in this topic we know about how much quantity of cement and sand is required for 100 sq ft plastering work and cement mortar calculation for plastering and how to calculate cement sand quantity for plastering.

We know that plaster is a thin layer of mortar applied over the rough surface of brick wall and it act as a “**damp proof coat “**over the brick work.

plastering also provide fine and finish surface over the brick wall that is firm and smooth and it enhances the appearance of brick wall building. And also plaster is act as protection material for ceiling and brick wall against climatic factor and also remove surface Imperfection of brick wall and make it a smooth.

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According to binding material there are different types of plastering like **cement plaster lime, plaster and clay plaster.** basically today in modern time cement plaster is used for plastering of interior wall exterior wall and ceiling of building.

**Selection of right plastering material**

the right material that is used for plaster in surface protection against climatic change like heat ,temperature ,Earth pressure and sever weather condition and it is also a cheap and economical it can be durable and sustain climatic change and having excellent workability.

**What are different plastering thickness**

for calculating quantity of cement and sand is required for 100 sq ft plastering and cement mortar calculation for plastering work first we know about thickness of plastering.

Plastering thickness depends on rough and plane surfaces brick masonry work. Rough surface of brick masonry work require thick layer of plastering material 20 mm thick. Plane surface of brick masonry work require thick layer of plastic material 12mm and plane surface of ceiling plastering material require 8mm thick. so plastering thickness of brick masonry work ranging from 6 to 20 mm thick

●There are different types of plastering wall thickness, different plastering types there are different types of plastering wall thickness.

Plastering of the internal plane surface of brick masonary work known as internal plastering, apply single coat of **12 mm thick, so internal plastering thickness is 10mm to 12mm.**

Outer rough surface of brick masonary work is known as external plastering, applying double coat of **20 mm thick** layer, so external plastering thickness is 20mm in which first coat applied with 12 mm thick layer and after this second coat is applied with 8mm thick

plane surface of ceiling plastering of single coat is apply having** 6 mm thickness,so thickness of plastering for ceiling is 6 mm.**

Plastering thickness for brick wall is about 6mm to 20 mm in which their types external plastering thickness is 20 mm, internal plastering thickness is 12mm and ceiling plaster thickness is 6mm.

**cement sand mix ratio for plastering of brick masonry wall **

Mix ratio for plastering are different for different plastering types like external plastering, internal plastering and ceiling plastering of brick wall and concrete. Cement mix ratio for plastering depends on a rough and plane surface of brickwork.

**● plastering mix ratio 1:6 or 1:5 ( one part is cement and 6 part is sand) is used for internal plastering work for the plane surface of brick wall**

**● cement mix ratio for plastering 1:4 (1 part is cement and 4 part is sand ) is used for external plastering work for rough surface of brick wall**

**● plastering mix ratio 1:3 ( one part is cement and 3 part is sand) is used for external plastering where protection against abbrassive climatic condition and repair wall is needed and for ceiling plastering.**

Cement mix ratio for external plastering is 1:4 or 1:5, for internal plastering is 1:6 or 1:5 and for ceiling plastering is 1:3 is used for brick wall.

**How much quantity of cement and sand is required for 100 sq ft plastering **

How much **cement** required for 1 **sq.feet** area? Ans. 1.7 number of bags of cement required for 1 **sq.feet** area.

**How much sand required for 1 brass plaster?** **Ans**. It depends on thickness of plaster and we know 1 brass = 100 sq ft, so 5.5 to 8.5 cft quantity of sand required for 1 brass (100 sq ft) plaster.

