Material quantities
estimates are based on the abstract of quantities of work calculated by the
quantity surveryors from the contract drawings. The work quantities when
multiplied by the respective estimated materials required for a unit item of
work, give the quantity of materials required for the activity. To quote
example, Bureau of Indian Standard Code I.S. 10067: 1982 gives the materials constants
in building works. In particular, materials estimates must include standard
wastage in materials estimates which occur during execution of work. Table
shows typical wastage percentage which may be included in the materials
estimates.
Construction
Materials Wastage Planning Norms
SI NO.
|
Type of Materials
|
Planned Wastage
|
1.
|
Cement
|
2%
|
2.
|
Sand
|
10%
|
3.
|
Aggregate
|
5%
|
4.
|
Concrete
structural
|
2%
|
5.
|
Concrete
blinding (lean)
|
10%
|
6.
|
Reinforcement
steel bars
|
3%
|
7.
|
Reinforcement
steel mesh
|
10%
|
8.
|
PVC
sheeting
|
15%
|
9.
|
Steel
for windows
|
7%
|
10.
|
Timbering
in trenches
|
5%
|
11.
|
Stone
masonary
|
5%
|
12.
|
Marble
lining
|
20%
|
13.
|
Wood
for door frames
|
5
to 7.5%
|
14.
|
Wood
for shutters
|
10%
|
15.
|
Wood
for floorings/walling
|
5
to 10%
|
16.
|
Sheet
roofing
|
2.1
to 2%
|
17.
|
Tile
roofing
|
5%
|
18.
|
Floor
tiling
|
2
to 5%
|
19.
|
Wall
tiling
|
3%
|
20.
|
Pigments
(for colours other than natural grey)
|
5%
|
21.
|
Paints
|
5%
|
