Allowable Wastage Of Construction Materials | LCETED | CONSTRUCTION MANAGEMENT

Material cost is a major issue of construction, which significantly affects project cost. Some material wastes such as brick are recyclable for brickbat cob, and some cannot be reused in construction.

However, we cannot completely prevent wastage while working, but we can control it. Each quantity surveyor will add some permissible waste when evaluating materials to determine construction cost.

But that does not mean we can waste those allowable limits. These wastes are added not only for work efficiency but also for environmental factors.

Construction works are measured according to IS code 1200, but the allowable waste percentage is nowhere explained. There are no IS codes to evaluate waste.

ALSO READ: ESTIMATION OF BUILDING WASTE FROM THE CONSTRUCTION

Permissible wastes for major construction materials are listed below for evaluation according to practical experience.

MATERIAL	ALLOWABLE WASTAGE	POSSIBILITIES OF WASTAGE
Cement	3% to 4%	Due to the cement fineness, it can fly in the air when the cement mixes with other materials.
Sand	6% to 15%	Sand is sieved for plastering. In that process, some coarse sand will be ignored during sieving and some particles will fall off during transportation.
Coarse Aggregates	6% to 8%	The coarse aggregates pieces may fall off during transportation.
Tile	1 to 2%	Tile wastes rarely occur. Tiles can break during transport and may break during work.
Granite	8% to 12%	Granite wastes rarely occur. Granite can break during transport and may break during work.
Reinforcement Steel	4.5% to 6%	Cutting and bending process of steel for reinforcement causes steel wastages,   NOTE: Steel wastages can be used by many ways. When the steel length is below 1000mm, then it is considered as wastage.
Structural Steel	12% to 15%	Structural wastes occur on fabrication work like cutting and bending steel plate or sections.
Bricks	3% to 4%	During the transportation of bricks causes brick breakages. It is deliberately divided into two pieces for ease of work.
Filling Soil	4% to 5%	During transportation and filling causes soil particles mayfly.
Paint	3% to 4%	The paint  may fall off when applied to the wall, but proper work behaviour can control it.
Wood	5%	The piece of wood is carved for a smooth surface finishes and is properly fixed on doors or windows.
Concrete	1% to 5%	When pouring concrete in the shuttering area causes concrete wastage, but good workmanship can control it.
Mortar	1% to 2%	While applying mortar on the wall cause wastage in mortar.
Shuttering Board	6% to 7%	The shuttering boards are carved or cut for concrete works. It can be controllable

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