Additional insulation, interior

Install stone wool insulation slabs tightly against each other on the interior side of the cellar wall. Cover the new insulation layer with bricks or building blocks. If you’re putting insulation on the inside only, plan it well as there is a risk for moisture problems. Separate any steel structure from the existing wall with a layer of stone wool board or a similar material.

Renovation, cellar wall
  • Gravel filling with good water permeability 
  • Waterproof layer
  • Frost insulation: PAROC GRS 20 or PAROC COS 10
  • Waterproof layer (e.g., a bitumen mat around the lower part of the wall).
  • Old supporting structure;: reinforced concrete or lightweight concrete block foundation
  • Thermal insulation: PAROC eXtra 
  • Brick or block wall
  • New surface material
Good waterproofing is essential. If your building has timber structures, ensure that no moisture can penetrate the structure–even periodically.

Use stone materials in basements. They have better moisture resistance than timber-based products. If you use timber-based products, they should be pressure impregnated. Always separate them from stone structures with bitumen felt strips. The internal surface of the new structure should be as airtight as possible. 

Additional insulation for basement ceilings

If the basement is converted into living space no separate insulation is normally required. Sometimes also better sound insulation may be needed. This is easiest done by installing Paroc acoustic slabs to the ceiling.