How to calculate the Quantity of Sand and Cement in Plastering ?

Cement

Sand

Plastering

Plastering is done on the walls to remove surface imperfections, maintain line level and alignment. In addition to that it also acts as a protective surface for external walls. Cement plaster, Gypsum plaster and Lime plaster are the commonly used plastering materials for house constructions. Cement plaster is made by mixing cement and sand in the proportions required. Cement plaster is applied to both interior and exterior walls to give them a smooth surface.

Recommended Cement Mortar ratio for Plastering:

Now lets see how to calculate the quantity of Cement and Sand for Plastering .
For some better Knowledge  , We are now Calculating for 100 SqMtrs of Plastering Area with 12mm Thickness .

Cement Mortar Required :

Plastering Thickness = 12 mm = 12/1000 = 0.012 M

Volume of cement mortar required = (Plastering Area x                                                                                              thickness)
                                                        = 100 m2 * 0.012 m
                                                             = 1.2 m3 .

(This is 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 20%) .

                                  = 1.2 * (1+0.35+0.2)
                                  =  1.2 * 1.55
                                  =  1.86 M3

Cement : Sand (Ratio) = 1 : 6 ( Total = 1+6 = 7 Parts ) .

      Cement Required     = 1/7 * 1.86 
                                       
                                        = 0.256 M3

1 Cement Bag = 50 kgs = 0.0347 M3

                                       = 0.256 / 0.0347 
                                       
                                       = 7.4  Bags (Appox 8 Bags) .

          Sand Required     = 6/7 *1.86
   
                                       = 1.59 M3 .