Civil Guaidline
Clear cover to main reinforcement in
Footings
: 50 mm
Raft
foundation Top : 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
for stirrups is 9D for one side
No.
of stirrups = (clear span/Spanning) + 1
For
Cantilever anchorage length for main steel is 69D
“L”
for column main rod in footing 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 for bar larger than 36 mm.
In
steel reinforcement binding wire required is 8 kg per MT.
Lapping
is not allowed for the bars having diameters more than 36 mm.
Minimum
number of bars for a square column are 4 and for 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
All
reinforcement shall be free from mill scales, loose rust & coats of paints,
oil or any other substances.
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.
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