why allowance for wastage is necessary when preparing an estimate/ built up rate？

Expert Solution

Allowance of waste is an important parameter because of the following reasons

Materials get wasted at the site during construction due to various reasons like spillage , some get stuck in the mixing areas and containers, sometimes the concrete mix doesn't become satisfactory and have to be dumped , sometimes the materials get spoilt etc .Basically, we know that we cannot use 100% of the materials , some get wasted due to different factors.
In calculation for various materials , the calculated amount is the exact amount of materials required for the construction excluding the wastage .
The allowance for wastage is a certain amount of surplus materials added so that there is no shortage of materials while the construction is ongoing.
The cost estimation for materials are done after calculating the total amount of the materials, if the allowance for waste is not added , in case of certain contracts , it will result in loss of the builders.

Ally Wells answered 7 months ago

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