To calculate the quantity of material for plaster, you need to determine the surface area to be plastered and the thickness of the plaster coat.
The formula is: Plaster Quantity = Surface Area × Plaster Thickness/ Coverage of Plaster per unit volume
Make sure to convert all measurements to the same units (e.g., square meters for area and millimeters for thickness). The coverage of plaster per unit volume is the amount of plaster needed to cover one unit of volume, typically provided by manufacturers.
Keep in mind that this is a general formula, and factors like waste, uneven surfaces, or additional layers may affect the actual amount needed.
Hi guys in this article we know about how to calculate the quantity of plaster & different types of plaster cement and sand ratio for external brick wall plastering, internal wall plastering, concrete wall plastering, ceiling plastering & roof plastering.
Plastering is thin layer of cement mortar adhesive material put over the brick wall for protection from environment ,smooth surface, good finishing, good looking & increasing the strength of brick wall.
We know that external part of brick wall is more prone to sever climatic condition, its needs more protection from outer side, plastering make it strong and damp proof and prevent from seepage of water in brick wall.
Plastering is the term used to describe the cement mortar material spread over the both face plane and rough surface of irregular and coarse textured brick wall,beam, roof,column, concrete wall and ceiling to make it stronge, more durable,provide a smooth, hard and leveled finish surface which can be painted for good appearance.
In actual Plastering process is an art, truly recognized for constructing the base. It refers to the construction done with cement plaster which includes a layer of plaster on an interior wall or plaster decorative moldings done on ceilings or walls. The process of creating plasterwork is known as Plastering.
Plastering is a unique skill to plaster the brick wall, leveling it and achieve a good and even finishing. Plasterboard is to form the sub-base for ceilings, partition walls. An adequate and rigid frame made up of timber battens is needed for it.
Fix runner boards made from spare lengths to harden the ceiling side by side. It will provide ease of access in the roof void and will be supporting for electrical cables.
According to a adhesive material there are four types of plastering :- 1) Lime plaster,2) cement plaster,3) clay plaster & 4) gypsum plaster.
1) Lime plaster:- plaster in which lime is used as Adhesive or binding material for mortar
2) cement plaster:– plastic in which cement is used as Adhesive or binding material for mortar
3) clay plaster:- plaster in which clay is used as adhesive or binding material for mortar
4) gypsum plaster :- plaster in which gypsum material is used as adhesive or binding material for mortar.
According to type of wall, plastering is following types 1) external wall plastering, 2) internal wall plastering, 3) concrete wall plastering & 4) roof for ceiling plastering.
1) plastering of outer face or rough face of brickwork and concrete walls is known as external wall plastering.
2) plastering of inner face or plane face of brickwork and concrete walls is known as inner wall plastering.
3) plastering of concrete structure like column and beam is known as concrete wall plastering
4) plastering of bottom face of roof or ceiling is known as roof or ceiling plastering
Recommended plaster cement sand ratio are 1:3 (for repair),1:4 (for external wall,ceiling, roof & concrete plastering), 1:5 (internal brick wall plastering have no fine sand) & 1:6 (for internal brick wall plastering whick have fine sand) general used in civil engineering & building construction.
How to calculate the quantity of material for plaster
Consider we have given 10 metre long and 10 height of brick wall, in which cement mortar thickness is 20mm for external plastering and there cement sand ratio is 1:4, let us explain how to calculate the quantity of material for external wall plaster and how much cement sand do i need for 100 m2 external wall plaster in following steps:-
● Thickness 20mm, area 100m2 & mix ratio is 1:4:- Consider we have given 10 metre long and 10 height of brick wall, in which cement mortar thickness is 20mm for external plastering and there cement sand ratio is 1:4.
● Wet volume of plaster is 2m3:- we have given brick wall 10m long and 10 metre height and thickness of external plastering is about 20mm, then wet volume of plaster = 10m × 10m× 0.020m = 2 cubic meter.
