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Estimating Concrete Hollow Block Quantity

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”.



HOW TO ESTIMATE THE QUANTITY OF CHB FOR YOUR CONCRETE WALL:

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.

1m2 / 0.08m2 = 12.5 pcs of CHB

  1. Determine your initial wall area:

  2. Determine the area of your wall. The formula for a square wall is Length * Height.

    Square Wall Area = 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.


  3. Determine door and window areas:

  4. Determine if there are any openings in your wall – e.g. windows or doors. If there are, get the total area of the openings.


  5. Get your total wall area:

  6. Subtract your total openings with the initial area of your wall.

    Total Wall Area = Initial Wall Area – Total Wall Opening Area


  7. Multiply your total wall area by 12.5, the number of pieces needed for a 1m2 wall:

  8. No. of CHB = Total Wall Area * 12.5

SAMPLE PROBLEM 1


Compute for the quantity of 4” concrete hollow blocks (CHB) needed for a wall that is 3 meters high and 2 meters long.


SOLUTION

  1. Determine your initial wall area:

  2. Square Wall Area = Length * Height
    = 2m * 3m
    = 6m2


  3. Determine door and window areas:

  4. There are no specified doors or windows.


  5. Get your total wall area:

  6. Total Wall Area = Initial Wall Area – Total Wall Opening Area
    = 6m2 – 0m2
    = 6m2


  7. 4. Divide your total wall area by 12.5, the number of pieces needed for a 1m2 wall:

  8. No. of CHB = 6m2 * 12.5
    = 75 pcs. of CHB




SAMPLE PROBLEM 2


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.


SOLUTION

  1. Determine your initial wall area:

  2. Square Wall Area = Length * Height
    = 5m * 3m
    = 15m2


  3. Determine door and window areas:

  4. Door Area = 2.1m * 0.6m
    = 1.26m2

    Window Area = 1m * 0.6m
    = 0.6m2

    Total Opening Area = 1.26m2 + 0.6m2
    = 1.86m2

  5. Get your total wall area:

  6. Total Wall Area = Initial Wall Area – Total Wall Opening Area
    = 15m2 – 1.86m2
    = 13.14m2


  7. Divide your total wall area by 12.5, the number of pieces needed for a 1m2 wall:

  8. No. of CHB = 13.14m2 * 12.5
    = 164.25 pcs of CHB
    ~ 165 pcs. of CHB



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VERIA
Construction Encyclopedia
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