HOW TO CALCULATE THE NUMBER OF BLOCKS REQUIRED FOR WALLING
The number of blocks
required for wall can be calculated from the area of the wall which will be
constructed by the block of certain size.
The mean girth of the simple obtained as calculated
from previous post is 28.85m
The common (standard)
size of the conc. block is 150 x 230 x 450; the wall length (mean girth) of building
is multiplied by the height of the walls to find the total surface area of wall, for a wall of height
2.8m with the opening as shown in the table below
The table below
shows windows and doors schedule for doors and windows used
Schedule
for windows used
|
|||||
PORTIONS
|
WIDTH(m)
|
HEIGHT(m)
|
NUMBER(m)
|
AREA(m2)
|
|
A
|
1.50
|
1.50
|
3
|
6.75
|
|
B
|
1.50
|
1.50
|
2
|
4.50
|
|
C
|
0.7
|
0.7
|
1
|
0.49
|
|
1.00
|
1.50
|
1
|
1.50
|
||
D
|
1.50
|
1.50
|
1
|
2.25
|
|
1.00
|
1.50
|
1
|
1.50
|
||
Total Area of All
Windows
|
16.99
|
||||
Schedule
for doors used
|
|||||
PORTIONS
|
WIDTH(m)
|
HEIGHT(m)
|
NUMBER(m)
|
AREA(m2)
|
|
A
|
0.90
|
2.40
|
1
|
2.16
|
|
B
|
0.9
|
2.1
|
1
|
1.89
|
|
C
|
0.8
|
2.1
|
2
|
1.68
|
|
D
|
0.9
|
2.1
|
1
|
1.89
|
|
Total Area of All
Doors
|
7.62
|
||||
Total Area of
Openings
|
24.61
|
||||
The openings to be
subtracted include windows, doors and other openings.
Net area = Total area - Openings
Total area = 2.8 x 28.85 Openings Area = 24.61m2
= 80.78m2 Net Area = 80.78m2– 24.61
m2
=56.17
m2
The number of blocks for construction of
wall can be calculated by dividing netwall area by block area
The area of block is
calculated by addition of thickness of mortar to the dimension of block
For the mortar
thickness of 10mm, new dimension of block becomes 10+230 and 10+450
The area of the block becomes
A = 0.24m x 0.46m
A = 1104m2
Number
of blocks = 56.17/0.1104
The number of blocks required is 508.786 ≈ 509 blocks
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