AAC Blocks: Price, Bricks Sizes, Advantages & Disadvantages in Construction (2024)

By choosing eco-friendly construction materials for building your dream house, you are not just doing your bit to conserve the environment but also saving on your overall construction costs. Among the innovative construction materials used across the world, autoclaved aerated concrete blocks (AAC blocks or bricks) are considered superior to other conventional materials like burnt clay bricks that cause environmental hazards. The benefits of AAC blocks as an affordable and sustainable alternative to traditional building materials are being widely recognised in India. In this article, we explain AAC blocks and their advantages and disadvantages in house construction.

Table of Contents

AAC block full form

AAC blocks are also known as autoclaved aerated concrete blocks, which are one of the environment friendly and lightweight construction materials.

What are AAC blocks?

AAC blocks are a precast, foam concrete, sustainable construction material made from aggregates of quartz sand, calcined gypsum, lime, portland cement, water and aluminium powder. After mixing and moulding, the concrete is autoclaved under heat and pressure and it thus gains its distinctive properties. AAC bricks are in high demand, owing to their high strength, load-bearing and thermal insulation properties.

AAC block is used as a construction material for interior and exterior structures. The blocks may be coated with a stucco finish or with siding materials like veneer brick or vinyl siding.

AAC block: Features

Lightweight50% lighter than red bricks
Fire resistanceBetween two and six hours, based on the thickness
Energy efficiency25% reduction in air-conditioning costs
Thermal efficiencyThree times higher than clay bricks
Water absorptionAbout 10% of its weight
Sound insulation42 dB (approximately)
Affordable costNearly one-third of the cost of regular bricks

Also read all about 3D house in India

AAC block price: AAC blocks sizes and prices

Manufacturers of autoclaved aerated concrete produce AAC blocks ranging in varied sizes and strengths. The AAC block price for rectangular AAC bricks having size (length X height X weight) of 600mm x 200mm x 250mm can range between Rs 2,000 and Rs 3,500 per cubic meter. The AAC blocks sizes and prices differ, depending on the manufacturer.

Also read: Bamboo house design and construction ideas for sustainable living

AAC Blocks: Price, Bricks Sizes, Advantages & Disadvantages in Construction (1)

AAC blocks are available in different sizes, which include:

  • 600mm x 200mm x 50 mm
  • 600mm x 200mm x 75 mm
  • 600mm x 200mm x 100 mm
  • 600mm x 200mm x 150 mm
  • 600mm x 200mm x 200 mm
  • 600mm x 200mm x 230 mm
  • 600mm x 200mm x 250 mm
  • 600mm x 200mm x 300 mm

Also read all about the building code guidelines for residential buildings

AAC blocks arrangement

The material is available as AAC blocks and panels. These blocks are arranged in stacks in the same manner as in conventional masonry. However, a thin-layered mortar, and panels are vertically arranged. For structural purpose, grouted, reinforced cells and beams included within the section of the wall. The blocks can be arranged manually with hands. However, the placement of the AAC panels need the support of equipment like crane due to their large size.

AAC blocks shapes

  • Lintel blocks, which are also referred to as U-shaped bond beam are available in thickness of 8, 10, and 12 inches.
  • Tongue-and-groove AAC blocks or slabs are available in large sizes. These blocks are linked to adjacent units without the use of mortar at the vertical edges.
  • Cored blocks are used in building vertical reinforced grout cells.

AAC blocks advantages and disadvantages

What are the advantages of AAC blocks?

In today’s times when the world is realising the importance of environmental conservation, the construction sector has also witnessed technological advancements, including the use of innovative and sustainable construction materials. Here are some of the advantages of AAC bricks:

Better workability and faster construction

AAC blocks are about 50% lighter and 10 times larger than traditional bricks. This unique property facilitates easy installation and gives the desired flexibility that makes adjustments, cutting, shaping, etc., quite easy. AAC blocks have fewer joints and consistent dimensions, thereby, ensuring ease of laying and making the construction process faster. Lastly, the lightweight blocks are easy to transport, which helps to save on the overall logistics and shipping costs, as compared to the costs involved in the transportation of traditional bricks.


