How to Calculate Cement, Sand Quantity for Plaster - civil engineer vijay technical

 

This post, we are going to explain you, How to Calculate Cements, Sand Quantity for Plaster?

Please notes, before using the calculator embedded in this post understand the plaster cements mortar calculation concept.

Before beginning to work on the plaster calculation, note down these general thingsCement Mortar Ratio for wall plastering 1:6 Cement Mortar Ratio for ceiling plastering 1:4 Plaster 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 of cements & Sand (In silt content test, we have discussed how bad sand quality affects the work)

Also, ensure you are use measuring box (not head pan) for site mixing ( Here is the basic constructions tool list) Please do reads the plastering checklist post for the complete list.

Plaster Work Ratio Calculation

For a better understand, we are going to do this calculation for 100 Sq.m area.To calculate the cement and sand for 100 m2 plaster area in 1:6 ratio and 12 mm thickness.

Cement Mortar Required:

Plaster thickness 12  mm     =  12 / 1000  =  0.012m Volume of cement mortar required = ( Plaster Area x thickness ) =  ( 100  m2  x  0.012m  =    1.2 m3 ) 

(This is wet volume thats means we need this much volume of cements mortar after mixing water, So for dry volume, we have to add 30-35% as bulkage of sand, we are use 35% and wastage as 20%) Consider 35% Sand Bulkage     =  1.2 m3 x (1+0.2+0.35) (Many of us would use 1.54 as constants)

 = 1.86 m3 Cements  : Sand  (Ratio)   = 1 : 6   ( Total = 1+6   = 7 Part ) Cements  required  (1 Part)  = 1.86 x  1/7 = 0.265 m3 /0.0347  = 7.66 bag (Approx – 8 Bag) Sand  required   = 1.86 x 6/7  = 1.59 m3