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 = 3450Plan Length = 3450

3450

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

3450

Determine 1m triangle

24°

1.000

Rise/mRafter Length/m

Plan Length per 1m of Rafter

Hip Length per 1m of Rafter

Determine 1m triangle

• Solve Common Rafter

24°

1.000

1.000 x Tan 24°1.000 ÷ Cos 24°

Plan Length per 1m of Rafter

Hip Length per 1m of Rafter

Determine 1m triangle

• Solve Common Rafter

1.000

0.455

1.094

Determine 1m triangle

• Solve Hip

24°

1.000

0.455

1.094

Plan Length per 1m of Rafter

Hip Length per 1m of Rafter

Determine 1m triangle

• Solve Hip

24°

1.000

0.455

1.094

√2

√(2 + Rise 2)

Determine 1m triangle

• Multipliers

24°

1.000

0.455

1.094

1.414

1.486

This is the multiplier for the Common Rafter

This is the multiplier for the Hip Rafter

Determine 1m triangle

• Multipliers

24°

1.000

0.455

1.094

1.414

1.486

This is the multiplier for the Hip Rafter

Determine Rafter LengthSpan = 6900Plan Length = 3450

Rafter Multiplier = 1.094Hip Multiplier = 1.486

Determine Rafter LengthSpan = 6900Plan Length = 3450Plan length Eaves = 600

Rafter Multiplier = 1.094Hip Multiplier = 1.486

Determine Rafter LengthSpan = 6900Plan Length = 3450Plan length Eaves = 600

Total Plan Length = 4050

Rafter Multiplier = 1.094Hip Multiplier = 1.486

Determine Rafter LengthSpan = 6900Plan Length = 3450Plan length Eaves = 600

Total Plan Length = 4050

Rafter Length = 4050 x 1.094

Rafter Multiplier = 1.094Hip Multiplier = 1.486

Determine Rafter LengthSpan = 6900Plan Length = 3450Plan length Eaves = 600

Total Plan Length = 4050

Rafter Length = 4050 x 1.094 = 4433 + Plumb Cut

Rafter Multiplier = 1.094Hip Multiplier = 1.486

Rafter 90 x 45

100 if < 100 else Rafter Depth

Determine Rafter LengthSpan = 6900Plan Length = 3450Plan length Eaves = 600

Total Plan Length = 4050

Rafter Length = 4050 x 1.094 = 4433 + 100

Rafter Multiplier = 1.094Hip Multiplier = 1.486

Rafter 90 x 45

100 if < 100 else Rafter Depth

Determine Rafter LengthSpan = 6900Plan Length = 3450Plan length Eaves = 600

Total Plan Length = 4050

Rafter Length = 4050 x 1.094 = 4533

Rafter Multiplier = 1.094Hip Multiplier = 1.486

Rafter 90 x 45

Estimating Sheet

No. LengthRafters 90 x 45 Radiata 44 4.533 4.800 211.200 2.30$ 485.76$

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 3450 = 5600 5300 + ½ Rafter Thickness for each hip end5300 + 45 =5645 mm

Estimating Sheet

No. LengthRafters 90 x 45 Radiata 48 4.533 4.800 230.400 2.30$ 529.92$ Ridge 140 x 19 Radiata 1 5.645 5.700 6.000 6.00$ 36.00$

