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You are required to build up the net cost unit rates for work items in a bill o...
✅ Перевірена відповідь на це питання доступна нижче. Наші рішення, перевірені спільнотою, допомагають краще зрозуміти матеріал.
You are required to build up the net cost unit rates for work items in a bill of quantities from first principles.
(a) Explain how to build up net cost unit rate from first principles. (2%)
(b) Estimate the net cost unit rates for following work items and calculate the total net cost of these items. (NB: Show all calculations, 20%)
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Unit
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Qty
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Rate
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Total
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Items
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a
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Common brickwork in 1:1:6 composition mortar in 76mm thick on edge wall
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m2
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150
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b
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Face brickwork in 1:1:6 cement mortar coloured by the addition of yellow oxide in 110 thick skins of cavity walls having joints ironed on one face.
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m2
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275
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Total
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Additional information:
Materials (supply only delivered to site):
Common bricks (230 x 110 x 76) $ 1,200.00/1000
Face bricks (230 x 110 x 76) $ 1,400.00/1000
Cement $ 12.50/bag; Sand $ 120.00/t;
Dry material for mortar required for 110mm thick brick walls: allow 3 bags of cement, 3.2 bags of lime and 0.70t of sand
Dry material for mortar required for 76mm think edge walls: allow 2.4 bags cement, 2.6 bags lime, and 0.55t of sand
Yellow oxide $ 40.00/kg; allow 4kg per 1000 standard bricks laid
Allow 10% wastage on face brick and mortar, 5% wastage on common brick
Subcontract labour rates:
Common brickwork $ 2,100.00/1000
Face brickwork $ 2,300.00/1000
Make no allowance for attendance and supervision of subcontractor (included in preliminaries)
Plant:
Cement mixer hire $ 85.00/day
Make no allowance for scaffolding, included in preliminaries
All further information is to be assumed