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Broken Hip Roof

Broken Hip Roof

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Broken Hip Roof

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  1. Broken Hip Roof

  2. Lay out of Hip & Valley Roof Roof Pitch = 25⁰

  3. Lay out of Hip & Valley Roof Roof Pitch = 25⁰ What Members define Creeper side cut

  4. Lay out of Hip & Valley Roof Roof Pitch = 25⁰ What Members define Valley Creeper side cut • What Members define Creeper side cut • Half Span • Common Rafter

  5. Lay out of Hip & Valley Roof Roof Pitch = 25⁰ • What Members define Valley Creeper side cut • Half Span • Common Rafter • What Members define Creeper side cut • Half Span • Common Rafter

  6. Lay out of Hip & V Roof Roof Pitch = 25⁰ • What Members define Creeper side cut • Half Span • Common Rafter

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

  8. 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

  9. 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

  10. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm 1.489 1.103 0.466 1.000 Determine Required LengthsCommon Rafter Major Span = √2

  11. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm 1.489 1.103 0.466 1.000 Determine Required LengthsCommon Rafter Major Span = Plan Length x Rafter Length / m = (1000 – 17.5) x 1.103 = 982.5 x 1.103 = 1084 √2

  12. Common Rafter – Major SpanPlumb Cut 1.489 1.103 0.466 1.000 √2 Plumb Cut

  13. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm 1.489 1.103 0.466 1.000 Determine Required LengthsCommon Rafter Major Span = 1084 Common Rafter Minor Span = √2

  14. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm 1.489 1.103 0.466 1.000 Determine Required LengthsCommon Rafter Major Span = 1084 Common Rafter Minor Span = Plan Length x Rafter Length / m = (675 – 17.5) x 1.103 = 657.5 x 1.103 = 725 √2

  15. Common Rafter – Minor SpanPlumb Cut • As Major & Minor Span are the same pitch the plumb cuts must be the same 1.489 1.103 0.466 1.000 √2 Plumb Cut

  16. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm 1.489 1.103 0.466 1.000 Determine Required LengthsCommon Rafter Major Span = 1084 Common Rafter Minor Span = 725 Rise Main Roof = (½ Span – ½ Ridge) x Rise / m = (1000 – 17.5) x 0.466 = 982.5 x 0.466 = 458 √2

  17. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm 1.489 1.103 0.466 1.000 Determine Required LengthsCommon Rafter Major Span = 1084 Common Rafter Minor Span = 725 Rise Main Roof = 458 = (½ Span Major – ½ Ridge) x Rise / m = (1000 – 17.5) x 0.466 = 982.5 x 0.466 = 458 √2

  18. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm 1.489 1.103 0.466 1.000 Determine Required LengthsCommon Rafter Major Span = 1084 Common Rafter Minor Span = 725 Rise Main Roof = 458 Rise Minor Roof = = (½ Span Minor – ½ Ridge) x Rise / m = (675 – 17.5) x 0.466 = 657.5 x 0.466 = 306 √2

  19. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm 1.489 1.103 0.466 1.000 Determine Required LengthsCommon Rafter Major Span = 1084 Common Rafter Minor Span = 725 Rise Main Roof = 458 Rise Minor Roof = 306 √2

  20. 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 We recall that all hips & valleys bisect corners. In this building it means that they are at 45⁰.

  21. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm 1.489 1.103 0.466 1.000 Determine Required LengthsCommon Rafter Major Span = 1084 Common Rafter Minor Span = 725 Rise Main Roof = 458 Rise Minor Roof = 306 Hip Length Major Span = Plan Length Crown End Rafter x Hip length/m = (1000 – 17.5) x 1.489 = 982.5 x 1.489 = 1.463 √2

  22. Hip Rafter – Major SpanPlumb Cut 1.489 1.103 0.466 1.000 √2 Plumb Cut

  23. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm 1.489 1.103 0.466 1.000 Determine Required LengthsCommon Rafter Major Span = 1084 Common Rafter Minor Span = 725 Rise Main Roof = 458 Rise Minor Roof = 306 Hip Length Major Span = 1.463 Hip Length Minor Span = = Plan Length Crown End Rafter x Hip length/m = (0.675 – 17.5) x 1.489 = 657.5 x 1.489 = 979 √2

  24. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm 1.489 1.103 0.466 1.000 Determine Required LengthsCommon Rafter Major Span = 1084 Common Rafter Minor Span = 725 Rise Main Roof = 458 Rise Minor Roof = 306 Hip Length Major Span = 1.463 Hip Length Minor Span = = Plan Length Crown End Rafter x Hip length/m = (0.675 – 17.5) x 1.489 = 657.5 x 1.489 = 979 √2 Valley is the same as the hip

  25. Hip Rafter – Minor SpanPlumb Cut • As Major & Minor Span are the same pitch the plumb cuts must be the same 1.489 1.103 0.466 1.000 √2 Plumb Cut