● Dry volume of plaster 2m3×1.33 = 2.66m3:- now converting wet volume of plaster in dry volume, dry volume is increased by 33% of wet volume, so we will multiply 1.33 into wet volume to get dry volume, so dry volume= 2m3× 1.33 = 2.66m3.
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● Cement for plaster is 1/5 × 2.66× 1440 = 766kg or 15.32bags:- we have recommended mix ratio for external plaster is about 1:4 (cement: sand), total proportion is 1+4 =5, parts of cement in mix is 1/5 and parts of sand in mix is 4/5, so cement quantity = 1/5 × 2.66× 1440 = 766kg, 1 bag of cement is weight around 50 kg, so bag of cement 766/50 = 15.32 bags.
● Sand for plaster is 4/5× 2.66× 35.32 = 75 cu. ft:- parts of sand in mix is 4/5, we know 1m3= 35.32 cubic feet, so sand quantity = 4/5× 2.66× 35.32 = 75 cu. ft, so we needed 75 cubic feet of sand.
● Water quantity needed 530 Litres: amount of water to be added in mix depends upon moisture content present in sand, cement and in atmosphere, generally we need water quantity as 20% of dry volume of material cement and sand, so 20% of 2.66m3= 0.530m3, we know 1m3= 1000 litres, hence we need 0.530m3= 530 Litres water.
You need material about 766kg (15.32 bags of 50kg) of cement, 75 cft (3.4MT) sand and 530 litres of water quantity for 100m2 area of external plastering having thickness 20mm and cement mix ratio 1: 4 (1 parts cement and 4 parts sand) is used.
How to calculate the quantity of material for internal wall plaster
Consider we have given 10 metre long and 10 height of brick wall, in which cement mortar thickness is 12mm for internal plastering and their cement sand ratio is 1:6, let us explain how to calculate the quantity of material for internal wall plaster and how much cement sand do i need for 100 m2 internal wall plaster in following steps:-
● Thickness 12mm, area 100m2 & mix ratio is 1:6:- Consider we have given 10 metre long and 10 height of brick wall, in which cement mortar thickness is 12mm for external plastering and there cement sand ratio is 1:6.
● Wet volume of plaster is 2m3:- we have given brick wall 10m long and 10 metre height and thickness of external plastering is about 12mm, then wet volume of plaster = 10m × 10m× 0.012m = 1.2 cubic meter.
● Dry volume of plaster 1.2m3×1.33 = 1.6m3:- now converting wet volume of plaster in dry volume, dry volume is increased by 33% of wet volume, so we will multiply 1.33 into wet volume to get dry volume, so dry volume= 1.2m3 × 1.33 = 1.6m3.
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● Cement for plaster is 1/7 × 1.6× 1440 = 329 kg or 6.58 bags:- we have recomended mix ratio for internal plaster is about 1:6 (cement: sand), total proportion is 1+6 =7, parts of cement in mix is 1/7 and parts of sand in mix is 6/7, so cement quantity = 1/7 × 1.6× 1440 = 329kg, 1 bag of cement is weight around 50 kg, so bag of cement 329/50 = 6.58 bags.
● Sand for plaster is 6/7× 1.6× 35.32 = 48.5 cu. ft:- parts of sand in mix is 6/7, we know 1m3= 35.32 cubic feet, so sand quantity = 6/7× 1.6× 35.32 = 48.5 cu. ft, so we needed 48.5 cubic feet of sand.
● Water quantity needed 320 Litres: amount of water to be added in mix depends upon moisture content present in sand, cement and in atmosphere, generally we need water quantity as 20% of dry volume of material cement and sand, so 20% of 1.6m3= 0.320m3, we know 1m3= 1000 litres, hence we need 0.320m3= 320 Litres water
You need material about 329kg (6.58 bags of 50kg) of cement, 48.5 cft (2.2 MT) sand and 320 litres of water quantity for 100m2 area of internal plastering having thickness 12mm and cement mix ratio 1: 6 (1 parts cement and 6 parts sand) is used.