Comparison between Fly ash bricks and Clay bricks

Fly ash brick vs Clay brick

In our previous article Fly Ash Bricks, we discussed about the characteristics of fly ash bricks and its advantages. Recently one of our readers asked about the differences between fly ash bricks and clay bricks. Here we have compared both the bricks on the basis of their characteristics which will certainly help you to choose the better one.


Fly ash bricks

Clay bricks

The colour of fly ash brick is same as the manufacturing is carried out using machinery in controlled condition. Not in uniform colour as the colour of brick depends upon type of soil and quality control during production.
Uniform in shape and smooth in finish as the manufacturing is carried out using machinery. Clay bricks are uneven in shape as mostly clay bricks are made manually.
As the surface is even and joints are thinner, no plastering required in normal cases. As the surface finish is not even, plastering is necessary.
Fly ash bricks are lighter as the main composition is fly ash. Clay bricks are heavier as compared to fly ash bricks.
Fly ash bricks are less porous. Clay bricks are more porous.
The cost of fly ash brick is approximate 30% lower than clay brick. The cost of clay brick is higher than fly ash brick.
This is made by using by-product of Thermal Power Plant, which save environment from being polluted. Continuing use of clay bricks in construction industry will lead to extensive loss of fertile top soil. This could be a devastating environmental hazard.

From the above comparison it is very much clear that fly ash bricks are superior to clay bricks and one can use fly ash bricks for construction of house without any hesitation.

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  1. I wanted to start the fly ash bricks manufacturing unit please advise me the rate comparison and ingredients which are to be used please help in the regard.

  2. what about the load bearing capacity of fly ash brick when compare with clay brick?
    will water contact cause damages to the non plastered wall built with fly ash brick?

  3. @RS, I dont think any radiation due to radium / radon on Fly Ash bricks as Thermal power plants don’t use any radio active materials to burn coal. Do you have any proof to substantiate your claim?.

  4. While flyash bricks have many superior properties compared to ordinary clay bricks, one also note that Indian flyash from the Thermal Power Plant waste has been found to be radioactive due to the presence of radium and radon and can significantly increase the exposure to such radiation when used indoors (walls etc.). Therefore while thinner plaster or no plastering is an attractive proposition to save cost, one must always use proper plaster to help absorb this radiation from the ash, to prevent cancer and other diseases.

    • Seriously radium and radon? First time ever I see this information and I have been reading about fly ash bricks for past two three months as I plan to use it for my house building. As the fly ash bricks are very smooth getting any plaster on it is a challenge and people usually suggest using POP or putty directly on the brick wall. But a radiation hazard is a serious issue and body would like to build a house with such material then. How come everybody in India is using this material without putting a notification to it that it has radiation emitting materials. If lead can cause cancer then it’s any product containing lead mentions that as a warning that it has lead in it and lead free things are marketed that way. Don’t we have some authority in India which can provide such facts on a given material and publish it. Is fly ash from all around the India has such radiation emitting material or some specific region coal has this property?

  5. Thank you for sharing the valuable inputs… only point to fine tune is that fly ash bricks are 33-35% expensive thn to the clay bricks…

  6. Well said! Fly ash brick is a gift for today’s construction industry and work in a variety of ways to benefit environment and consumer.

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