How to Calculate Quantity of Material For Plaster | Measurement of Plastering Quantities | Material for 20 mm Thick Plastering in Wall for 100 Sq.m.

How to Calculate Quantity of Material for Plaster?

Plastering is the practice of coating rough walls and uneven surfaces in the building of houses and other buildings with a plastic substance, called plaster, which is a combination of lime or cement concrete and sand together with the requisite quantity of water.

1. It should stick to the context and should stay adhered to throughout all climatic changes.
2. It should be inexpensive and economical.
3. It should be sturdy and strong.
4. It should be possible to extend it during all weather conditions.
5. It can accurately monitor the entry or infiltration of moisture from the surfaces.
6. It should possess decent workability.
7. It is also used for maintenance works.

The objective of plastering is to have an even, smooth, normal, clean, and durable finish. There are several various kinds of plastering materials out them, cement plaster is extensively used. Any other examples of plastering materials include lime plaster, clay plaster, etc.

Calculating the Quantities of Cement & Sand Required for Plastering:

1. The ratios described in plastering are volumetric ratios of Cement and Sand. Cement: Sand = 1:5 that is 1 part of cement and 5 pieces of sand in a mortar.
2. The average thickness of plastering should also be a minimal 20 mm which includes two coats.
3. Cement does have a dry density volume of 1440 Kg/m³
4. Also every bag of cement weights = 50 Kg. or 110 lbs.
5. The Volume of every cement bag = ( 50 Kgs )/ (1440 Kg/m³) = 0.0348 m³.
6. The dry density of sand = 1600 Kgs/m³
7. The plastering is performed in two layers (two coats): The first coat of plastering is placed with both the thickness of a minimum of 12  mm ( normally varies from 12 to 15 mm ) yet this coat is named as a rough coat or primary coat.
8. The second coat can be placed with both the thickness of 8 mm but this is named as a Finish coat or Secondary coat of plastering.
9. Total Plastering = First coat + Second Coat

Proportions of Cement mortar used during plastering are computed following table:

• 1:6 & 1:5 = Used for Internal plastering of bricks.
• 1:4 = Used for Ceiling and external walls.
• 1:3 = Used for external walls are prone to severe climatic conditions.

Measurement of Plastering Quantities

Steps used in the measurement of plastering quantities are as follows.

1. Find the entire area of the wall to only be plastered in Sqm (m²).
   • Area = Distance x Height
2. Find the ratio as well as thickness of plastering.
   • Ratio of First coat of plastering ( Cement: Sand = 1:5 ) only with a thickness of 12 mm.
   • Ratio of a secondary coat of plastering ( Cement: Sand = 1:3 ) only with a thickness of 8 mm.
3. Calculate the Total Volume of Plastering.
   • The volume of First Coat = Area of Plastering x Thickness of Plastering.
   • The amount of Second Coat = Area of Plastering x Thickness of Plastering.
4. Calculate the Volume of Cement and Sand independently for mutually the coats.
5. Quantity of Cement.
   • First coat= ( Total Volume of first coat plastering x No. of Parts of cement ) ÷ Total Parts
   • Second coat = ( Total Volume of second coat plastering  x No. of Parts of cement ) ÷ Total Parts
6. Quantity of Sand.
   • First coat= ( Total Volume of first coat plastering x No. of parts of sand ) ÷ Total Parts
   • Second coat = ( Total Volume of second coat plastering x No. of parts of sand ) ÷ Total Parts
7. Compute the total volume of cement & Sand essential for plastering.
8. Outcome the quantity of water compulsory for plastering:
   • Amount of water to be more in mix be determined by upon the moisture content existent in cement, sand, and atmosphere.
9. Quantity of water = 20 % of total dry material. ( Cement + Sand )

Material for 20 mm Thick Plastering in Wall for 100 Sq.m.

• Area of plastering work = 100 m²
• The thickness of plastering = 20 mm.
• by converting millimeter into meter by dividing with 1000
• Thickness = 20 / 1000 = 0.02 m
• Volume of plastering = 100 m² × 0.02 m
• Volume of plastering work = 2 m³
• In plastering process some amount of cement mortar quantity get wastage we consider about 20 % of mortar wastage.
• 20 % of 2 m³ = 0.4 m³
• Total volume of mortar required for exterior brick wall plaster = 2 m3+ 0.4 m3 = 2.4 m²
• measure dry volume of cement mortar for measuring multiply with cofactor 1.33 in wet volume of cement mortar.
• Dry volume = 1.33 × 2.4 m3 = 3.192 m²
• Now blend ratio for exterior brick wall plastering is around 1:4
• Total ratio = 1 + 4 =5
• Part of cement = 1/5
• Part of sand = 4/5

Quantity of Cement Required for Brick Wall Plastering

• Weight of cement = 1/5 × Volume × Density
• Weight of cement = 1/5 × 3.192 m³ × 1440 m³/kg
• Weight of cement = 919.296 kg
• Part of cement = 1/5
• Dry volume of mortar = 3.192 m³
• Density of cement = 1440 kg / m³
• 1 bag cement = 50 kg
• Quantity of bags of cement = 919.296/ 50
• Quantity of bags of cement = 18.38
• Therefore, 18.38 quantity of bags cement necessary for 100 sq.m of external brick wall plastering.

