The document discusses the materials and labor required to apply a 20mm thick external plaster over an area of 10 square meters. It calculates that 1.5 bags of cement and 0.15 cubic meters of sand will be needed, along with 2 masons, 1 male coolie, 1 female coolie, and 0.5 bhisties. The total material cost is estimated to be Rs. 590 and total labor cost as Rs. 2030, bringing the initial cost to Rs. 2620. Adding 1.5% for water charges and 20% contractor's profit, the final cost is calculated to be Rs. 3200, or Rs. 320 per square meter.

1. Contents
Materials required for 20mm thick external plaster
Labor required for 20mm thick external plaster
Calculations in standard table
2
1
3
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2. Materials required for 20mm thick external plaster
• Let’s assume that the plaster is in double coat, with 1st coat 12mm thick in proportion (1:4)
and 2nd coat 8mm thick in proportion (1:2).
• Assume the total quantity of plaster 10𝑚2
.
• Materials required for 1st coat (12mm thick):
𝑐𝑒𝑚𝑒𝑛𝑡: 𝑠𝑎𝑛𝑑 = 1: 4
1 + 4 = 5
𝑉𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑚𝑜𝑟𝑡𝑎𝑟 𝑟𝑒𝑞𝑢𝑖𝑟𝑒𝑑 𝑓𝑜𝑟 𝑡ℎ𝑒 1𝑠𝑡 𝑐𝑜𝑎𝑡 = 10 × 0.012 = 0.12𝑚3
𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑐𝑒𝑚𝑒𝑛𝑡 𝑟𝑒𝑞𝑢𝑖𝑟𝑒𝑑 = 1 ×
1
5
× 0.12 = 0.024𝑚3
𝑁𝑜𝑠 𝑜𝑓 𝑐𝑒𝑚𝑒𝑛𝑡 𝑏𝑎𝑔𝑠 =
0.024
0.035
= 0.68
𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑠𝑎𝑛𝑑 𝑟𝑒𝑞𝑢𝑖𝑟𝑒𝑑 = 4 ×
1
5
× 0.12 = 0.096𝑚3
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3. s
• Materials required for 2nd coat (8mm thick):
𝑐𝑒𝑚𝑒𝑛𝑡: 𝑠𝑎𝑛𝑑 = 1: 2
1 + 2 = 3
𝑉𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑚𝑜𝑟𝑡𝑎𝑟 𝑟𝑒𝑞𝑢𝑖𝑟𝑒𝑑 𝑓𝑜𝑟 𝑡ℎ𝑒 2𝑛𝑑 𝑐𝑜𝑎𝑡 = 10 × 0.008 = 0.08𝑚3
𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑐𝑒𝑚𝑒𝑛𝑡 𝑟𝑒𝑞𝑢𝑖𝑟𝑒𝑑 = 1 ×
1
3
× 0.08 = 0.027𝑚3
𝑁𝑜𝑠 𝑜𝑓 𝑐𝑒𝑚𝑒𝑛𝑡 𝑏𝑎𝑔𝑠 =
0.027
0.035
= 0.77
𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑠𝑎𝑛𝑑 𝑟𝑒𝑞𝑢𝑖𝑟𝑒𝑑 = 2 ×
1
3
× 0.08 = 0.054𝑚3
𝒕𝒐𝒕𝒂𝒍 𝒒𝒖𝒂𝒏𝒕𝒊𝒕𝒚 𝒐𝒇 𝒄𝒆𝒎𝒆𝒏𝒕 𝒓𝒆𝒒𝒖𝒊𝒓𝒆𝒅 𝒇𝒐𝒓 𝒃𝒐𝒕𝒉 𝒄𝒐𝒂𝒕𝒔 = 𝟎. 𝟔𝟖 + 𝟎. 𝟕𝟕 = 𝟏. 𝟒𝟓 ≈ 𝟏. 𝟓 𝒃𝒂𝒈𝒔
𝒗𝒐𝒍𝒖𝒎𝒆 𝒐𝒇 𝒔𝒂𝒏𝒅 𝒓𝒆𝒒𝒖𝒊𝒓𝒆𝒅 𝒇𝒐𝒓 𝒃𝒐𝒕𝒉 𝒄𝒐𝒂𝒕𝒔 = 𝟎. 𝟎𝟓𝟒 + 𝟎. 𝟎𝟗𝟔 = 𝟎. 𝟏𝟓𝒎𝟑
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4. Labor required for both coats
• The following labor is required for mixing, applying mortar on the wall,
smoothening, finishing…etc.
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Labor Number Job
Mason 2 Smoothening, finishing
Male coolie 1 Mixing mortar
Female coolie 1 Carrying mortar
Bhistie 0.5 Surface preparation and
applying mortar on wall

5. Calculation Table
Particulars Quantity/Number Rate
Rs.
Per Amount
Rs.
Materials:
Cement
Sand
Sundries
Labor:
Mason
Male coolie
Female coolie
Bhistie
Scaffolding
Sundries
1.5
0.15
2
1
1
0.5
300
800
600
300
300
300
Bag
Meter cube
Day
Day
Day
Day
Lump sum
450
120
20
---------------
590
1200
300
300
150
60
20
----------------
2030
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6. s
Final Calculations:
Material cost 590
Labor cost 2030
-----------
2620
Add 1.5% water charges and 20% contractor’s profit
Final Amnount = 1.015 × 1.2 × 2620 = 3191.16 ≈ 3200
Rate per meter square =
3200
10
= 320
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7. a
Thank You
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8. References
Websites:
• https://nptel.ac.in/
Books:
• Estimation Costing and Valuation by S C Rangwala
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