# How to Calculate Quantity of Material For Plaster?

## How to Calculate Quantity of Cement, Sand and Water For Plastering

The term plastering is used to describe the thin mortar covering that is applied on the surface of the wall and ceiling.

The plastering removes the unevenness of the surface and is sometimes used to develop decorative effects. Today in this article we will learn how to calculate quantity of material for plaster.

## Important Points For Estimation

Density of Cement                                     =  1440 kg/ m3

Density of Sand                                          =  1450 – 1500 kg/ m3

Density of Aggregate                                 =  1450 – 1550 kg/ m3

Quantity or Weight of Cement in 1 Bag   =   50 KG

The volume of 1 Bag Cement in Cum       =   0.03472 cubic meter

The volume of 1 Bag Cement in Cft          =   1.226 cubic feet

Numbers of Cement Bags in 1 cum           =    28.8 nos.

How many Cft in 1 Cum                            =   35.31 cft

## Calculation of quantity of material for 12 mm thick plaster of ratio 1: 6 (1 Cement:6 Sand) in the wall for 100 Sqm

The volume of mortar  =  Area × Thickness

=    100   × 0.012

=     1.2

Adding 30% to fill up joints, uneven surface etc

Wet Volume of Mortar =  1.2 + 0.36

=   1.56 Cum

Increasing 25% for dry volume

Total Dry Volume       =   1.56 + 0.39

=    1.95

=    2 Cum (say)

Quantity of Cement  =    2/(1+6) × 1             (1 Ratio of cement)

=  0.30 Cum

In Kg                           =   0.30 × 1440           (Density of cement = 1440 kg/m3)

=    432 Kg

In Bags                        =    8.64 bags

Quantity of  Sand      =    2/(1+6) × 6              (6 Ratio of sand)

=     1.80 Cum

In Cubic Feet              =      63.558 cft               (1 Cum = 35.31 cft)

Water Required        =    Cement quantity in  Kg × 0.5        (water cement ratio = 0.5)

=        432 × 0.5

=         216 Litres

Alternative Method

Quantity of Sand    =  Cement bags × Sand ratio ×1.226  (Volume of one bag cement = 1.226 cft)

=          8.64  ×  6  ×  1.226

=             63.55 cft

Similarly, The quantity of materials for other proportions may be calculated.

## Material For 20 mm thick Plastering in the wall for 100 sqm

As the thickness of plaster is more, 20% of mortar may be taken to fill up the joints, unevenness etc.

The Quantity of wet Mortar  =  100 × 0.02 + 20%

=  2 + 0.4

=    2.4 cu m

Increasing 25% for the dry volume of mortar

Dry Volume of Mortar  =  2.40 + 0.60

=        3.00 cu m

The quantities of each material of mortar may be found by the usual method as discussed above.

Also, ReadRate Analysis for Cement Plaster.

## Rich Mortar

For rich mortar plastering, the quantities of material will be less as the cement will be in excess than the voids in sand and the reduction in the volume of dry mortar will be less.

## Ceiling Plastering 12 mm thick for 100 sqm

For plastering in the RCC ceiling, the unevenness of the surface will be less and 20% extra mortar may be taken to get an even surface.

The quantity of wet mortar  =  100 × 0.12 + 20%

=   1.2 + 1.4

=     2.6 cu m

Increasing 25% for dry volume

The dry volume of mortar    =   1.44 + 0.36

=       1.80

The quantities of each material of mortar may be found by the usual method as discussed above.

For 6 mm thick plastering in RCC, the quantity of dry mortar may be taken as 1.00 cum.

Also, ReadRate Analysis for Gypsum Plaster.

## General Notes

The ratio of Cement Mortar for Wall Plastering      =   1:6

The ratio of Cement Mortar for Ceiling Plastering  =   1:4

The thickness of the Internal Wall Plastering          =    12 to 15 mm

The thickness of the External Wall Plastering          =    15 to 20 mm

The thickness of Plastering on the Concrete Face       =     6 to 8 mm

## Mode of Measurement For Wall Plaster As Per IS 1200 Part – 12

1. For opening less than 0.5 square meters, no deduction shall be made, and no addition shall be made for reveals, sills, soffits, jambs, etc.,
2. For opening greater than 0.5 square meters but less than 3 square meters, 50% or half ( one side) deduction shall be made, and no addition shall be made for reveals, sills, soffits, jambs, etc.,
3. For opening bigger than 3 square meters, full deduction or 100% ( both sides) shall be made, and addition should be made for reveals, sills, soffits, jambs, etc.,

When Internal and External plaster thicknesses are different, then addition for reveals, sills, soffits, jambs, etc., shall be made as follow.

• When windows are located at the wall’s external face, then added for reveals, jambs, soffits, sills, etc., shall be made as per internal plaster thickness.
• When windows are located at the wall’s internal face, then added for reveals, jambs, soffits, sills, etc., shall be made as per external plaster thickness.
• When windows are located at the wall’s middle face, then added for reveals, jambs, soffits, sills, etc., shall be made as per internal plaster thickness for inner and external plaster thickness for the outer side. If the opening falls under 0.3 to 5 square meters then a 50% deduction shall be made from both sides.

If there is no plaster done for reveals, sills, soffits, jambs, etc., then 100% deduction shall be made for all size openings.

## Conclusion

So, friends, I hope I have covered all the information about how to Calculate Quantity of Cement, Sand and Water for Plastering in this article.

If you learn something, please be sure to share it with someone who might benefit from it.

If you want to add any information which has been missed in this article you can mention it in the comment section.

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## 8 thoughts on “How to Calculate Quantity of Material For Plaster?”

1. Thanks a lot

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2. This is wonderful, many thanks.

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