## 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.

- It should stick to the context and should stay adhered to throughout all climatic changes.
- It should be inexpensive and economical.
- It should be sturdy and strong.
- It should be possible to extend it during all weather conditions.
- It can accurately monitor the entry or infiltration of moisture from the surfaces.
- It should possess decent workability.
- 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:

- 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.** - The average thickness of plastering should also be a minimal 20 mm which includes two coats.
- Cement does have a dry density volume of 1440 Kg/m
^{3} - Also every bag of cement weights = 50 Kg. or 110 lbs.
- The
**Volume of every cement bag = ( 50 Kgs )/ (1440 Kg/m**^{3}) = 0.0348 m^{3}. - The dry density of sand = 1600 Kgs/m
^{3} - 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.
- 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.
- 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.

- Find the entire area of the wall to only be plastered in Sqm (m
^{2}).- Area = Distance x Height

- 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.

- 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.

- Calculate the Volume of Cement and Sand independently for mutually the coats.
- 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

- 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

- Compute the total volume of cement & Sand essential for plastering.
- 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.

- 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 m
^{2} - 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 m
^{2}× 0.02 m - Volume of plastering work = 2 m
^{3} - In plastering process some amount of cement mortar quantity get wastage we consider about 20 % of mortar wastage.
- 20 % of 2 m
^{3}= 0.4 m^{3} - Total volume of mortar required for exterior brick wall plaster = 2 m3+ 0.4 m3 = 2.4 m
^{2} - 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 m
^{2} - 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 m
^{3}× 1440 m^{3}/kg - Weight of cement = 919.296 kg
- Part of cement = 1/5
- Dry volume of mortar = 3.192 m
^{3} - Density of cement = 1440 kg / m
^{3} - 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 m
^{3} - 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

- Plastering on rooftops, roofs and dividers will be estimated independently.
- Eliminating mortar by scratching or in any case will be estimated independently in square meters.
- 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.
- 30 cm or underneath in width/size, in running meters; and
- Width/size over 30 cm in square meters.

- 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.
- All plastering will be estimated in square meters except if in any case portrayed.
- Slicing to edges will be estimated independently in running meters or then again depicted and remembered for the thing.
- 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.
- Sides of pilasters, projections, and so on, will be added to mortar on dividers.
- Moldings, architraves, roof ribs, moldings, and so forth on pilasters and around openings, and so on, will be estimated independently.
- Length will be estimated in running meters at the focal point of size. Bigness will be estimated along bend of trim.
- Shaped moldings and bays will be estimated in square meters, the zone being shown up at by duplicating length by bigness.
- Framing letters or figures in mortar will be specified expressing the stature.
- Plastering on lathing will be estimated independently expressing the quantity of coats and thickness of each coat.
- Lathing will be completely depicted and estimated net; wood and steel lathing will be estimated independently individually.
- Laps, check and lattice of steel lathing will be expressed, no stipend being made for laps or cutting.
- Size of laths, their distance separated and the sort of lumber will be expressed on account of wood lathing.
- Connector lathing will be estimated independently.
- 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**= 2.6m^{3}- 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

## Frequently asked questions (FAQs) that could be included in your article:

**What is plastering and why is it important in construction?**

Plastering is the process of applying a smooth, even layer of plaster mix onto walls and surfaces in construction. It is crucial as it enhances aesthetics, provides protection against weather elements, and improves durability.

**What materials are typically used for plastering?**

Common materials include cement, sand, lime, and sometimes additives for specific properties like workability or water resistance.

**How do you calculate the quantity of cement and sand required for plastering?**

The quantities depend on factors like the area to be plastered, thickness of plaster, and the mix ratio of cement to sand. Typically, ratios like 1:5 (cement

) for base coat and 1:3 for finish coat are used. Detailed formulas are used to calculate volumes based on these factors.

**What is the importance of thickness in plastering?**

Thickness ensures a uniform finish, provides adequate coverage for the underlying surface, and affects the overall strength and durability of the plaster.

**How do climatic conditions affect plastering?**

Extreme weather conditions can impact the setting time and curing process of plaster. Proper protection and curing methods are essential to ensure a strong and durable finish.

**What precautions should be taken during the plastering process?**

Precautions include ensuring a clean and stable base surface, using correct mixing ratios, proper curing to prevent cracks, and protecting freshly plastered surfaces from direct sunlight and rain.

**How does wastage factor into material calculations for plastering?**

Wastage, typically estimated around 20%, should be considered when calculating the total quantity of materials required for plastering to account for losses during mixing, application, and cleanup.

**What are the different types of plastering techniques used in construction?**

Techniques vary based on the surface and finish required, including rough plastering, smooth plastering, and specialized techniques like decorative or textured finishes.

**How does the quality of materials affect the outcome of plastering?**

Quality materials ensure better adhesion, strength, and longevity of plaster. Using inferior materials can lead to issues like cracking, poor finish, and reduced durability.

**What are the key steps in the plastering process?**

Steps typically include surface preparation, mixing of materials, application of base and finish coats, curing, and final finishing touches.