  26. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm Determine Centreline LengthCommon Rafter Major Span = 1084 Common Rafter Minor Span = 725 Rise Main Roof = 458 Rise Minor Roof = 306 Hip Length Major Span = 1.463 Hip Length Minor Span = 979 1st Creeper Major Plan Length = ½ Span – Spacing + Correction = 1000 – 300 + (1.414 x -17.5 + 17.5) = 693 x Rafter Length / m = 693 x 1.103 = 764 1.489 1.103 0.466 1.000 √2 Note these measurements are directional as it goes back towards the Top Plate it must be a negative

  27. Creepers– Major SpanPlumb Cut • Creepers are the same pitch as the Common Rafters. They must have the same Plumb Cut 1.489 1.103 0.466 1.000 √2 Plumb Cut

  28. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm Determine Centreline LengthCommon Rafter Major Span = 1084 Common Rafter Minor Span = 725 Rise Main Roof = 458 Rise Minor Roof = 306 Hip Length Major Span = 1.463 Hip Length Minor Span = 979 1st Creeper Major = 764 1st Creeper Minor = 406 Plan Length = ½ Span – Spacing + Correction = 675 – 300 + (1.414 x -17.5 + 17.5) = 368 x Rafter Length / m = 368 x 1.103 = 406 1.489 1.103 0.466 1.000 √2

  29. Creepers– Minor SpanPlumb Cut • Creepers are the same pitch as the Common Rafters. They must have the same Plumb Cut 1.489 1.103 0.466 1.000 √2 Plumb Cut

  30. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm Determine Required LengthsCommon Rafter Major Span = 1084 Common Rafter Minor Span = 725 Rise Main Roof = 458 Rise Minor Roof = 306 Hip Length Major Span = 1.463 Hip Length Minor Span = 979 1st Creeper Major = 764 1st Creeper Minor = 406 1st Valley Creeper = 698 Plan Length = ½ Span + Valley Correction – ½ Ridge = 675 - (1.414 x -17.5 + 17.5) – 17.5 = 633 x Rafter Length / m = 633 x 1.103 = 698 1.489 1.103 0.466 1.000 √2

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

  32. Crippled or Valley CreepersPlumb Cut • Creepers are the same pitch as the Common Rafters. They must have the same Plumb Cut 1.489 1.103 0.466 1.000 √2 Plumb Cut

  33. 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

  34. 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.

  35. 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 Hips at 45° 1000-675 = 325 ½ Span Major – ½ Span Minor

  36. 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

  37. 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 Both Hips at 45° 1000-675 = 325 ½ Span Major – ½ Span Minor

  38. 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 = (½ Major Span – ½ Minor Span) x 2 Or = Major Span – Minor Span This must be 2x This

  39. 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

  40. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm Determine Required LengthsCommon Rafter Major Span = 1084 Common Rafter Minor Span = 725 Rise Main Roof = 458 Rise Minor Roof = 306 Hip Length Major Span = 1.463 Hip Length Minor Span = 979 1st Creeper Major = 764 1st Creeper Minor = 406 1st Valley Creeper = 698 Crippled Centring Rafter = 689 Plan Length = Major Span – Minor Span + Valley Correction – ½ Ridge = 2000 – 1350 + (1.414 x -17.5 + 17.5) – 17.5 = 625 x Rafter Length / m = 625 x 1.103 = 689 1.489 1.103 0.466 1.000 √2

  41. Crippled Centring RafterPlumb Cut • Crippled Centring Rafter is the same pitch as the Common Rafters. • It must have the same Plumb Cut 1.489 1.103 0.466 1.000 √2 Plumb Cut

  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 What Triangle forms the Bevel

  43. 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

  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 +/- Long Point Correction -7.5 (-17.5 x 1.414 + 17.5) Deduct ½ Ridge 17.5 Plan Length = 325 +-7.5 - 17.5

  50. Roof Pitch = 25⁰ Lay out of Broken Hip Roof Rafter 90 x 35 @ 450 c to c Hip Rafters 140 x 35 Ridge 140 x 35 Rafter Spacing 300mm Determine Required LengthsCommon Rafter Major Span = 1084 Common Rafter Minor Span = 725 Rise Main Roof = 458 Rise Minor Roof = 306 Hip Length Major Span = 1.463 Hip Length Minor Span = 979 1st Creeper Major = 764 1st Creeper Minor = 406 1st Valley Creeper = 698 Crippled Centring Rafter = 689 Crippled Creeper Matching = 331 Plan Length = ½ Span Major – ½ Span Minor + Valley Correction – ½ Ridge = 1000 – 675 + (1.414 x -17.5 + 17.5) – 17.5 = 300 x Rafter Length / m = 300 x 1.103 = 331 1.489 1.103 0.466 1.000 √2