Walls are one of the largest material costs in a building. In most Indian cities builders now choose between traditional red clay bricks and autoclaved aerated concrete (AAC) blocks. Both can produce good buildings; the right choice depends on the structure, climate, budget and the skill of the masons.
1. What they are
Red bricks are made by firing clay in kilns. AAC blocks are factory-made from cement, lime, fly ash or sand and an aerating agent, then cured under steam pressure, which creates millions of small air pockets. That makes AAC blocks much lighter than solid clay bricks of the same volume.
2. Key differences
- Weight: AAC is lighter, which reduces dead load on beams, columns and foundations in framed buildings
- Size: AAC blocks are larger, so fewer joints and faster laying
- Insulation: AAC generally offers better thermal insulation, useful in hot Rajasthan summers
- Strength: good red bricks have higher compressive strength per unit; both are adequate as infill in RCC frames when used correctly
- Water absorption and finishing: each needs the right mortar or adhesive and plaster practice
3. Where each fits
For RCC framed buildings such as apartments, offices and commercial buildings, AAC is often preferred for infill walls because of lower dead load and speed. For load-bearing houses, boundary walls and areas with regular moisture, well-burnt bricks remain common. See our boundary wall guide for compound walls.
4. Quality checks on site
- Check the supplier’s test certificates against the relevant BIS standard
- Look for uniform size, sharp edges and no cracks
- Use the mortar or block adhesive recommended by the manufacturer
- Provide RCC bands, lintels and proper curing; see our curing guide
- Avoid fixing heavy loads into AAC without suitable anchors
5. Cost and procurement
Compare the total wall cost, not only the price per unit: mortar, labour, plaster thickness, speed and structural savings all matter. Procurement tips are in the group’s construction material procurement guide, and ATTPL Infra supports material planning and construction. For a discussion about your requirement, contact ATTPL HOLDCO or call toll-free 1800-890-0815.
Frequently asked questions
Are AAC blocks strong enough for houses?
They are widely used as infill walls in framed buildings. For load-bearing walls, follow a structural engineer’s design.
Do AAC walls crack more?
Cracks usually come from poor joints, missing bands or inadequate curing and plaster practice, not the material alone.
Which is cheaper?
It depends on local prices. Compare total wall cost including mortar, labour, speed and structural savings.
Sources
This article is general information, not professional advice. Rules, rates and schemes change; please check the official sources and consult a qualified professional.
