Is there any no deductions made?
No deduction is made for the following-
1. Opening each upto 1000sq.cm or 0.1 sq.m [1sq.ft].
2. Ends of beams, posts, rafters, purlins, etc upto 500sq.cm or 0.05 sq.m( 72 sq in) in section.
3. Bed plate, wall plate , bearing of chajjas and the like upto 10cm (4") depth.
Bearings of floor and roof slabs are not to be deducted from wall masonry.
How to Calculate Volume of deduction for rectangular opening?
Volume of deduction for rectangular opening calculator uses Volume for deduction = Length of rectangular opening*Height of rectangular opening*Thickness wall to calculate the Volume for deduction, The Volume of deduction for rectangular opening formula is the volume of masonry/brickwork for rectangular opening that you need to deduct from your actual volume of masonry , because if you will be providing doors, windows, lintels ( of rectangular shape) then you won't be utilising that area in brickwork and hence that volume you will need to deduct to make sure that you don't order material more than you need in construction. Volume for deduction is denoted by V_{deduction} symbol.
How to calculate Volume of deduction for rectangular opening using this online calculator? To use this online calculator for Volume of deduction for rectangular opening, enter Length of rectangular opening (L_{opening}), Height of rectangular opening (h_{opening}) & Thickness wall (t_{wall}) and hit the calculate button. Here is how the Volume of deduction for rectangular opening calculation can be explained with given input values -> 1.242 = 2*2.7*0.23.