Red Brick vs Fly-Ash Brick vs AAC Block — Which Is Best for Your Building in 2025?”
Quick ;
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If you want lowest upfront material price but slower work & more plaster: Red clay bricks. (Good traditional choice.)
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If you want eco-friendly, stronger bricks at slightly higher consistency: Fly-ash bricks — good balance of cost, strength and environmental benefit.
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If you want fastest construction, best thermal insulation and less plastering, with lower overall wall cost (labour+materials): AAC blocks.
Key standards/specs differ between them (see details & sources below).
1) Short specification snapshot (what matters)
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Red / Common Burnt Clay Bricks
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Sizes: common modular ~190×90×90 mm or non-modular sizes per IS.
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Strength (classified by “class”): typically 3.5 N/mm² up to 10–15 N/mm² depending on class/manufacture; use IS 1077 for exact limits.
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Water absorption, hardness and shape vary a lot (quality depends on burning).
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Typical use: load-bearing walls, general masonry (when certified).
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Fly-ash (Pulverized Fly Ash) Bricks
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Sizes similar to clay bricks (e.g., 230×110×70 mm common).
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Compressive strength: typically higher & more consistent than common clay bricks — many fly-ash bricks are manufactured to meet IS 12894 (strengths commonly 7–12 N/mm² and up depending on product).
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Lower porosity → better uniformity, fewer cracks; manufactured by compression + curing.
