Construction services

Insulation and drainage of basement walls – Expanded clay

Insulation and drainage of basement walls – On the bottom and wall of the foundation pit, a geotextile is laid with a reserve (separation insulation separating the ground from the expanded clay aggregate). The first layer of backfill is approx 5-10 cm keramzytu, on which the drainage pipe is clamped. This pipe should lead to the absorption well, drainage ditch etc.. in order to drain the drained water.

On foundation walls (basement) vertical damp insulation should be made below the ground level. The trench above the drainage can also be covered with expanded clay, which allows to reduce the pressure of the backfill soil on external walls. LECA is covered with mechanically compacted layers of thickness 30-40 cm. After filling the excavation, the expanded clay should be covered from the top with the remaining geotextile reserve. At the ground level, it is recommended to lay a sand bed and make a concrete band around the building. The band should be slightly wider than the filling of the expanded clay pits, yes, that rainwater does not penetrate directly into the expanded clay.

This solution has two functions – it warms the basement walls and drains the ground adjacent to the building, directing the water directly to the drain. Separation layer made of geotextile prevents siltation of the expanded clay, maintaining drainage in constant efficiency.