Clear cover to main reinforcement in
Footings : 50 mm
Raft foundation Bottom/ sides : 75 mm
Strap Beam : 50 mm
Grade Slab : 20 mm
Column : 40 mm (d>12mm) 25 mm (d= 12mm)
Shear Wall : 25 mm
Beams : 25 mm
Slabs : 15 mm or not less than diameter of the bar.
Flat Slab : 20 mm
Staircase : 15 mm
Retaining Wall on Earth : 20/ 25 mm
Water retaining structures : 20 / 30 mm
Sunshade (Chajja) : 25 mm
Hook f or stirrups is 9D for one side
No. of stirrups = (clear span/Spanning) + 1
For Cantilever anchorage length f or main steel is 69D
“L” f or column main rod in f ooting is minimum of 300mm
Chairs of minimum 12 mm diameter bars should be used.
Minimum diameter of dowel bars should be 12 mm
Lap slices should not be used f or bar larger than 36 mm.
In steel reinf orcement binding wire required is 8 kg per MT.
Lapping is not allowed f or the bars having diameters more than 36 mm.
Minimum number of bars f or a square column are 4 and f or circular
column are 6.
Longitudinal reinforcement should not be less than 0.8% and more than 6%
of gross C/S.
Weight of rod per meter length = d2/162 where d is the diameter in mm
Main bars in the slabs shall not be less than 8 mm (HYSD) or 10 mm
(Plain bars) and the distributors not less than 8 mm and not more than 1/8 of slab thickness.
In case of spacing of bars
Provide the diameter of the bar, if the diameter of the bar are equal.
Provide the diameter of the larger bar, if the diameter are unequal.
5mm more than the nominal maximum size of the coarse aggregate.
