Aerated Concrete Homes Face Rapid Decay Due to Common Construction Errors, Expert Warns
STERLEGRAD, RUSSIA - A popular building material for country homes, aerated concrete, is vulnerable to surprisingly rapid deterioration if key construction principles are ignored, according to construction expert Alexei Kovalev. He cautions that seemingly convenient finishing choices can “lock” moisture inside the structures,leading to significant damage within just a few seasons.
Aerated concrete’s appeal lies in its lightweight nature,environmental friendliness,good insulation,and relative affordability. Though, its high porosity – its ability to readily absorb moisture - presents a critical challenge. Kovalev explains that applying dense finishing materials,such as extruded polystyrene foam externally or cement screeds and tiles internally,prevents the material from “breathing.”
“Moisture cannot come out, and as a result, condensate is formed in the thickness of aerated concrete blocks,” Kovalev stated. “The walls remain constantly wet, which creates ideal conditions for the advancement of fungus and mold. A few years later, this can lead to the loss of thermal insulation and the gradual destruction of the material.”
The expert highlights two primary mistakes: using impermeable exterior finishes and applying standard, dense interior renovation techniques like tiling over screeds and plaster. In both cases, trapped moisture doesn’t evaporate and rather actively degrades the aerated concrete from within.
Kovalev recommends utilizing vapor-permeable plasters and light decorative coatings,alongside effective ventilation systems,to allow moisture to escape. Correctly selected hydrophobizing agents are also crucial – they should prevent water absorption while still allowing steam to pass through.
“If you have already decided to build a house from aerated concrete, be prepared for the fact that the material requires an attentive approach,” Kovalev warns. “You cannot save on design, ventilation and choice of finishing materials. Otherwise, the dream of your own house can turn into an expensive catastrophe.”
