Concrete Hollow Blocks are used for a variety of purposes and are classified as load-bearing and non-load bearing blocks. Local hardware stores usually have a variety of 3 commercially-available CHBs – 4”, 6”, 8”.
The easiest way to estimate CHB quantity is by the Area Method. A piece of standard concrete hollow block (CHB) has a surface area of 0.08 m2. In accordance to this, a one square meter area will require 12.5 pcs of CHB.
Determine the area of your wall. The formula for a square wall is Length * Height.
Make sure to take into consideration the often overlooked information that will affect the area of your wall – for example, the depth of your beam or the underground foundation CHB.
Determine if there are any openings in your wall – e.g. windows or doors. If there are, get the total area of the openings.
Subtract your total openings with the initial area of your wall.
Compute for the quantity of 4” concrete hollow blocks (CHB) needed for a wall that is 3 meters high and 2 meters long.
Square Wall Area = Length * Height
= 2m * 3m
= 6m2
There are no specified doors or windows.
Total Wall Area = Initial Wall Area – Total Wall Opening Area
= 6m2 – 0m2
= 6m2
No. of CHB = 6m2 * 12.5
= 75 pcs. of CHB
Compute for the quantity of 8” concrete hollow blocks (CHB) needed for a wall that is 3 meters high and 5 meters long with a door that is 2.1 meter high and 0.6 meter wide and a window that is 0.6 meter wide and 1 meter high.
Square Wall Area = Length * Height
= 5m * 3m
= 15m2
Door Area = 2.1m * 0.6m
= 1.26m2
Window Area = 1m * 0.6m
= 0.6m2
Total Opening Area = 1.26m2 + 0.6m2
= 1.86m2
Total Wall Area = Initial Wall Area – Total Wall Opening Area
= 15m2 – 1.86m2
= 13.14m2
No. of CHB = 13.14m2 * 12.5
= 164.25 pcs of CHB
~ 165 pcs. of CHB
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