Generally, buildings are designed to handle vertical forces, such as self-weight and gravity. However, there are also horizontal forces, such as those caused by earthquakes. The AAC blocks gain a high level of strength during the manufacturing process, giving durability to the finished structure. Thus, structures made with AAC bricks are capable of handling higher seismic loads, compared to structures with conventional bricks.

See also: How can home owners ensure earthquake-resistant homes?

Thermal insulation and energy-efficiency

The material contains small air pockets and hydrogen is used to foam the concrete, thus, giving it an excellent heat insulation property that allows temperatures to be warm in winters and cool in summers. Therefore, it can significantly lower your air-conditioning costs by about 25%. AAC blocks are energy-efficient across their lifecycle, as their production involves less energy consumption.


The AAC block material is non-combustible and provides fire resistance of up to six hours, depending on the block thickness and up to 1,200 degrees Celsius, compared to other building materials. Thus, it also has importance from a fire safety point of view.

Sustainable and affordable

AAC blocks are made from natural and non-toxic raw materials and their manufacturing process generates minimum waste. Some of the waste or offcuts generated can be recycled or used in aggregates. As it is made from non-biodegradable materials, it makes the building durable and stable, preventing rot or mold. Furthermore, being lightweight, energy-efficient and easy to install, AAC blocks also minimise labour costs.

High compressive strength

The average compressive strength of the AAC block is 3 to 5 N/mm2. Thus, it is much stronger and better than bricks of the same density.


AAC blocks are prepared from inorganic materials, which help in protecting the structure from pests such as termites, rodents, etc.


The lightweight and porous structure of AAC blocks enables high sound reduction. For this reason, the AAC block material is widely used in the construction of studios, hotels, hospitals, etc.


Moisture can severely damage a structure. The macro-pores inside AAC blocks ensure low absorption of water. Thus, they provide better moisture protection.

See also: A guide to waterproofing your home

When it comes to small-scale building projects, red bricks may still find their importance. However, for large-scale residential, commercial and infrastructure projects, AAC blocks provide greater benefits and play a significant role in controlling the environmental damage caused due to construction using outdated building materials.

AAC blocks disadvantages: Why is AAC block not used in foundation?

Although AAC blocks are widely used in masonry units of high-rise RCC (reinforced cement concrete) framed buildings, they can be expensive when used for small load-bearing structures. When using AAC blocks, it could be one of the disadvantages. Considering the high AAC block prices, buying a small number of blocks for such structures can cost more, as compared to ordering in bulk quantities for large projects. However, the material is lightweight and thus, contributes less to dead load and the requirement of structural steel can be minimised in RCC framed structures. Therefore, it can save on construction costs, when chosen for high-rise constructions.

Further, column foundations in RCC framed structures are designed for bearing the load of a building. In such structures, RCC foundations are arranged on which RCC columns are raised. Plinth beams are placed at the plinth level and AAC block masonry is raised on it. Thus, there is no need for AAC block masonry between the columns below the DPC level plinth beam. DPC or damp-proof course refers to material applied at the basem*nt level, for restricting moisture flow through walls and floors.

Load-bearing is used for low-rise structures. The thickness of the walls and finding the right size of AAC blocks, are crucial aspects, when it comes to load-bearing walls. Moreover, the placement of these blocks requires expertise. It is important that the walls are designed by a qualified structural engineer.

See also: Mobile tower installation rules and regulations

AAC blocks installation

The installation of AAC blocks is similar to that of the conventional concrete masonry. The placement of AAC panels require the support of a crane. Based on the type of finish, the panels can be directly adhered or attached mechanically to the surface of AAC.

