Rate analysis of Plaster used of reference book IS Code 1200 part 12 (IS Code 1200 part 12 used for measurement), and CPWD Part 1. All calculations of Plaster for rate analysis. This calculation calculates of cement, sand (Plaster = Cement + Sand mixture this call mortar) for materials.
Plaster is used a sum different proportions 1:3, 1:4, 1:5, 1:6, 1:8 etc.(1 cement: 4 Sand). This quantity estimation of the Plaster is required for the rate analysis.
Important Point in Rate Analysis of Plaster
Measurement of Plaster:
In booking of dimensions, the order shall be consistent and generally in the sequence of length, breadth or width and height or depth or thickness.
Dimensions
All work shall be measured net as executed in the decimal system, as given below:
- Dimensions shall be measured to the nearest 0.01 m, and
- Areas shall be worked out to the nearest 0.01 m2
Deductions of Plaster:
For jambs, soffits, sills, etc; for openings not exceeding 0.5 m2 each in area, for ends of joists, beams, posts, girders, steps, etc., not exceeding 0.5 m2 each in area, and for openings exceeding 0.5 m2 and not exceeding 3 m2 in each area, deductions and additions shall be made in the following manner:
No deduction shall be made for ends of joists, beams, posts, etc., and openings not exceeding 0.5 m2 each, and no addition shall be made for reveals, jambs, soffits, sills, etc., of these openings nor for a finish to plaster around ends of joists, beams, posts, etc.
Deductions for openings exceeding 0.5 m2 but not exceeding 3 m2 each shall be made as follows and no addition shall be made for reveals, jambs, soffits, sills, etc., of these openings: When both faces of the wall are plastered with the same plaster, deduction shall be made for one look only.
When two faces of wall are plastered with different types of plaster or if one face is plastered and the other pointed, deduction shall be made from the plaster or pointing on the side on which width of reveals is less than that on the other side, but no deduction shall be made on the other side.
Where widths of reveals on both faces of wall are equal, deduction of 50%(percent) of the area of opening on each face shall be made from areas of plaster and/or pointing as the case may be.
When only one face is plastered and the other face is not, full deduction shall be made from plaster if the width of reveal on the plastered side is less than that on unplastered side hut if widths of reveal on both sides are equal or width of reveal on the plastered side is more, no deduction shall be made.
When the width of the door frame is equal to the thickness of the wall or is projecting beyond the thickness of the wall, a full deduction for opening shall be made from each plastered face of the wall. In case of openings of the area above 3 m2 each, deduction shall be made for opening on each face but jambs., soffits, and sills shall be measured.
NOTE -In calculating areas of openings, the extra width of rebated reveals, if any shall be excluded.
Rate Analysis of Plaster.
Example for Rate Analysis of Plaster
| Plaster Rate Analysis | |||||
| 12 mm cement plaster 1 : 4 (1 cement : 4 fine sand). | |||||
| Sr No. | Description | Qty | Unit | Rate | Cost |
| Details of cost for 100.00 sq.m. | |||||
| A | Labour Charges | ||||
| 1 | Mate | 8.1 | Day | 500.00 | 4050.00 |
| 2 | Mason | 8.1 | Day | 700.00 | 5670.00 |
| 3 | Helper | 8.1 | Day | 400.00 | 3240.00 |
| 4 | Bhisti | 2.70 | Day | 400.00 | 1080.00 |
| 5 | Coolie | 8.10 | Day | 400.00 | 3240.00 |
| B | Material | ||||
| Cement | 10.51 | Bag | 320.00 | 3363.20 | |
| Wastage of Material 2% | 2% | 67.26 | |||
| Sand | 1.46 | Cu.m. | 1320.00 | 1927.20 | |
| Wastage of Material 7% | 7% | 134.90 | |||
| D | Scaffolding 1% Extra | 1% | 53.58 | ||
| E | Transportation Cost 1% | 1% | 53.58 | ||
| F | Other Charges 2 % Extra | 2% | 452.72 | ||
| G | Add for Water Charge @ 1% on Items Marked | 1% | 226.38 | ||
| H | Add for Contractor’s Profit @15% on Items Marked | 15% | 3395.65 | ||
| Cost of 100.00 Sq.m. | 22904.50 | ||||
| Cost of Sq.m. | 229.05 | ||||
| Round off Sq.m. | 229.05 | ||||
Calculation of Plaster for Rate Analysis of Plaster
In this Rate Analysis of Plaster calculation of material, labor, wastage, and other charges in rate analysis.
