Perimeter thermal insulation of basement walls below ground level

The requirements for thermal insulation and the living climate, also in basements or especially in basement living spaces, are higher than ever before. Insulation of basement rooms contributes to a pleasant and healthy living climate. Optimal thermal insulation of all basement walls on their external sides is a big issue for reducing the main causes of the earth warming up with CO2 emissions. On top, the investment in comprehensive thermal insulation measures is amortized for the building owner in the short term due to significantly lower energy consumption.

Furthermore, hard foam extruded insulation boards protect the waterproofing layers from external influences. It extends the life span of the building and increases its value. Perimeter insulation can be installed on new and also on old buildings.

Simple & safe to the goal

  1. 1. Lay the insulation boards starting at the bottom of the basement walls. Boards must stand firmly on the forepart of the concrete slab. After full drying of the previous bitumen waterproofing layers, insulation boards can be glued either dotwise in case of non-pressure water or full-surface in case of pressure water according to the floating-buttering method, i.e. the glue material is applied on the substrate and also on the backside of the boards.

  2. 2. In case of water pressure, apply the bitumen coating all around the stage rabbet of boards in order to avoid any backwards humidity penetration.


  3. 3. Whenever thermal insulation of water-impermeable concrete structures below ground level is necessary, the bonding of insulation boards is done according to the floating-buttering method. Use the bitumen primer weber.tec 901, diluted with water in a ratio 1 : 10 parts by volume on the substrate and apply a thin bonding layer of bitumen in a thickness of approx. 1 - 2 mm.

  4. 4. Lay the hard foam insulation boards onto the fresh scratch layer in order to obtain full-surface bonding.

  5. 5. The insulation of the socket part provides a transition between the earth-contacting insulation material and the ETICS (external thermal insulation composite system) on the facade.

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