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1. PLASTER WORK ESTIMATION A man is plastering a  brick wall  The amount of cement mortar required for 1m 2 coverage on wall for a plaster work. Let the thickness of the plaster for one coat external rendering be 15mm. The volume of a plaster per square meter is given as shown below Volume = 1m x 1m 0.015m             = 0.015m 3 The dry volume of cement mortar for plaster can be calculated as follows Dry volume = Wet volume x Wet to dry conversion factor (1.25 - 1.3)                     = 0.015 x 1.30                    = 0.0195m 3 The mortar constituents can be calculated based on the cement sand mix ratio for example in our calculation we will use mix ratio 1:4 (cement: sand). The cement volume can be calculated as shown below Firstly 1+4 = 5 (division number) Then, for cement we have 1/5 x 0.0195 = 0.0039m 3 For sand also can be calculated as follows Sand volume 4/5 x 0.0195 = 0.015