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Estimating Hip Roofs

Estimating Hip Roofs. Estimating Hip Roofs- Rafters. Pitch = 24⁰. Note – Change of Layout of Ceiling Joists to Accommodate Creepers. Determine No of Rafters. 12 500/ 600 = 20.833 = 21 + 1 = 22 Rafters each side = 44. Determine Rafter Length Span = 6900.

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Estimating Hip Roofs

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  1. Estimating Hip Roofs

  2. Estimating Hip Roofs- Rafters Pitch = 24⁰ Note – Change of Layout of Ceiling Joists to Accommodate Creepers Determine No of Rafters 12 500/ 600 = 20.833 = 21 + 1 = 22 Rafters each side = 44

  3. Determine Rafter Length Span = 6900

  4. Determine Rafter Length Span = 6900 Half Span = 3450

  5. Determine Rafter Length Span = 6900 Half Span = 3450 Plan Length = 3450 3450

  6. Determine Rafter Length Span = 6900 Half Span = 3450 Plan Length = 3450 Pitch = 24° 3450

  7. Determine 1m triangle Hip Length per 1m of Rafter Rafter Length/m Rise/m 24° 1.000 Plan Length per 1m of Rafter

  8. Determine 1m triangle • Solve Common Rafter Hip Length per 1m of Rafter 1.000 ÷ Cos 24° 1.000 x Tan 24° 24° 1.000 Plan Length per 1m of Rafter

  9. Determine 1m triangle • Solve Common Rafter 1.094 0.455 1.000

  10. Determine 1m triangle • Solve Hip Hip Length per 1m of Rafter 1.094 0.455 24° 1.000 Plan Length per 1m of Rafter

  11. Determine 1m triangle • Solve Hip √(2 + Rise2) 1.094 0.455 24° 1.000 √2

  12. Determine 1m triangle • Multipliers This is the multiplier for the Hip Rafter This is the multiplier for the Common Rafter 1.486 1.094 0.455 24° 1.000 1.414

  13. Determine 1m triangle • Multipliers This is the multiplier for the Hip Rafter 1.486 1.094 0.455 24° 1.000 1.414

  14. Rafter Multiplier = 1.094 Hip Multiplier = 1.486 Determine Rafter Length Span = 6900 Plan Length = 3450

  15. Rafter Multiplier = 1.094 Hip Multiplier = 1.486 Determine Rafter Length Span = 6900 Plan Length = 3450 Plan length Eaves = 600

  16. Rafter Multiplier = 1.094 Hip Multiplier = 1.486 Determine Rafter Length Span = 6900 Plan Length = 3450 Plan length Eaves = 600 Total Plan Length = 4050

  17. Rafter Multiplier = 1.094 Hip Multiplier = 1.486 Determine Rafter Length Span = 6900 Plan Length = 3450 Plan length Eaves = 600 Total Plan Length = 4050 Rafter Length = 4050 x 1.094

  18. Rafter Multiplier = 1.094 Hip Multiplier = 1.486 Rafter 90 x 45 Determine Rafter Length Span = 6900 Plan Length = 3450 Plan length Eaves = 600 Total Plan Length = 4050 Rafter Length = 4050 x 1.094 = 4433 + Plumb Cut 100 if < 100 else Rafter Depth

  19. Rafter Multiplier = 1.094 Hip Multiplier = 1.486 Rafter 90 x 45 Determine Rafter Length Span = 6900 Plan Length = 3450 Plan length Eaves = 600 Total Plan Length = 4050 Rafter Length = 4050 x 1.094 = 4433 + 100 100 if < 100 else Rafter Depth

  20. Rafter Multiplier = 1.094 Hip Multiplier = 1.486 Rafter 90 x 45 Determine Rafter Length Span = 6900 Plan Length = 3450 Plan length Eaves = 600 Total Plan Length = 4050 Rafter Length = 4050 x 1.094 = 4533

