For 15 mm thick cement plastering 1 : 6 on 100 sq. m. new brick work, the quantity of cement required is

The volume of the plaster $= 100 m² × 0.015 m = 1.5 m^3$

We have to increase the mortar value by (To accommodate new wall depression & wastages volume of plaster)

Increase mortar for uniform wall by $30-35%$

For volume of dry mortar increase $25%$

So, it is possible to go around $60%$ extra volume for dry & wet mortar.

Therefore, volume of dry mortar = $(1.5 \times \frac{{160}}{{100}} = 2.4)$

Now $1$ part is of cement has $6$ part is of sand so,

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