crippled Centring Rafter Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 What Triangle forms the Bevel

  41. Simple Bevel Development From Previous • Plumb Bevel Rafter • Level Bevel Rafter • Edge Bevel Creeper • Edge Bevel Purlin • Plumb Bevel Hip • Level Bevel Hip • Edge Bevel Hip • Face Bevel Purlin

  42. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Edge Bevel for Crippled Centring Rafter Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Edge Bevel for Crippled Centring Rafter is the CREEPER EDGE BEVEL • The same is for • Valley Creepers • Crippled Creepers

  43. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Edge Bevel for Crippled Centring Rafter is the CREEPER EDGE BEVEL • The same is for • Valley Creepers • Crippled Creepers It follows that all the The purlin bevels are The same as the hip end

  44. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Every Valley Creeper must have an opposing creeper Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35

  45. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Every Valley Creeper must have an opposing creeper Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35

  46. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Every Valley Creeper must have an opposing creeper Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35

  47. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Every Valley Creeper must have an opposing creeper Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 From previous calculations we determined the following

  48. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Every Valley Creeper must have an opposing creeper Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Centreline length is the same as distance from the gathering point

  49. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Every Valley Creeper must have an opposing creeper Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 To determine true length Long Pt Centreline length 325 Deduct ½ Ridge 17.5 +/- Long Point Correction -7.5 TL = 300/cos 25 =

  50. Lay out of Broken Hip Roof Roof Pitch = 25⁰ Every Valley Creeper must have an opposing creeper Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 To determine true length Long Pt Centreline length 325 Deduct ½ Ridge 17.5 +/- Long Point Correction -7.5 TL = 300/cos 25 = 331 (RED) NOTE - Long Point Correction will be the same if the Valley & Rafter are the same thickness

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