AAC blocks finishes

  • AAC blocks are available in stucco-type finishes. The polymer-modified plasters seal against water entry. However, they allow moisture vapour for breathability.
  • Masonry veneers can be adhered directly to the face of a wall. They can also be built as cavity walls. Like a manufactured stone, direct-applied veneers are usually lightweight.
  • Conventional siding materials are mechanically connected to the face of a wall. Furring strips must be used in case of back ventilation of the siding material is needed.

AAC blocks: Where are they used?

AAC blocks are widely used in the construction of apartments and other types of residential properties, industrial and commercial buildings, such as hotels, offices, hospitals and schools. Owing to their excellent heat insulation capacity, AAC bricks find application in interior and exterior construction. They are ideal for high-rise structures.

See also: Everything you need to know about eco-friendly homes

AAC blocks vs red bricks

AAC blocks manufacturers are sought-after by construction companies in India, as this new-age building material scores over traditional bricks for numerous reasons.

Firstly, bricks are heavier and their use in building construction involves increased cost and wastage. Moreover, the rising price of kiln fuel can impact the overall cost. AAC blocks, on the other hand, are lightweight. The weight of AAC blocks is about 80% less than traditional red bricks and leads to a reduction in the use of cement and steel, thus, saving costs. Moreover, being environmentally friendly, AAC blocks ensure better durability and improved sound and heat insulation compared to bricks.

See also: All about GST on bricks and other building materials

AAC blocks vs CLC blocks: Which is better?

CLC (cellular lightweight concrete) blocks are produced from cellular lightweight concrete (CLC) or foam concrete. It is a lightweight concrete made by combining cement and flyash slurry with pre-formed foam. CLC blocks are comparatively cheaper than AAC blocks. However, in terms of compressive strength, AAC blocks are better than CLC blocks.

See also: All about a turnkey project

AAC blocks: Background and history

In the early 1920s, Dr Johan Axel Erikkson, along with Professor Henrik Kreuger, developed AAC blocks. After patenting the manufacturing process in 1924, AAC blocks were produced in full swing from 1929 in Sweden.

Earlier, alum shale, a naturally formed clay slate comprising pyrite, was used by scientists for the process. The carbon content in pyrite facilitated the combustion process and the release of gases. In 1972, the Swedish government highlighted the release of harmful radon emissions when alum shale underwent combustion. Owing to this, the material was banned. An alternative was required, which was a blend of lime, cement, aluminium powder, and calcined gypsum.

Presently, AAC blocks manufacturing on a wide scale as construction material, is done across countries like the United States of America, Russia, Germany and India. The popularity of AAC blocks is steadily growing in many countries in Asia, including India, owing to increasing demand for housing units and commercial spaces. However, the market for this construction material is still in its nascent stages in India.

See also: All about penthouse


Why AAC blocks get cracks?

Haphazard arrangement of the AAC blocks, shift in the beam placement, shift in the skeletal movements, because of change in water content or change in temperature, are some of the common reasons for AAC blocks developing cracks.

Do AAC blocks require plastering?

AAC blocks are wire cut and they have a plain surface. Due to this reason, plastering for internal walls is not required. Thus, wall putty and painting can be directly done. However, external plastering will be required.

Are AAC blocks good or bad?

Autoclaved aerated concrete is an innovative building material. It has unique properties that make it better than traditional bricks while giving protection to a building structure in many ways. Moreover, it is environment-friendly and saves overall construction cost. Hence, it is considered a good alternative to regular building materials like red bricks.

How do you repair a cracked AAC block wall?

One can use crack filling mortar that is specially manufactured for filling cracks on AAC block walls and plasters.

How many bricks equal to one AAC block?

One AAC block of dimension 600 x 200 x 100 mm is equivalent to six bricks.