Material Calculation for Rate Analysis of Plaster
Material calculation in Rate Analysis like Cement, and sand
Cement calculation
Dry Cement mortar volume = 1.25 convert Wet cement.(The Plaster mortar dry volume of plaster decrease volume of dry cement mortar, so 1.25 time of dry mortar)
Wastage of cement mortar 22 % (1.25) extra
So, Cement calculation requirement of cement = 1 x 1.25 x 1.22 = 1.52 cu.m,
Multiplay plaster thickmess = 1.52 x 0.012 (thick Plaster)
= 0.01824 Cu.m
Herer calculation mortar ratio 1:4
The required amount of Cement quantity at mortar = 0.01824 Cu.m. x (1/(1+4))
= 0.01824 x 0.2
= 0.003648 cu.m. cement requirement
Cement in k.g. = volume x density cement
Cement in k.g. = 0.003648 cu.m. x 1440 (1440 kg/m Density of cement for 50 k.g)
= 0.003648 x 1440 = 5.25312 kg of cement of bag requied ment of cement in k.g.
= 5.25312 / 50 (one cemnent bag weight 50 k.g. only) = 0.1051296 bag
So, 100 sq.m. mortar requirement of cement = 0.1051296 bag x 100 sq.m. = 10.51 bag
Sand calculation
Required amount of Sand = 0.01824 Cu.m. x (4/(1+4))
= 0.014592 Cu.m. requierd of sand for 1 Cu.m.
So,
So, 100 sq.m. mortar requirement of sand = 0.014592 Cu.m. x 100 sq.m. = 1.45 cu.m.
Labour for Rate Analysis of Plaster
As per calculation of rate analysis in labor consumption per Cu.m. requirement as per our experience or CPWD book, this book public by Central Public Works Department, Government of India for easy calculation of the rate analysis, etc.
As CPWD Mate per cu.m. 0.81 of day bhisti, per cu.m.0.27-day coolie, per cu.m. 0.81-day belder, per cu.m. 0.81-day mason, per cu.m. 0.81-day helper, per cu.m. 0.81-day mate for water curing
Extra Work Calculation in Rate Analysis of plaster
Extra Changes in rate analysis as per below
Scaffolding 1% Extra
Transportation Cost 1%
Other Charges 2 % Extra (Electrical, and site extra expense)
Add for Water Charge @ 1% on Items Marked
Add for Contractor’s Profit @15% on Items Marked
FAQ: Rate Analysis of Plaster
What Is Rate Analysis of Plaster?
Rate analysis of plaster is a detailed process of calculating the cost involved in applying plaster to surfaces. It includes determining the quantities of materials needed, labor charges, wastage, and other expenses based on standards set by codes like IS Code 1200 Part 12 and specifications from the Central Public Works Department (CPWD).
How Is Plaster Measured for Rate Analysis?
Plaster is measured based on its net executed dimensions. The sequence generally follows length, breadth, and thickness. All dimensions are measured to the nearest 0.01 m, and areas are calculated to the nearest 0.01 m². Deductions are made for openings exceeding 0.5 m² as specified in the measurement guidelines.
What Types of Proportions Are Used in Plaster Mixtures?
Plaster mixtures are typically prepared in various proportions, such as 1:3, 1:4, 1:5, 1:6, and 1:8. The proportion indicates the ratio of cement to sand, with common mixes being 1 part cement to 4 parts sand for standard plastering.
How Is Cement Quantity Calculated in Plastering Rate Analysis?
To calculate the quantity of cement needed:
- Determine the dry volume of the plaster mortar by multiplying the wet volume by a factor of 1.25.
- Account for wastage, usually around 22%.
- Calculate the volume of cement required by applying the mortar ratio.
- Convert the volume into weight using the density of cement.
How Do You Calculate the Amount of Sand Required?
The quantity of sand is calculated by determining the dry volume of mortar and then applying the proportion of sand to cement. For a given volume of plaster, use the ratio of sand to cement to find the amount needed.
What Are the Labor Charges Considered in the Rate Analysis?a
Labor charges include costs for various workers such as mates, masons, helpers, bhistis (water carriers), and coolies. The charges are based on the number of days required to complete plastering over a specified area.
What Are the Common Extra Charges in Plaster Rate Analysis?
Common extra charges include:
- Scaffolding (usually 1% of the total cost)
- Transportation (typically 1%)
- Other charges (such as site-specific expenses, generally 2%)
- Water charges (1% of the marked items)
- Contractor’s profit (usually 15% of the total cost)
How Is Wastage Factored into the Rate Analysis?
Wastage is considered for both cement and sand. Typically, wastage for cement is around 2%, and for sand, it can be up to 7%. These percentages are added to the calculated quantities to ensure sufficient material is available.
How Do You Account for Openings and Deductions in Plaster Rate Analysis?
Deductions are made for openings in plastered areas based on their size. Openings larger than 0.5 m² but less than 3 m² require specific deductions, while smaller openings may not be deducted. If both sides of a wall are plastered, deductions are adjusted based on the reveal widths.
Why Is It Important to Use Is Code 1200 Part 12 and Cpwd Specifications?
IS C.ode 1200 Part 12 and CPWD specifications provide standardized methods and guidelines for measurement and rate analysis. Following these codes ensures consistency, accuracy, and compliance with industry standards in the calculation of plastering costs.
