Now, let us calculate the interior plastering cost of one room of a building as shown below.
Given data:
Width of the room = 14ft.
Length of the room = 16ft.
Height of the room = 10 ft.
One door of size = 2.5ft × 7.0 ft.
One window of size = 3ft × 4ft.
Area of a wall to be plastered
= [{(2nos × area of front & back wall) + (2nos × area of sidewalls)} - {(door size) +( window size)}]
= [{(2nos × 14ft. × 10ft.) + (2nos.× 16ft. × 10ft.)} - {(2.5ft. × 7.0ft.) +( 3ft. × 4ft.)}]
= [{(280sq ft.) + (320 sq ft.)} - {(17.5 sq ft.) +( 12 sq ft)}]
= [ { 600sq ft.} - {29.5 sq ft.}]
= 570.5 sq ft.
Area of the ceiling to be plastered
= [14ft × 16ft.]
= 224 sq ft.
The total area of plastering
= wall area +ceiling area
= 570.5 sq ft. + 224 sq ft.
= 794.5 sq ft.
Usually, the thickness of wall plaster ranges from 10mm. to 15mm. & the thickness of the ceiling plaster range is between 6mm to 10mm.
For the calculation purpose, let us consider wall plaster of a thickness of 12mm. & the ceiling plaster of 8mm. thickness.
Data considered:
Wall plaster thickness = 12mm =0.0394 ft.
Ceiling plaster thickness= 8mm = 0.0262 ft.
Let us make plaster of a 1:4 ratio.
The total volume of the plaster
= [vol. of wall plaster + vol. of ceiling plaster]
=[ (area of wall plaster × thickness) + (area of ceiling plaster × thickness)]
= [( 570.5 sq ft.× 0.0394 ft.) + ( 224 sq ft. × 0.0262 ft.)]
= [22.477 cu ft. +5.869 cu ft.]
= 28.346 cu ft.
A. Material calculation:
Read the article, Calculating the quantity of materials in 1 cum. & 1cuft. of plastering mortar in different mix ratios.
Cement bag required per cu ft of plaster mortar = 0.217 bags
The volume of sand required/cu ft. of plaster mortar = 1.064 cu ft.
Note: The quantity of cement & sand/ cu ft. is taken from the above-mentioned article.
1. No. of cement bags required
= vol. of plaster × bags/ cu ft.
= 28.346 cu ft × 0.217
= 6.15 bags.
2. The volume of sand required
= vol. of plaster × sand / cu ft.
= 28.346 cu ft. × 1.064
= 30.16 cu ft.
B. Labor calculation:
The labor rate per sq ft. of the internal plastering ranges from INR 10/- to 15/- depending upon the region.
Let us consider an average rate of INR 12/- per sq ft.
The total cost of labor for plastering
= total area of plaster in sq ft. × labor rate/ sq ft.
= 794.5sq ft. × 12/-
= INR 9,534/-
Now, let us calculate the total cost of plastering in table format.
|
Sl. no. |
Item. |
Qty. |
Rate. in INR. |
Unit. |
Cost in INR. |
|
1. |
Cement |
6.15 |
400/- |
Bags |
2460.00 |
|
2. |
Sand |
30.16 |
60/- |
Cu ft |
1809.60 |
|
3. |
Chicken mesh |
Lump-sum |
200.00 |
||
|
4. |
Miscellaneous |
Lump-sum |
150.00 |
||
|
5. |
The material cost = |
4619.60 |
|||
|
6. |
Add 5% wastage = |
230.98 |
|||
|
7. |
Total material cost = |
4850.58 |
|||
|
8. |
Labour cost = |
9534.00 |
|||
|
9. |
The total cost of plastering = |
14,384.58 |
|||
= [total plastering cost ÷ total plastered area]
= [ 14384.58 ÷ 794.5]
= INR 18.10/sq ft.
The cost of internal plaster/cu ft.
= [total plastering cost ÷ total plastered vol.]
= [14384.58 ÷ 28.346]
= INR 507.46/cu ft.
Thank you for going through this article❤. Have a good day😄.
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