Got any questions or point of view on our article? We would love to hear from you. Write to our Editor-in-Chief Jhumur Ghosh at jhumur.ghosh1@housing.com

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AAC Blocks: Price, Bricks Sizes, Advantages & Disadvantages in Construction (2024)


What are the disadvantages of AAC block prices? ›

Disadvantages of AAC Blocks

AAC block prices vary with the quantity you order. If you are constructing a low-rise, small building, then the overall brick prices may be high when compared to traditional bricks. These are best used in high-rise buildings. Not any mason can lay AAC blocks.

Which is cheaper AAC blocks or bricks? ›

The cost of AAC blocks is lesser in comparison because they are made from Fly Ash. These blocks are perfect for those who are environmentally conscious. Red bricks cost more because they are made from the top layer of soil.

Which AAC block size is best? ›

One AAC block of size (600 x 200 x 100 mm) is equivalent to 6 bricks. Hence it reduces 50% of joints resulting in saving of mortar up to 48%. In case of 150 mm or thicker block masonry, the mortar saving is even more due to the avoidance of vertical joint. Minimal wastage of AAC blocks.

Which is better AAC blocks or bricks? ›

Autoclaved aerated concrete blocks (AAC) are specially designed to be stronger and more hom*ogeneous, which significantly strengthens the entire structure. Red bricks are much more fragile than AAC blocks, which can lead to significant waste as well as general construction defects.

Which AAC block is best for construction? ›

Here is a list of the top 5 AAC block manufacturers in India:
  • Ecorex AAC Block.
  • Magicrete.
  • JK Lakshmi.
  • Godrej Construction.
  • Birla Aerocon.
Nov 25, 2022

What is the most cost effective brick? ›

While prices can vary, thin bricks are generally more cost-effective than traditional bricks due to less raw material usage and easier installation.

Which brick is best for house construction? ›

Five of the best brick types for home renovation and construction are burnt clay, sand lime, concrete, fly ash clay, and engineering bricks.

What is the size of an AAC block compared to a brick? ›

AAC blocks are available in 600mm/625mm (length) X 100 – 300 mm (height) x 230/240 mm (width). Bricks are available in 225 mm (length) x 115 mm (width ) X 75/70 mm (Height).

What is the most popular block size? ›

The actual dimensions of solid block sizes are shown in the following table. While the common sizes are 4", 6", 8", 10", and 12", an 8-inch solid block size and 4 inch solid block size is the most common one.

Is bigger block size better? ›

A larger block size is often beneficial for large sequential read and write workloads. A smaller block size is likely to offer better performance for small file, small random read and write, and metadata-intensive workloads.

Why do AAC blocks crack? ›

Over the next 48 hours, the majority of this free moisture is released from the AAC blocks, the blocks begin to dry which results in major shrinkage within the first 48 hours of the autoclaving. This shrinkage results in cracks.

What is the lifespan of AAC block? ›

As they are lightweight blocks they help in saving structural steel for high rise structures. Also, they conduct less heat from the environment and help in energy conservation. As per AAC-India, AAC blocks have an estimated life of almost 100 years.

What are the cons of using AAC? ›

Benefits include increased speech/vocalizations, developing more advanced communication i.e., responding to greetings and questions, use of expressive and receptive language and requesting. Disadvantages include difficulty generalizing to new settings, learning symbols and integrating AAC.

What are the disadvantages of using AAC? ›

Cons: Wide range of cost. Devices can start at a couple of hundred dollars (generally these devices are limited in the amount of messages that they are able to communicate, such as devices found at: https://www.ablenetinc.com/technology/speech-generating-devices) to thousands of dollars.

What are the limitations of AAC block? ›

AAC Block Disadvantages
  • The price per unit of AAC block is high, but the entire construction cost is low because it requires minimal cement mortar to install.
  • As AAC blocks are brittle, they require special care than red clay brick when handled and transported.
  • Using AAC alone would necessitate very thick walls.
Jan 11, 2022

How much does an AAC block cost in the US? ›

Cost of AAC Blocks

As of 2018, a basic 8 x 8 x 24 inch block of AAC costs about $2.20 to $2.50/ft2; 10 to 25 percent more than standard concrete blocks.

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