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Category Foundation & Concrete

Block Density

Wall Height (m)

Wall Thickness (cm)

Roof Area tributary (m²) Per 10m of wall (approx)

Snow Load (kg/m²)

Foundation Width (cm)

Wall Weight (Linear): 0 kg/m

Total Load on Soil: 0 kg/m

Pressure on Soil

0 kg/cm²

Reference Soil Limits:

Soft Clay: ~1.0 kg/cm²
Loam: ~2.0 kg/cm²
Compact Sand: ~3.0 kg/cm²

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About

Houses built with Autoclaved Aerated Concrete (AAC) are significantly lighter than traditional brick structures. Consequently, using standard heavy-duty foundation formulas often leads to over-engineering and wasted money. This tool calculates the specific linear load on the foundation strip based on the unique density of AAC blocks (D400, D500, D600).

It aggregates the Wall Weight, Roof Load, and regional Snow Load to determine if your planned foundation width is sufficient for the soil bearing capacity. This is critical for preventing settlement while avoiding the cost of a bunker-style foundation.

Formulas

The calculator sums vertical forces per linear meter of foundation:

Load_total = Mass_wall + Mass_roof + Mass_snow

Pressure on soil is calculated as:

P = Load_totalWidth_foundation

Reference Data

Block Type	Density	Typical Use	Thermal Efficiency
D300	300 kg/m³	Insulation only	Very High
D400	400 kg/m³	1-2 story load bearing	High
D500	500 kg/m³	Standard load bearing	Medium
D600	600 kg/m³	High strength needs	Low

Frequently Asked Questions

It is the ability of the soil to support weight without sinking. Soft clay might support only 1-2 kg/cm², while coarse sand or rock can support 3-6 kg/cm². If your Calculated Pressure exceeds this value, your house will sink.

AAC is rigid but brittle. It requires a very stiff foundation (usually a reinforced strip or slab) to prevent cracking. While it is light, the foundation must not flex.