What is Difference Between AAC Blocks and Clay Bricks

Difference Between AAC Blocks Vs Red Bricks

A Comparative Analysis between Most demanding Brick  Autoclaved aerated concrete Blocks ( AAC ) and Most common Brick Red Brick ( Natural Clay Bricks), Before choosing any bricks please read these Analysts then compare with each other and choose according to this chart.

Sr. No.


Red Bricks


1 IDENTIFICATION BY COLOR You can Identify by Red in colour. AAC blocks colour is in Gray Color.
2 RAW MATERIALS FOR MAKING The main raw material for making red bricks is Natural Soil. Fly Ash is the main ingredient for making AAC blocks.
3 PRODUCT TYPE Red Brick is not a Green Product, Because Red bricks are made from the natural top layer of soil, which is a big loss of our Environmental. It also reduces the top layer of fertile soil which helps in the growing of crops. AAC Blocks is a green product Because AAC blocks are made from fly ash which is a waste product from the thermal power plant and it’s non-toxic material which is not harmful to the natural Environmental. We can recycle the waste product again and again.
4 EARTHQUAKE RESISTANCE Red Brick increases the dead load of the main structure. And it’s less stable as compared to AAC Blocks during the earthquake. AAC Blocks reduce the dead load of the main structure. And it’s more stable as compared to Red Bricks during earthquake time.
5 FIRE RESISTANCE Red Bricks is a less Fire resistance as per PCA (Portland Cement Association) AAC Blocks is more fire resistant as compared to Red bricks as per PCA (Portland Cement Association) Experimental.
6 WATER ABSORPTION Red Bricks is Absorb more water, but not more than 20 % if the brick quality is not poor. AAC Blocks is Absorb less water as compared to Red Bricks, It varies Between 5-10 %, But Not more than 10% by it’s own weight.
7 SOUND INSULATION Red Bricks not have any properties for sound Insulation. By Technically you can say 50-60db for 230mm thick wall. AAC Blocks have sound insulation properties. It acts as a Soundproof barrier. Technically we saY 40-45db for 200mm thick wall.
8 MOISTURE RESISTANCE The moisture resistance of Red brick is less as compared to AAC Blocks. AAC Blocks Moisture Resistance is better than Red Bricks.
9 Thermal Conductivity K value = 0.16 W/mk K value = 0.81 W/mk
10 DENSITY Red Bricks Density is 1600-1922 kg/Cum, It’s  Depends upon the Quality of the bricks. AAC blocks Density is varies between 450 – 950 kg/ Cum.
11 COMPRESSIVE STRENGTH Red Brick Compressive Strength is 2.5 – 3 N/mm2 ACC Blocks Compressive Strength is 3 – 5 N/mm2 (IS 2185, Part-3)
12 ECONOMICAL Using Red Bricks at the site it’s costly as compared to AAC blocks AAC Block at the construction site is cheaper.
13 SPEED OF CONSTRUCTION Comparatively lower as compared to AAC Blocks wall. Due to lots of joints, Small size, improper size and shape. Very high due to bigger size, lightweight, which results in faster construction, saving on labour and jointing mortar due to elimination of Vertical Joints.
14 MORTAR CONSUMPTION Red Brick Mortar Consumption per Cum with 1:6 Ratio, we need Approx 1.4 Bags of cement. Mortar Consumption per Cum with 1:6 Ratio, we need Approx 0.5 Bags of cement.
15 QUALITY & DURABILITY Normally varies Uniform and Finished product.
16 WATER USAGE DURING CONSTRUCTION High, Need curing before using this Red Bricks Low, needs only surface wetting before using these AAC Blocks.
17 WASTAGE DUE TO USING Approximate 8-10%. Maximum waste during construction is 1-5%.
18 PRECISION IN SIZE 5 – 10 mm ± Variation in size and shape. 1.5-2 mm ± Variation in size and shape.
19 SIZE Generally 190 mm X 90 mm X 90 mm 625/600 mm X 240/200 mm X 75-300 mm
20 LABOUR OUTPUT More due to small size, shape, lots of joints Very less as compared to Red bricks.

Now Don’t be confused when choosing good bricks, But my opinion is to go for AAC ( Autoclaved aerated concrete )Blocks.

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