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Estimating Cement and Sand Quantity for Plaster Mix

Cement mortar is a well-known partner of concrete hollow blocks (CHB) and other masonry blocks. It's used for protective and decorative coating of walls. Cement plaster material quantity can be estimated in a variety of methods. One of the easiest and fastest ways to estimate cement plaster material quantity is also by area method.



HOW TO ESTIMATE THE QUANTITY OF CEMENT AND SAND FOR YOUR PLASTER MIX:


  1. Determine the specified thickness of plaster to be used:

  2. Plaster can be applied in varying thicknesses with the suggested thinnest thickness at 8mm and the thickest at 25mm.


  3. Determine the specified class of plaster mixture:

  4. Same with concrete, plaster’s compressive strength depends on your material’s mixture and proportions.


  5. Determine the wall area:

  6. Determine the area of your wall. The formula for a square wall is Length * Height.

    Square Wall Area = Length * Height

    Make sure to take into consideration the often-overlooked information that will affect the area of your wall – for example, the depth of your beam or the underground foundation CHB.


  7. Determine the number of faces to be plastered:

  8. Make sure to take into consideration how many wall faces are to be plastered.


  9. Based on the specified kind of mixture and plaster thickness, multiply your area with the corresponding values from the plaster proportion table:




SAMPLE PROBLEM 1


Compute for the quantity of cement and sand needed for a Class “B” plaster mix of a standard 4” CHB wall, plastered at both sides and is 3 meters high and 2 meters long.


SOLUTION

  1. Determine the specified thickness of plaster to be used:

  2. Specified plaster thickness = 16mm


  3. Determine the specified class of plaster mixture:

  4. Specified mortar mix = Class “B”


  5. Determine the wall area:

  6. Square Wall Area = Length * Height
    = 2m * 3m
    = 6m2


  7. Determine the number of faces to be plastered:

  8. Specified number of faces = 2 sides


  9. Based on the specified kind of mixture and plaster thickness, multiply your area with the corresponding values from the plaster proportion table:



  10. Quantity of Cement Bags = Area * Cement multiplier for a Class “B” mix
    = 6m2 * 0.192
    = 1.152 bags ~ 2 bags

    Quantity of Sand = Area * Sand multiplier for a Class “B” mix
    = 6m2 * 0.016
    = 0.096 m3



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