Rate analysis for plastering work - Estimating and Costing of Material and labour -lceted LCETED INSTITUTE FOR CIVIL ENGINEERS

## Sep 8, 2022

Plaster is a mixture of building materials such as cement, sand and waterproofing admixtures (if need) which is used to coat walls and ceilings. Cement and sand are mixed with water using a mix ratio to form a plaster material

Also read: What is the cost of plastering the walls? Plastering Material & Labour Cost

Types of Plastering:

·       Interior Plastering

·       Exterior Plastering

·       Ceiling Plastering

·       Water-proofing Plastering

The following points have to be considered while Plastering work Rate analysis

1.  Manpower wages + including their transportation

2.  Labour Output per day

3.  Material Required + wastage

4.  Power + Water Consumption

5.  Charges for Supervision

6.  Scaffoldings/Equipment and Tools

7.  Incidental expense

8.  Contractor profit

OK, Lets take rate analysis of plastering for data

Area = 10 sqm

Mix ratio = 1:6

Thickness = 15mm - 0.015m

Rate Analysis of Plastering

Step 1: Material calculation

Cement calculation

Volume of mortar = Area x thickness + (10% Extra for uneven surface)

Volume of mortar = (10 x 0.015) + 10% = 0.165cum

So,

Dry Volume of Mortar = 1.22 x 0.165 = 0.2013 cum

Given a mortar mix ratio of 1:6 therefore, one part of cement is mixed with six parts of sand

Volume of cement = 1/(1+6) = 0.142857 cum

Volume of cement = 0.2013 x 0.142857 = 0.0287 cum

Cement Required in weight = Volume x density = 0.0287 x 1440 = 41.328

Cement Required in weight = weight in kg/50kg = 41.328/50 = 0.82 – 1 bags

Sand calculation

Volume of sand = 6/(1+6) = 0.8571 cum

Volume of sand = 0.2013 x 0.8571= 0.1725 cum

Sand Required in weight = Volume x density = 0.1725 x 1650 = 284.62kg

Sand Required in Cft = 0.1725 x 35.31 = 6.0909 cft (As we know that 1m3 = 35.31 CFT)

Also use plastering material calculation excel sheet

Step 2: Labour calculation

How much plastering can be done in a day?

 Wall Area Wall height (noted for Scaffolding preparations) Window, door jambs and beam soffit Labour Required 100 sqft <10ft nil 1 mason, 1 helper 100 sqft <10ft Yes 1.25 mason, 1.25 helper 100 sqft 10ft Yes 1 mason, 1 helper 100 sqft 10ft – 12ft nil 1.5 mason, 1.5 helper 100 sqft 10ft – 12ft Yes 1.5 mason, 1.5 helper

The above data his prepared for average labour used at more than 10 construction sites. Try to prepare your own labour usage

Also read: Labour management in construction

From the above table, (10sqm – 107.6sqft)

We will take a 10 ft wall with no walls and door jambs so we need 1 mason and 1 helper.

Step 3: Other Expenses

1.  Power + Water Consumption – 1.5%

2.  Charges for Supervision – 5%

3.  Scaffoldings/Equipment and Tools – 2%

4.  Incidental expense – 2%

5.  Contractor profit – 20%

Above percentage, his prepared for average labour used more than 10 construction sites.

Have a look at What is the cost of Cement Plastering per sqft, sqm, cft and cum?

Rate Analysis of Plaster Using Excel Sheet

 Wall Plastering Rate Analysis Area = 10 sqm Mix ratio = 1:6 Thickness = 15mm - 0.015m SNo. Description Qty Unit Rate Cost Materials 1 Cement 1 bags 400 400 2 Sand 6.09 cft 60 365.4 Labours 3 Mason 1 nos 1000 1000 4 Helper 1 nos 850 850 Materials + Labout Cost 2615.4 Other Expenses 5 Power + Water Consumption 1.50% 39.231 6 Charges for Supervision 5% 130.77 7 Scaffoldings/Equipment and Tools 2% 52.308 8 Incidental expense 2% 52.308 9 Contractor profit 20% 523.08 Cost of 10.00 Sq.m. 3413.097 Cost of 1.00 Sq.m. 341.3097 Cost of 100.00 Sq.m. 34130.97

Also Use: Plastering Calculator | Calculation of Materials For Plastering | SQFT | SQM

FAQ

What are the Specifications Used for Plastering Work in different countries?

Here are the lists of plastering work specifications as per the Indian standards, British, American, and New Zealand Standards

Indian Standard (BIS codes):

IS 8112 Specification for 43 grade OPC

IS 269 Specification for 33 grade OPC

IS 1489 Specification for Portland Pozzolana Cement

IS 383 Specification for coarse and fine aggregates for natural sources for concrete.

IS 1542 Specifications for sand for plaster

IS 2645 Specifications for integral cement waterproofing compound

British Standards:

BS EN 998-1:2016

This standard BS EN 998-1:2016 Specification for mortar for masonry is classified in these ICS categories: 91.100.10 Cement. Gypsum. Lime. Mortar

American Standards:

ASTM C 926 - Standard Specification for Application of Portland Cement-Based Plaster

New Zealand Standards:

NZS 4251.1:2007 - Solid plastering - Cement plasters for walls, ceilings and soffits

The material used for plastering work should be tested as per specification.

What are the points to be considered while Plastering work Rate analysis?

1.  Manpower wages + including their transportation

2.  Labour Output per day

3.  Material Required + wastage

4.  Power + Water Consumption

5.  Charges for Supervision

6.  Scaffoldings/Equipment and Tools

7.  Incidental expense

8.  Contractor profit

What are the sequences of work to be done before starting the plastering work?

Before starting interior plastering work, interior brickwork should be completed. In external plastering work, you should first complete the perimeter brickwork of each floor. Exterior plastering work is always started from the top of the building and finished at the bottom, and ceiling plastering should be completed before wall plastering begins.