In this post, we are going to explain how to do quantity analysis for Materials, i.e quantities of cement and sand required for Cement Plaster.
Plaster is a building material used for the protective or decorative coating of walls and ceilings and for moulding and casting decorative elements. In English “plaster” usually means a material used for the interiors of buildings, while “render” commonly refers to external applications. Another imprecise term used for the material is stucco, which is also often used for plasterwork that is worked in some way to produce relief decoration, rather than flat surfaces. Among all the various types of plaster, Cement Mortar is most commonly used for plastering purpose.
Before we start…
Before beginning to work on quantity analysis for plaster, note down these general things-
- Cement Mortar Ratio for wall plastering 1:6
- Cement Mortar Ratio for ceiling plastering 1:4
- Plastering thickness should not be more than 12-15 mm. If there is a need for an additional coat don’t do that at one go.
- Ensure you are using good quality cement & Sand.
- Also, ensure you are using a measuring box (not the head pan) for site mix (Here is the basic 35 construction tools list)
How to calculate cement, sand quantity for Plastering?
Basic Concept for the Quantity Analysis
To determine the individual volume of cement and sand, their ratio is divided by the sum of the ratio, then multiplied with the total volume of the mortar. Then they are multiplied by their unit weight if we need to determine in terms of weight.
For a better understanding, we are going to do this calculation for 100 sq.m area.
To calculate the cement and sand for 100 m2 plastering area in 1:6 ratio and 12 mm thickness.
Cement Mortar Required:
Plastering thickness 12 mm = 12/1000 = 0.012 m
Volume of cement mortar required = (Plastering Area x thickness )
= 100 m2 x 0.012 m = 1.2 m3
This is the wet volume that means we need this much volume of cement mortar after mixing water, So for dry volume, we have to add 30-35% as bulkage of sand, we are using 35% and wastage as 25% as wastage in plaster is more.
Consider 35% Sand Bulkage = 1.2 m3 x (1.0+0.25+0.35) (Many of us would use 1.60 as constant)
= 1.92 m3
Cement : Sand (Ratio) = 1 : 6 ( Total = 1+6 = 7 Parts )
Calculation for Cement
Cement required (1 Part) = 1.92 x 1/7
= 0.2740 m3 /0.0347
= 7.90 bags
= 8 bags (Say)
Calculation for Sand
Sand required (6 Part) = 1.92 x 6/7
= 1.646 m3
We normally use Sq.m while calculating plastering cement mortar. If you want to calculate it in Sq.ft, just convert that sq. ft into Sqm using Google Instant Area Conversion Tool and then use this formula.
I hope this article will help you on how to determine the quantity of cement and sand required for 100 sq.m player work with cement mortar. You may also want to see my other post from my Blog. If I have missed anything here, please let me know about that in the comment below this post.
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