How to choose a foundation for a house from foam block
Foam block is a light material, so for such houses you can build on the most simple foundations: strip and columnar. The level of deepening of the bottom of the base depends on how close to the surface of the earth the groundwater lies and freezes through the soil. If the TBC (soil freezing point) is below 1 m, and the GWL (groundwater level) is high, then during freezing and thawing of the soil it will exert considerable pressure on the foundation. Therefore, regardless of the type of base chosen, it will need to be buried below the TPG by 20-30 cm.
The simplest solution for a foam block house in regions with a warm climate and provided a stable soil is a columnar foundation. The supports can be built from finished factory products (reinforced concrete pillars or piles) or cast independently using asbestos-cement pipes as a formwork.Pillar foundations can also be prefabricated: built from foundation building blocks (FBS). But this type of foundation will be more expensive, as for the installation of reinforced concrete stones will need to attract lifting construction equipment.
Another type of foundation that is suitable for the house of foam blocks - columnar with grillage. It is a reinforced column base, the supports of which are connected by a concrete band. This foundation is chosen in terms of rolling ground, and it is very convenient for those developers who wish to make a basement room with a separate entrance from the street.
If the terrain of the site is complex, with significant differences in height, the optimal choice is the foundation on screw piles. Such a foundation is also suitable for areas with swampy soil. Screw piles mounted by means of a hole. The supports are buried below the TPG, so the heaving forces will not have a negative effect on the foundation. Before installation, screw piles must be further treated with anti-corrosion compounds.
For the house of foam blocks is very important high-quality waterproofing.Therefore, any foundation of the building should repel moisture and prevent it from the walls. If the strip foundation is poured, its surface is covered with roofing felt; it is better to treat the pillars with bitumen or mastics. The same applies to reinforced concrete slabs. This type of foundation is chosen in the most difficult conditions, when only a “floating” monolith can provide immobility to the base: if the ground is unstable, the groundwater level is high and the THG is lower than 1.5 m.
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