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Home| Questions|Q 38137
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Mudassir Zishan
Mudassir ZishanBeginner
Asked: September 4, 20212021-09-04T11:36:14+05:30 2021-09-04T11:36:14+05:30In: Construction

How to calculate plaster for wall?

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      Oliva Jones
      2021-09-04T12:00:34+05:30Added an answer on September 4, 2021 at 12:00 pm

      The following are the steps involved in calculating plastering quantities:
      1. Calculate the total area of the wall to be plastered in square metres (m2).
      2. Think about the plastering ratio and thickness.
      3. Calculate the Total Plastering Volume
      4. Calculate the volume of cement and sand for both coats separately.
      5. Determine the total amount of cement and sand needed for plastering.

      For the purposes of calculation, we will use the following values:

      The width and height of the wall are 10m and 10m, respectively.
      First plastering coat ratio (Cement:Sand = 1:5) with a thickness of 12mm.
      the thickness of the secondary coat of plastering (Cement:Sand = 1:3) and the ratio of the secondary coat of plastering (Cement:Sand = 1:3)

      Step 1: Calculate the Area of Plastering

      Area = width x height = 10 x 10 = 100m2

      Step 2: Find the Volume of Plastering 

      Volume of First Coat = Area of Plastering x Thickness of Plastering

      = 100m2 x 12mm (Convert mm to m)

      = 100×0.012 = 1.2m3

      Hence, Volume of First Coat of Plastering = 1.2m3

      The volume of Second Coat = Area of Plastering x Thickness of Plastering

      = 100m2 x 8mm (Convert mm to m)

      = 100×0.008 = 0.8m3

      Therefore Volume of Second coat of plastering = 0.8m3

      Step 3: Finding the individual quantities of Cement and Sand.

      First coat ratio = 1:5 (1 part of Cement and 5 parts of Sand)

      Total parts = 1+5 = 6

      Quantity of Cement required for First coat =

      (Total Volume of first coat plastering  x No. of Parts of cement) ÷ Total Parts

      = 1.2 x 1/6  = 0.2m3

      Quantity of Sand required for First coat =

      (Total Volume of first coat plastering x No. of parts of sand) ÷ Total Parts

      = 0.8 x 5/ 6 = 1.0m3

      Similarly for Second coat,

      Second coat ratio = 1:3 (1 part of cement and 3 parts of sand)

      Total parts = 1+3 =4

      Quantity of Cement required for Second coat

      = (Total Volume of second coat plastering  x No. of Parts of cement) ÷ Total Parts

      = 0.8 x 1/4 = 0.2m3

      Quantity of Sand required for Second coat

      = (Total Volume of second coat plastering x No. of parts of sand)÷ Total Parts

      = 0.8 x 3/4 = 0.6m3

      Step 4: Finding the quantity of water required for plastering:

      Amount of water to be added in mix depends upon the moisture content present in cement, sand & atmosphere.

      Quantity of water = 20% of total dry material (Cement+Sand)
      = 20% of (574+2560) = 0.2 x 3134 = 627 litres.

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