We have already discussed the importance of rate analysis. and how it will help us to face everyday scenarios.
Estimation of Material Quantity
Assume that we are going to analysis the rate for 1 m^{3} of Brickwork (B.W)
STEP 1 – Volume of single brick without mortar
Volume of 1 brick without mortar = 0.19 x 0.09 x 0.09 = 0.0015 m^{3}
STEP 2 – Volume of single brick with mortar
While brickwork construction we will add cement mortar around 3 sides (left, right & top).
So adding 10mm thick on each side of brick as mortar thickness
The volume of brick with mortar = (0.19+0.010) x (0.09+0.010) x (0.09+0.010) = 0.20 x 0.1 x 0.1 = 0.002 m^{3}
The volume of 1 brick with mortar = 0.002 m^{3}
STEP 3 – Number of bricks for 1 m3 Brickwork
Number of bricks with mortar for 1 m3 = 1 cubic meter / volume of bricks with mortar = (1/0.002)= 500 Nos
So the required number of bricks for 1 m^{3} = 500 Nos
STEP 4 – Cement Mortar Volume for 1m3 of Brickwork
Cement Mortar Volume = Volume of brickwork with mortar – the volume of bricks without mortar
Volume of bricks with mortar in 1 m^{3} = 500 x 0.002 = 1 m^{3}
Volume of bricks without mortar in 1 m^{3} = 500 x 0.001539 = 0. 7695 m^{3}
Therefore required cement mortar = 1 m^{3} – 0.7695 m^{3} = 0.2305 m^{3}
Step 5 – Calculate Cement & Sand Volume
As we know the required cement mortar = 0.2305 m^{3}
Assuming cement mortar ratio as 1:5 (1 Part Cement : 5 Part Sand)
We have already discussed the cement mortar volume calculation in plastering work post.
The above formula will give a dry volume of cement mortar, So to get wet concrete volume, we have to multiply the dry volume by 1.33
Total Parts = 1+5 =6
Required Volume of Cement = 1/6 x 1.33 x Mortar Volume = 1/6 x 1.33 x 0.2305= 0.0511 m^{3}
To convert into cement bags – (0.0511 x 1440)/50 = 1.47 Bags or 73.58 Kg
Required Sand Volume = 5/6 x 1.33 x Mortar Volume = 5/6 x 1.33 x 0.2305 = 0.2554 m^{3}
Required Material Quantity
Materials required for 1 m3 Brickwork is
- 500 Numbers of bricks
- 73.58 Kg or 1.47 Bags of cement
- 0.2554 m^{3 }of sand
Labour Estimation
From our thumb rule estimation (Labour Output Per Day), we are calculating the labour estimation as follow,
- Mason / Brick Layer – 0.4
- Male Coolie – 0.5
- Female Coolie – 0.5
- Waterman – 0.2
Description | Unit | Qty | Rate | Amount |
Analysis of the rate for 1 m^{3} of Brick Work (B.W) in Cement Mortar 1:5 (1 Cement: 5 coarse sand) using common burnt clay bricks of class designation 75, including curing, etc. | ||||
Materials | ||||
Cement | Bags | 1.47 | 350 | 514.5 |
Sand | m^{3} | 0.2554 | 1800 | 459.72 |
Bricks including wastage | Nos | 500 | 7 | 3500 |
Manpower | ||||
Mason | Each | 0.4 | 700 | 280 |
Male Mazdoor | Each | 0.5 | 500 | 250 |
Female Mazdoor | Each | 0.5 | 400 | 200 |
Waterman | Each | 0.2 | 400 | 80 |
Subtotal | 5284 | |||
Tools & Tackles | 1% | 53 | ||
Add for Sundries & Contingencies | 3% | 158.5 | ||
Add for Overhead & Contractor profit | 10% | 528 | ||
Total | 6023.5 | |||
Rate per m^{3} | 6023.5 |
You may download the Excel Sheet of Rate Analysis: Rate Analysis Sheet