Total Linear Rate / lm Cost Order

Item Section Size Material Linear

Estimating Hip Roof – Hip Rafter

Determine Rafter LengthSpan = 6900Plan Length = 3450Plan length Eaves = 600

Total Plan Length = 4050

Hip Length = 4050 x 1.486

Rafter Multiplier = 1.094Hip Multiplier = 1.486

Rafter 90 x 45Hip 140 x 19

Determine Rafter LengthSpan = 6900Plan Length = 3450Plan length Eaves = 600

Total Plan Length = 4050

Hip Length = 4050 x 1.486 = 6.018 + Hip Depth

Rafter Multiplier = 1.094Hip Multiplier = 1.486

Rafter 90 x 45Hip 140 x 19

Determine Rafter LengthSpan = 6900Plan Length = 3450Plan length Eaves = 600

Total Plan Length = 4050

Hip Length = 4050 x 1.486 = 6018 + 140

Rafter Multiplier = 1.094Hip Multiplier = 1.486

Rafter 90 x 45Hip 140 x 19

Determine Rafter LengthSpan = 6900Plan Length = 3450Plan length Eaves = 600

Total Plan Length = 4050

Hip Length = 4050 x 1.486 = 6158

Rafter Multiplier = 1.094Hip Multiplier = 1.486

Rafter 90 x 45Hip 140 x 19

Estimating Sheet

No. LengthRafters 90 x 45 Radiata 48 4.533 4.800 230.400 2.30$ 529.92$ Ridge 140 x 19 Radiata 1 5.645 5.700 5.700 5.70$ 32.49$

Hip 140 x 19 Radiata 4 6.158 6.300 25.200 5.70$ 143.64$

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 – 2 x 1725 = 9050 allow 150 for joints = 9200 6900 – 2 x 1725 = 3450

Estimating Sheet

No. LengthRafters 90 x 45 Radiata 48 4.533 4.800 230.400 2.30$ 529.92$ Ridge 140 x 19 Radiata 1 5.645 5.700 5.700 5.70$ 32.49$

Hip 140 x 19 Radiata 4 6.158 6.300 25.200 5.70$ 143.64$ Purlin 90 x 75 Radiata 2 9.200 9.300 18.600 3.80$ 70.68$ Purlin 90 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 - StrutsPitch = 24⁰

Overhang 600

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 600

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 Length = Use Rise

Rise = ½ Span x Rise/m= 3450 x 0.455= 1.569

Estimating Sheet

No. LengthRafters 90 x 45 Radiata 48 4.533 4.800 230.400 2.30$ 529.92$ Ridge 140 x 19 Radiata 1 5.645 5.700 5.700 5.70$ 32.49$

Hip 140 x 19 Radiata 4 6.158 6.300 25.200 5.70$ 143.64$ Purlin 90 x 75 Radiata 2 9.200 9.300 18.600 3.80$ 70.68$ Purlin 90 x 75 Radiata 2 3.450 3.600 7.200 3.80$ 27.36$ Struts 90 x 75 Radiata 13 1.569 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 600

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 48 4.533 4.800 230.400 2.30$ 529.92$ Ridge 140 x 19 Radiata 1 5.645 5.700 5.700 5.70$ 32.49$

Hip 140 x 19 Radiata 4 6.158 6.300 25.200 5.70$ 143.64$ Purlin 90 x 75 Radiata 2 9.200 9.300 18.600 3.80$ 70.68$ Purlin 90 x 75 Radiata 2 3.450 3.600 7.200 3.80$ 27.36$ Struts 90 x 75 Radiata 13 1.569 1.800 23.400 3.80$ 88.92$

Collar Ties 90 x 45 Radiata 12 3.450 3.600 43.200 2.30$ 99.36$

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 35

Tiles 7 per m2

True Length of Rafter = 4433Total 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

Estimating Sheet

No. LengthRafters 90 x 45 Radiata 48 4.533 4.800 230.400 2.30$ 529.92$ Ridge 140 x 19 Radiata 1 5.645 5.700 5.700 5.70$ 32.49$

Hip 140 x 19 Radiata 4 6.158 6.300 25.200 5.70$ 143.64$ Purlin 90 x 75 Radiata 2 9.200 9.300 18.600 3.80$ 70.68$ Purlin 90 x 75 Radiata 2 3.450 3.600 7.200 3.80$ 27.36$ Struts 90 x 75 Radiata 13 1.569 1.800 23.400 3.80$ 88.92$

Collar Ties 90 x 45 Radiata 12 3.450 3.600 43.200 2.30$ 99.36$ Roof Tiles 851.000 3.00$ 2,553.00$

Total 3,545.37$

Total Linear Rate / lm Cost Order

Item Section Size Material Linear