AAC blocks stands for Autoclaved Aerated Concrete. AAC blocks are lightweight, precast, foam-concrete (light weight, low density) building material used for making ‘blocks’ that are a substitute of the traditional red bricks.

Home buyers must keep themselves abreast of the latest trends and technologies, especially key construction materials like AAC (Aerocon) blocks. Knowledge of ‘what goes in’ our home matters, and we must know it! New home buyers scouting for new apartments or houses must be equipped to ask the right and important questions to the builders. For this, a good understanding of construction materials, and the awareness about the ‘grade and quality’ of all the specifications listed comes handy. Home buyers need to be aware and vigilant while making the final long-term decision of buying a dwelling unit.

With this background, let’s unravel the world of a key ingredient used in construction- the AAC (Aerocon) Blocks!

  • ‘Branded’ AAC blocks are costlier than the non-branded ones, but builders committed to delivering lasting value to customers use ‘branded upmarket products’ without a second thought!
  • Branded AAC blocks optimize a long lasting customer experience in many ways. Banded AAC block manufacturers, like Birla Aerocon, Siporex, Biltech, JK Lakshmi, Magicrete among others, offer a truly high-grade product-line in this category.
  • Branded AAC blocks give you a ‘robust build’ and a ‘comfortable living experience’ for decades to come. 

A comparison between ‘AAC blocks’ and conventional ‘red bricks’ given below shall give us a good frame-of-reference for a better understanding:

S. No. AAC Blocks Red Bricks
1. Constituents of AAC blocks are cement, fly ash, lime, water- inorganic materials that even help avoid termite and damages Red bricks are of many types, but are largely made-up of Silica, Alumina, Lime, Iron oxide, Magnesia
2. AAC blocks are 8 times bigger than red brick, yet easy to handle, lesser number of joints making structure sturdy Red bricks are smaller with heavier ‘dead load’ on the building structure
3. AAC blocks are lighter in weight resulting in upto 30% less load on foundation; AAC blocks are damage-resistant, esp. during earthquake Bricks are heavier in weight, and much exert a much greater load on structure; Not earthquake friendly
4. AAC blocks are environment friendly, involving less wastage of material during manufacturing process Not ecofriendly, more wastage while making red bricks including water wastage
5. AAC blocks are generally stronger than bricks ; can be used for both load bearing and non-load bearing walls or partitions, and are easy to transport Red bricks being heavy and relatively uneven, are more difficult to transport
6. AAC blocks emit lesser heat into atmosphere as lesser cement, steel and concrete is used Red bricks emit much more heat
7. AAC blocks have sound insulating properties which allow ambient temperatures to remain the same within the structures. Result– pleasant & healthy temperature for human habitat Red bricks are low in thermal & sound insulation, causing temperature and sound fluctuations. Result– comparatively unhealthy for human habitat
8. Fewer steps required while using AAC blocks in building the structure, both external & internal Many more steps involved before red bricks can be used like mixing of sand, and the laborious process of preparing cement to fix the bricks, and curing process at a later stage
9. AAC blocks can be used for both external and internal walls; Particularly suitable for non-load bearing partition walls Bricks are good for bridges, foundations, arches, buildings, pavements
10. They increase the carpet area for you within the structure Reduced carpet area with red bricks
11. AAC blocks reduce cost of air-conditioning; Help save electricity cost for cooling and heating of home Red bricks increase cost owing to higher consumption of electricity while both cooling and heating the home
12. AAC blocks save water, as water curing is not required High dependency on water resulting in water wastage since the structure depends on water curing as well


All these reasons and benefits make branded AAC (Aerocon) blocks a preferred option by the reputed builders across the country!

How to optimize use of AAC blocks- a few guidelines

Certain guidelines have to be followed by the builders while deploying AAC blocks to ensure that there are minimal breakages and wastages. Professional builders normally deploy Civil Engineers to effectively supervise adherence to these below-mentioned guidelines to optimize the benefits accrued.

By knowing these guidelines and technicalities, a home buyer also gains a better understanding of the AAC blocks. 


Stacking of the blocks should be done on an evenly laid out surface. Undulations on the surface might cause the lower blocks to crack or break.


Mortar mixing: 

Ready-made jointing chemicals with 3 to 4 mm thickness or with conventional cement mortar (1:6) should be mixed.


Wetting of blocks:

This is a very crucial step, and unless supervised, many masons miss out on this step. Masons must wet all the blocks with water before starting the application process. 


Thickness of Mortar: 

Mortar is the workable paste that dries-up and binds the AAC blocks. Depending on the AAC blocks being used, keep the thickness of mortar limited to 10 to 12 mm with regular cement mortar, and 3 to 4 mm with ready-made jointing mortar.


Coping beam or bond beam: 

It is recommended to apply a coping beam (Bond beam) with 2 nos. of 8 mm bia. reinforcement after 1.2 mts height.


Curing of masonry wall:

Curing is necessary only for cement mortar joint, and is not required for ready-made mortar jointing.


Cutting of blocks: 

Use tools like a hacksaw or rotary cutter or hand wood saw. One must ensure that the block has to be completely dry when cutting, since wet block resist easy cutting.

Knowing these technical details prepare a home buyer to ask the right questions, and make an informed decision while choosing a home!

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