- Thumb rule for Steel quantity required for Slab, Beams, Footings & Columns:
Steel required in residential buildings = 4.5 Kgs – 4.75 Kgs / Sq. Ft.
Steel required For Commercial buildings = 5.0 Kgs-5.50 Kgs/Sq. Ft.
2. Percentage of Steel in Structural Members:
1) Slab – 1% of the total volume of concrete
2) Beam – 2% of the total volume of concrete
3) Column – 2.5% of total volume of concrete
4) Footings – 0.8% of the total volume of concrete
How to calculate the steel quantity of slab having the Length, width, and depth of the slab is 9 m x 4 m x 0.125 m
Calculate the Volume of Concrete
The Total Volume of Concrete for given Slab = 5 x 4 x 0.15
= 4.5 m3
Calculate the steel quantity using formula
Thumb rule to estimate Steel quantity of above slab
= Volume of Concrete x Density of Steel x % of Steel of Member
Steel weight required for above slab = 4.5 x 7850 x 0.01 = 353.25 Kg
Thumb Rules to estimate the Shuttering area:
Shuttering costs is taken as 15-18% of the total construction of the building. Shuttering work is done to bring the concrete in Shape. Thumb rule to estimate the shuttering required is 6 times the quantity of concrete or 2.4 times of Plinth area.
For example, the concrete quantity is 0.5m3, then
Area of Shuttering is 0.5 x 6 = 3m2
Components of Shuttering:-
The Shuttering plate Ply, Battens, Nails are components of Shuttering.
Shuttering Ply Quantity estimation:
Suppose, The shuttering Ply has a length, width & depth of 2.44 x 1.22 x 0.012
The No. of Shuttering Ply sheets = 0.22 times of Shuttering
Suppose, the shuttering area = 3m
Then Ply required for shuttering = 0.22 x 3 = 0.66m2
Battens Quantity Calculation:
Shuttering batten usually has a length & width of 75mm x 40mm.
Batten Quantity = 19.82 x No. of Ply Sheets
If work requires 25 Ply sheets, the total quantity of Battens are 19.82 x 25 = 495 Battens
Nails & Binding Wire Quantity in Shuttering:
Approximately, 75 gms of Nails used in the shuttering of the 1m2 area.
75gms of Binding wire is used for every 1m2 of Shuttering.
Thumb rule for Shuttering oil estimation :
Shuttering oil is applied on the shuttering plate surface used to de-frame or de-assemble from the concrete easily.
Total required Shuttering oil = 0.065 x Total Area of Shuttering
For every 15m2 of shuttering 1 liter of shuttering oil is consumed.
If, total area of shuttering is 15 m2, then Shuttering oil Consumption = 0.065 x 15 = 0.975.