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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. - PowerPoint PPT Presentation
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Estimating Hip Roofs
Estimating Hip Roofs- Rafters
Determine No of Rafters 12 500/ 600 = 20.833 = 21 + 1 = 22 Rafters each side = 44
Pitch = 24⁰
Note – Change of Layout of Ceiling Joists to Accommodate Creepers
Determine Rafter LengthSpan = 6900
Determine Rafter LengthSpan = 6900Half Span = 3450
Determine Rafter LengthSpan = 6900Half Span = 3450Run = 3450
Determine Rafter LengthSpan = 6900Half Span = 3450Run = 3450 – 9.5
= 3440.5Run of Eaves = 600Total Run = 3450 + 600
= 4050Total Length =4050/ cos 24
=4433 + offset =4473
Estimating Sheet
No. LengthRafters 90 x 45 Radiata 44 4.473 4.500 198.000 2.30$ 455.40$
Total Linear Rate / lm Cost Order
Item Section Size Material Linear
Estimating Hip Roof - RidgePitch = 24⁰
Overhang 450
Rafter 90 x 45 F7600 c to c
Ridge 140 x 19Purlin 90 x 70 F7
Ridge Runs Between Crown End12.500 -2 x 3600 = 5300 5300 + ½ Rafter Thickness for each hip end5300 + 45 =5345 mm
Estimating Sheet
No. LengthRafters 90 x 45 Radiata 48 4.473 4.500 216.000 2.30$ 496.80$ Ridge 140 x 19 Radiata 1 5.345 5.400 6.000 6.00$ 36.00$
Total Linear Rate / lm Cost Order
Item Section Size Material Linear
Estimating Hip Roof - PurlinPitch = 24⁰
Overhang 450
Rafter 90 x 45 F7600 c to cTiled Roof
Ridge 140 x 19Purlin 90 x 70 F7Spacing 2200 centres
1 Row Purlins at Centre Span
Deduct ¼ span for every hip
12500 – 1725 – 1725 = 9050 allow 150 for joints = 9200 6900 – 1725 – 1725 = 3450
Estimating Sheet
No. LengthRafters 90 x 45 Radiata 48 4.473 4.500 216.000 2.30$ 496.80$ Ridge 140 x 19 Radiata 1 5.345 5.400 5.400 5.40$ 29.16$ Purlins 100 x 75 Radiata 2 9.200 9.300 18.600 3.80$ 70.68$ Purlins 100 x 75 Radiata 2 3.450 3.600 7.200 3.80$ 27.36$
Total Linear Rate / lm Cost Order
Item Section Size Material Linear
Estimating Hip Roof – Hip RafterPitch = 24⁰
Overhang 450
Rafter 90 x 45 F7600 c to cHip 140 x 19Ridge 140 x 19Purlin 90 x 70 F7
Method 2Hip = √(Total Rafter² + (Half Span + O/H)²Hip = √(4433² + (3450 + 600)² )Hip = √(19.551 + 16.403)Hip = 6.004 + 0.15 for Plumb CutHip = 6.154
Method 1Hip = √(Rise² + ((Half Span + O/H) x 1.414)²Hip = √(1.803² + ((3450 + 600) x 1.414)² )Hip = √(3.251 + 32.795)Hip = 6.003 + 0.15 for Plumb CutHip = 6.153
Estimating Sheet
No. LengthRafters 90 x 45 Radiata 48 4.473 4.500 216.000 2.30$ 496.80$ Ridge 140 x 19 Radiata 1 5.345 5.400 5.400 5.40$ 29.16$ Purlins 100 x 75 Radiata 2 9.200 9.300 18.600 3.80$ 70.68$ Purlins 100 x 75 Radiata 2 3.450 3.600 7.200 3.80$ 27.36$
Hip 140 x 19 Radiata 4 6.153 6.300 25.200 5.40$ 136.08$
Total Linear Rate / lm Cost Order
Item Section Size Material Linear
Estimating Gable Roof - StrutsPitch = 24⁰
Overhang 450
Rafter 90 x 45 F7600 c to c
Tiled Roof with Flush Gable & Raking Eaves
Ridge 140 x 19
Purlin 90 x 70 F7Span 2700
Struts are Difficult to EstimateDevelop a Best Guest Method
Determine No Required9.050/2700 =3.4= 4= 5 Each Side Determine No Required3.450/2700 =1.28= 2= 3 Each Side
Estimating Gable Roof - StrutsPitch = 24⁰
Overhang 450
Rafter 90 x 45 F7600 c to c
Tiled Roof with Flush Gable & Raking Eaves
Ridge 140 x 19
Purlin 90 x 70 F7Span 2700
LengthHalf Rise x √2 x √2(3.450/2 x tan24) x 20.768 x 2 = 1.536
Estimating Sheet
No. LengthRafters 90 x 45 Radiata 48 4.473 4.500 216.000 2.30$ 496.80$ Ridge 140 x 19 Radiata 1 5.345 5.400 5.400 5.40$ 29.16$ Purlins 100 x 75 Radiata 2 9.200 9.300 18.600 3.80$ 70.68$ Purlins 100 x 75 Radiata 2 3.450 3.600 7.200 3.80$ 27.36$
Hip 140 x 19 Radiata 4 6.153 6.300 25.200 5.40$ 136.08$ Struts 100 x 75 Radiata 13 1.536 1.800 23.400 3.80$ 88.92$
Total Linear Rate / lm Cost Order
Item Section Size Material Linear
Estimating Gable Roof – Collar TiesPitch = 24⁰
Overhang 450
Rafter 90 x 45 F7600 c to c
Tiled Roof with Flush Gable & Raking Eaves
Ridge 140 x 19
Purlin 90 x 70 F7Span 2700
Collar Ties 90 x 35
Collar Ties on Every 2nd RafterOn top of PurlinsLength of Ridge / Rafter Spacing / 222/2 = 11+1 @ HALF SPAN12 @ 3450
Estimating Sheet
No. LengthRafters 90 x 45 Radiata 44 4.259 4.500 198.000 2.30$ 455.40$ Ridge 140 x 19 Radiata 1 5.345 5.400 5.400Purlins 90 x 70 Radiata 2 12.800 12.900 25.800 3.80$ 98.04$ Ridge 140 x 19 Radiata 1 14.000 14.100 14.100 3.50$ 49.35$ Struts 90 x 70 Radiata 6 3.064 3.300 19.800 3.80$ 75.24$
Total Linear Rate / lm Cost Order
Item Section Size Material Linear
Estimating Tile QuantitiesPitch = 24⁰
Overhang 450
Rafter 90 x 45 F7600 c to c
Tiled Roof with Flush Gable & Raking Eaves
Ridge 140 x 19
Purlin 90 x 70 F7Span 2700
Collar Ties 90 x 35Calculate Roof Area
Determine Rafter LengthSpan = 6900Half Span = 3450Run = 3450 – 9.5
= 3440.5Run of Eaves = 600Total Run = 3450 + 600
= 4050Total Length =4050/ cos 24
=4433 + offset =4473
Estimating Tile QuantitiesPitch = 24⁰
Overhang 450
Rafter 90 x 45 F7600 c to c
Tiled Roof with Flush Gable & Raking Eaves
Ridge 140 x 19
Purlin 90 x 70 F7Span 2700
Collar Ties 90 x 35True Length of Rafter = 4433
Area of Roof = 4433 x (12.800 +2 x 0.45) x 2 = 121.464 x 7 tiles per sqm = 850.249
