Plastering calculation in 100 sq ft & how much cement,sand is required, hi guys in this article we know about plastering calculation in 100 square feet area and also know about how much quantity of cement and sand is required for 100 square feet plastering.

**Plastering material cement and sand calculation in 100 sq ft depends on mostly two factors such as**

1) Thickness of Plaster

2) Mix Ratio (Cement:Sand)

**1) thickness of cement plaster** :- recommended thickness of cement plaster is 6 mm (for ceiling and concrete plastering), 12 mm (for internal wall plastering and plane surface of brickwork) & 15 mm or 20 mm (for external wall plastering and rough surface of brickwork) are used in building construction.

● 6 mm thick cement plaster are used for ceiling and concrete plastering

● 12 mm thick cement plaster are used for internal wall plastering and plane surface of brick wall

● 15 mm or 20 mm theek cement plaster used for external wall plastering and rough surface of brick wall

**2) mix ratio for cement plaster** : there are several types of mix ratio used for brick wall plastering, ratio of cement and sand for plastering depends on types of work and plastering types it is rough or plane surface.

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**Recommended** mix ratio of cement and sand for plastering of plane and rough surface of brick wall, concrete wall and ceiling are 1:3, 1:4, 1:5 & 1:6 are used.

● 1:3 mix ratio of cement and sand are used for plastering of external wall prone to sever climatic condition and for repairing work

● 1:4 mix ratio of cement and sand are used for external brick wall plastering and ceiling plastering

● 1:5 mix ratio of cement and sand are used for internal brick wall plastering when fine sand is not available

● 1:6 mix ratio of cement and sand are used for internal wall plastering when fine sand is available.

**Plastering calculation in 100 sq ft & how much cement,sand is required**

1) plastering calculation in sq ft for **external brick wall** :- For a Sample calculation, I will assume a 20mm thick plaster and a mix ratio of 1:4 for plastering of external brick wall

● Step-1: we know 10.763 sqft = 1 Sq m

So, 100 Sqft = 9.29 sq m

● Step-2: Volume of external wall plaster = Area X Thickness = 9.29 X 0.020 = 0.1858 cu m

Since wet volume is always less than the dry volume. For converting wet volume to dry volume of mortar we will multiply 1.33 into wet volume.

The dry volume of mortar required for external brick wall plastering = 1.33 X Dry volume of plaster = 1.33 X 0.1858 = 0.2471 cum.

● Step-3: The mix ratio of mortar is 1:4, So total ratio = 1+4 = 5 in which one part is cement and four part is sand

Cement required = 1/5 X 0.2471 = 0.0494 cu m ( cubic meter)

Sand required = 4/5 X 0.2471 = 0.198 cum

● Step-4: To get the weights of materials required in multiply it with its density

Cement required = 0.0494 cum X 1440 kg/cum = 71 Kgs

bags of cement = 71/50 = 1.42

Since Sand is usually measured in cft = 0.198 X 35.4147 = 7 cft

1.42 (71 kg) bags cement and 7 cu ft sand required for 100 sq ft area of external brick wall plastering.

**2) plastering calculation in sq ft for internal brick wall** :- For a Sample calculation, I will assume a 12mm thick plaster and a mix ratio of 1:5 for plastering of internal brick wall

● Step-1: we know 10.763 sqft = 1 Sq m

So, 100 Sqft = 9.29 sq m

● Step-2: Volume of internal wall plaster = Area X Thickness = 9.29 X 0.012 = 0.112 cu m

Since wet volume is always less than the dry volume. For converting wet volume to dry volume of mortar we will multiply 1.33 into wet volume.

The dry volume of mortar required for internal brick wall plastering = 1.33 X Dry volume of plaster = 1.33 X 0.112 = 0.149 cum.

● Step-3: The mix ratio of mortar is 1:5, So total ratio = 1+5 = 6 in which one part is cement and 5 part is sand

Cement required = 1/6 X 0.149 = 0.0248 cu m ( cubic meter)

Sand required = 5/6 X 0.149 = 0.124 cum

● Step-4: To get the weights of materials required in multiply it with its density

Cement required = 0.0248 cum X 1440 kg/cum = 36 Kgs

bags of cement = 36/50 = 0.72

Since Sand is usually measured in cft = 0.124 X 35.4147 = 4.37 cft

0.72 (36 kg) bags cement and 4.37 cu ft sand required for 100 sq ft area of internal brick wall plastering.

**3) plastering calculation in sq ft for ceiling & concrete** :- For a Sample calculation, I will assume a 6mm thick plaster and a mix ratio of 1:4 for plastering of ceiling & concrete

● Step-1: we know 10.763 sqft = 1 Sq m

So, 100 Sqft = 9.29 sq m

● Step-2: Volume of ceiling & concrete plaster = Area X Thickness = 9.29 X 0.006 = 0.0558 cu m

Since wet volume is always less than the dry volume. For converting wet volume to dry volume of mortar we will multiply 1.33 into wet volume.

The dry volume of mortar required for ceiling & concrete plastering = 1.33 X Dry volume of plaster = 1.33 X 0.0558 = 0.0742 cum.

● Step-3: The mix ratio of mortar is 1:4, So total ratio = 1+4 = 5 in which one part is cement and 4 part is sand

Cement required = 1/5 X 0.0742 = 0.01484 cu m ( cubic meter)

Sand required = 4/5 X 0.0742 = 0.060 cum

● Step-4: To get the weights of materials required in multiply it with its density

Cement required = 0.01484 cum X 1440 kg/cum = 22 Kgs

bags of cement = 22/50 = 0.44

Since Sand is usually measured in cft = 0.060 X 35.4147 = 2.12 cft

0.44 (22 kg) bags cement and 2.12 cu ft sand required for 100 sq ft area of ceiling & concrete plastering.

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