**◆ steps for cement mortar calculation for plastering are following:-**

1) calculate surface area of plaster work

2) calculate dry volume of mortar needed

3) calculate quantity of cement

4) calculate quantity of sand

**Cement mortar calculation for internal plastering**

**Suppose length of room = 10ft**

**Width of room = 10 ft**

Area of plaster = 10×10=100 sq ft

Four easy calculation we should convert square feet into square metre

1sq ft = 0.0929 m2

100 sq ft = 100×0.0929 = 9.29 m2

Internal plastering thickness = 12 mm = 0.012m

Now volume = 9.29× 0.012 =0.11148 m3

Consider 20% extra volume of cement mortar used for joint filling and rough side surface and wastage

20% of 0.11148 = 0.022296 m3

Now total wet volume = 0.11148+ 0.022296

Wet volume = 0.133776 m3

Dry volume = wet volume× 1.33

Dry volume = 0.133776× 1.33= 0.278 m3

And mix ratio is 1:5 in which one part is cement and 5 part is sand and total proportion = 1+5 =6

**◆ cement mortar calculation for plastering**

Density of cement = 1440 kg/m3

One bag cement = 50 kg

Weight = volume × density

Weight of cement in kg

= (1× 0.178 m3 ×1440 kg/m3)/6=42.701 kg

No of bag cement = 42.701/50 = 0.86

● Ans. :- 0.86 number of bags (43 Kg) of cement is required for 100 square feet internal wall plastering of brick wall.

**How much sand required for 100 square feet plaster sand **

usually sand is calculated in cubic feet. So cubic metre is converted into cubic feet

1m3 = 35.32 cuft

Volume of sand in cubic feet

= (5 × 0.178× 35.32)/6 = 5.24 cft

● Ans. :- 0.86 no of bags (43 kgs) & 5.24 cu ft sand quantity required for 100 square feet plaster for internal brick wall plastering

**Cement mortar calculation for ceiling plastering**

100 sq ft = 100×0.0929 = 9.29 m2

Mortar thickness = 6 mm = 0.006m

Now volume = 9.29× 0.006 =0.05574 m3

Consider 20% extra volume of mortar used for joint filling and rough side surface and wastage

20% of 0.05574 = 0.011148 m3

Now total wet volume = 0.11148+ 0.05574

Wet volume = 0.66888 m3

Dry volume = wet volume× 1.33

Dry volume = 0.66888× 1.33= 0.089 m3

And mix ratio is 1:4 in which one part is cement and 4 part is sand and total proportion = 1+4 =5

**◆ cement quantity calculation for plastering**

Density of cement = 1440 kg/m3

One bag cement = 50 kg

Weight = volume × density

Weight of cement in kg

= (1× 0.089 m3 ×1440 kg/m3)/5=25.632 kg

No of bag cement = 25.632/50 = 0.51

**So quantity of cement is required for 100 square feet for ceiling plastering is about 0.51 number of bags of cement.**

**How much sand required for 100 sq ft plaster :-**usually sand is calculated in cubic feet. So cubic metre is converted into cubic feet

1m3 = 35.32 cuft

Volume of sand in cubic feet

= (5 × 0.089× 35.32)/5 = 2.5 cft

**Ans. quantity of material is required for 100 square feet for ceiling plastering is about 0.51 number of bags of cement and sand is 2.5 cft.**

**Cement mortar calculation for external wall plastering**

100 sq ft = 100×0.0929 = 9.29 m2

Mortar thickness = 20 mm = 0.02m

Now volume = 9.29× 0.02 =0.1858 m3

Consider 20% extra volume of mortar used for joint filling and rough side surface and wastage

20% of 0.1858 = 0.03716 m3

Now total wet volume = 0.1858+ 0.03716

Wet volume = 0.22296 m3

Dry volume = wet volume× 1.33

Dry volume = 0.22296× 1.33= 0.2965 m3

And mix ratio is 1:4 in which one part is cement and 4 part is sand and total proportion = 1+4 =5

**◆ Cement quantity calculation for plastering**

Density of cement = 1440 kg/m3

One bag cement = 50 kg

Weight = volume × density

Weight of cement in kg

= (1× 0.2965 m3 ×1440 kg/m3)/5=85.392 kg

No of bag cement = 85.392/50 = 1.707

So quantity of cement is required for 100 square feet for external wall plastering is about 1.707 number of bags of cement.

**◆ quantity of sand calculation** :- usually sand is calculated in cubic feet. So cubic metre is converted into cubic feet

1m3 = 35.32 cuft

Volume of sand in cubic feet

= (4 × 0.2965× 35.32)/5 = 8.378 cft

Ans. quantity of material is required for 100 square feet for external wall plastering is about 1.707 number of bags of cement and sand is 8.378 cft.

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