  21. Estimating Sheet

  22. Estimating Hip Roof - Ridge Pitch = 24⁰ Overhang 450 Rafter 90 x 45 F7 600 c to c Ridge 140 x 19 Purlin 90 x 70 F7 Ridge Runs Between Crown End 12.500 -2 x 3450 = 5600 5300 + ½ Rafter Thickness for each hip end 5300 + 45 =5645 mm

  23. Estimating Sheet

  24. Estimating Hip Roof – Hip Rafter

  25. Rafter Multiplier = 1.094 Hip Multiplier = 1.486 Rafter 90 x 45 Hip 140 x 19 Determine Rafter Length Span = 6900 Plan Length = 3450 Plan length Eaves = 600 Total Plan Length = 4050 Hip Length = 4050 x 1.486

  26. Rafter Multiplier = 1.094 Hip Multiplier = 1.486 Rafter 90 x 45 Hip 140 x 19 Determine Rafter Length Span = 6900 Plan Length = 3450 Plan length Eaves = 600 Total Plan Length = 4050 Hip Length = 4050 x 1.486 = 6.018 + Hip Depth

  27. Rafter Multiplier = 1.094 Hip Multiplier = 1.486 Rafter 90 x 45 Hip 140 x 19 Determine Rafter Length Span = 6900 Plan Length = 3450 Plan length Eaves = 600 Total Plan Length = 4050 Hip Length = 4050 x 1.486 = 6018 + 140

  28. Rafter Multiplier = 1.094 Hip Multiplier = 1.486 Rafter 90 x 45 Hip 140 x 19 Determine Rafter Length Span = 6900 Plan Length = 3450 Plan length Eaves = 600 Total Plan Length = 4050 Hip Length = 4050 x 1.486 = 6158

  29. Estimating Sheet

  30. Estimating Hip Roof - Purlin Pitch = 24⁰ Overhang 450 Rafter 90 x 45 F7 600 c to c Tiled Roof Ridge 140 x 19 Purlin 90 x 70 F7 Spacing 2200 centres 1 Row Purlins at Centre Span Deduct ¼ span for every hip 12500 – 2 x 1725 = 9050 allow 150 for joints = 9200 6900 – 2 x 1725 = 3450

  31. Estimating Sheet

  32. Estimating Hip Roof - Struts Pitch = 24⁰ Overhang 600 Rafter 90 x 45 F7 600 c to c Tiled Roof with Flush Gable & Raking Eaves Ridge 140 x 19 Purlin 90 x 70 F7 Span 2700 Struts are Difficult to Estimate Develop a Best Guest Method Determine No Required 9.050/2700 =3.4= 4= 5 Each Side Determine No Required 3.450/2700 =1.28= 2= 3 Each Side

  33. Estimating Gable Roof - Struts Pitch = 24⁰ Overhang 600 Rafter 90 x 45 F7 600 c to c Tiled Roof with Flush Gable & Raking Eaves Ridge 140 x 19 Purlin 90 x 70 F7 Span 2700 Length = Use Rise Rise = ½ Span x Rise/m = 3450 x 0.455 = 1.569

  34. Estimating Sheet

  35. Estimating Gable Roof – Collar Ties Pitch = 24⁰ Overhang 600 Rafter 90 x 45 F7 600 c to c Tiled Roof with Flush Gable & Raking Eaves Ridge 140 x 19 Purlin 90 x 70 F7 Span 2700 Collar Ties 90 x 35 Collar Ties on Every 2nd Rafter On top of Purlins Length of Ridge / Rafter Spacing / 2 22/2 = 11+1 @ HALF SPAN 12 @ 3450

  36. Estimating Sheet

  37. Estimating Tile Quantities Pitch = 24⁰ Overhang 450 Rafter 90 x 45 F7 600 c to c Tiled Roof with Flush Gable & Raking Eaves Ridge 140 x 19 Purlin 90 x 70 F7 Span 2700 Collar Ties 90 x 35 Tiles 7 per m2 True Length of Rafter = 4433 Total Length of Building = 12800 + 2 x 450 = 13.700 Area of Roof = 4433 x 13.7 x 2 = 121.464m2 x 7 tiles per m2 = 850.249 say 851

  38. Estimating Sheet

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