What is Plastering?
Plastering is done to cover the rough surface and the uneven surface of the wall or concrete structure with the help of mortar (A mixture of cement and sand) to make it regular, smooth clean, and durable by protecting from fire, heat, etc. Rate analysis for plaster work is done to calculate the actual cost required for completing work.
So here we will calculate the rate of plastering per unit area which is called rate analysis.
Let us start calculating with the help of a question.
Calculate the Rate analysis for plaster work 12 mm thick cement plaster on both sides of the wall (10 mx 10 m) using cement mortar (1:3).
Given:- Surface area of Wall (both side)=2×10 mx10 m (quantity of work 200 m)
Volume of work = 200 x 0.012 = 2.40 m3
Cement mortar = 1:3
Step 1:- Calculation of required materials
Volume of work = 2.40 m3
Add extra 30% to fill up joints, unevenness
quantity of mortar = 1.30 x 2.40 = 3.12 m3
Add extra 25% for voids to get dry volume of mortar
Dry volume of mortar = 1.25 X 3.12 = 3.90 m2
Add extra 5% for wastage
volume of mortar = 1.05 X 3.90 = 4.10 m3
Now, calculation of materials required in 4.10 m3 mortar
Quantity of cement = (4.10/(3+1)) x1= 1.025 m3
No.of bags = 1.025 x 28.8 = 29.52 30 Bags
Quantity of sand = (4.10/(3+1)) x3 = 3.08 m3
Step 2:- Cost of Materials
Step 3:- Cost of Labours (Let us assume work should be done in one day)
Labour Calculation for 200 m2 Plaster work
Head mason required for 1/2 for 10 m2
So, for 200 m2 = 1/(200×10) x 200 = 10 Nos.
Mason required 1 for 10 m2
So, for 200 m2 = 1/100 x 200 = 20 Nos.
Mazdoor required 2 for 10 m2
So, for 200 m2 = 2/10 x 200 = 40 Nos.
Coolie/Woman Mazdoor required 2 for 10 m2
So, for 200 m2 = 2/10 x 200 = 40 Nos.
Bhisti required 3/4 for 10 m2
So, for 200 m2 = 3/(4 X 10) X 200 = 15 Nos.
Step 4:
Total Cost = Cost of Materials + Cost of Labours
Total Cost = 15,388 + 44,750 = Rs.60,138
Step 5:
Add 1.5% of total cost for Water charges = 1.5% of 60,138 = Rs. 902.07
Add 10% of total cost for Contractor’s profit = 10% of 60,138 = Rs. 6,013.80
Grand Total = Total cost + water charge + contractor’s profit
Grand Total = 60138 + 902.07 +6013.80 = 67,053.87 = Say Rs.67,054.00
Hence,
The total cost required for this Plastering work is 67,054.00
Rate per m2 = (67054/200) = 335.27 = Say Rs.335
Hence, in this way, we can calculate the rate analysis for plasterwork Step by Step.
I hope this article on “Rate analysis for plaster work” remains helpful for you.
Happy Learning – Civil Concept
Rate analysis for plaster work Calculator
Contributed by,
Civil Engineer – Ranjeet Sahani
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