Quantity of Sand Required for 100 Sq.m. Brick Wall Plastering

• 1 m3 =  35.32 cu.ft.
• Part of sand = 4/5
• Mortar quantity = 3.192 m³
• By converting mortar quantity in cubic meter into cubic feet, multiply with 35.32
• Volume of sand = 4/5 × 3.192 × 35.32 cu.ft.
• Volume of sand = 90.19 cu.ft.
• 90.19 cubic feet of sand is essential for 100 sq.m. of external brick wall plastering.

Mode of Measurement for Wall Plaster as Per Is 1200 Part -12

1. Plastering on rooftops, roofs and dividers will be estimated independently.
2. Eliminating mortar by scratching or in any case will be estimated independently in square meters.
3. Plastering in confined widths or in widths not shaping piece of general plastering work ( as in groups, moldings, sunk, boards, and so forth ) and in chamfers, adjusted angles surpassing 80 mm in circumference will be estimated as underneath.
   1. 30 cm or underneath in width/size, in running meters; and
   2. Width/size over 30 cm in square meters.
4. Plastering at a height larger than 10 m beyond ground/ datum level intends to be measured independently in phases of 5 m height excluding interior plastering in scenario of a building which will be measured individually for respectively storey.
5. All plastering will be estimated in square meters except if in any case portrayed.
6. Slicing to edges will be estimated independently in running meters or then again depicted and remembered for the thing.
7. Estimation of divider plastering will be taken between dividers or parcels ( measurements prior to plastering being taken ) for length and from top of floor or evading to roof for tallness. Profundity of moldings or bays, assuming any, will be deducted.
8. Sides of pilasters, projections, and so on, will be added to mortar on dividers.
9. Moldings, architraves, roof ribs, moldings, and so forth on pilasters and around openings, and so on, will be estimated independently.
10. Length will be estimated in running meters at the focal point of size. Bigness will be estimated along bend of trim.
11. Shaped moldings and bays will be estimated in square meters, the zone being shown up at by duplicating length by bigness.
12. Framing letters or figures in mortar will be specified expressing the stature.
13. Plastering on lathing will be estimated independently expressing the quantity of coats and thickness of each coat.
14. Lathing will be completely depicted and estimated net; wood and steel lathing will be estimated independently individually.
15. Laps, check and lattice of steel lathing will be expressed, no stipend being made for laps or cutting.
16. Size of laths, their distance separated and the sort of lumber will be expressed on account of wood lathing.
17. Connector lathing will be estimated independently.
18. Plastering on honeycomb work will be portrayed and estimated in square meters based on in general shallow territory without deducting openings.

Ceiling Plastering 12 3m Thick for 100 Sq.m.

Intended for plastering in Reinforced concrete cement ceiling, the roughness of external will be a reduced amount of and 20 % additional mortar might be occupied to get smooth surface.

• Quantity of wet mortar = 100 × 0.12 + 20%
• Quantity of wet mortar = 1.2 + 1.4
• Quantity of wet mortar = 2.6m³
• Cumulative 25 % for dry volume
• Dry volume of mortar = 1.44 + 0.36
• Dry volume of mortar = 1.80
• Ratio of Cement Mortar = 1:4

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How to Calculate Quantity of Material for Plaster?

• Quantity of Cement = 2/(1+6) × 1 = 0.30 Cu.m. (1 Ratio of cement)
  • Cement In Kg = 0.30 × 1440 = 432 Kg (Density of cement = 1440 kg/m3)
• Quantity of  Sand = 2/(1+6) × 6 = 1.80 Cum (6 Ratio of sand)
  • Sand In Kg = 63.558 cft (1 Cum = 35.31 cft)
• Water Required = Cement quantity in Kg × 0.5  = 432 x 0.5 = 216 liter (water cement ratio = 0.5)

Calculating the Quantities of Cement & Sand Required for Plastering

• Quantity of Cement = 2/(1+6) × 1 = 0.30 Cu.m. (1 Ratio of cement)
• Quantity of  Sand = 2/(1+6) × 6 = 1.80 Cum (6 Ratio of sand)
• Water Required = Cement quantity in Kg × 0.5  = 432 x 0.5 = 216 liter (water cement ratio = 0.5)

Measurement of Plastering Quantities

For wall plaster generally ratio we use = 1: 6 (1 part of cement and 6 part of sand). For Roof plaster mainly ratio we use = 1: 4 (1 part of cement and 4 part of sand). The thickness of plaster is between = 12 mm to 15 mm. Always use Good quality of cement (Different grades of cement) as well as good quality sand.

How Much Cement Is Required to Plaster a Wall?

Quantities of Cement, Sand and Water in Various Plaster Mix ratios

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Area (Sq.m.)	Plaster thickness (mm)	Mix Ratio of Mortar	Cement (in Kg)	Sand (In cft)	Water (in Kg)
10	12	1:3	49.37	3.77	44
10	12	1:4	39.29	3.99	44
10	12	1:5	32.54	4.14	44
10	12	1:6	27.8	4.24	44

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