In R.C.C. works, if details are not given the volume of steel may be taken as 0.6% to 1.0% of R.C.C. volume. No deduction for steel is made in the volume of concrete. Deductions in the case of plastering and painting area allowed as follows:
Openings of less than 0.5 m area
- no deduction.
Opening of area between 0.5 to 3m
deduction is made for one face only and the other face is allowed for is allowed for jambs, soffits, sills etc.
Openings of area more than 3 m
- deductions is made for both faces and the jamps, soffits and sills are accounted for.
Weight of iron hold fast is usually taken as one kg. When not specified, 4 hold fasts for window and 6 hold fasts for doors are taken. Hence, in estimation of quantity of plastering work, quantity of deduction for openings allowed for 2 m lies between (0.5 to 3 m ) is deduction is allowed for one face only of the wall.