Perimeter insulation

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Right in the picture: Perimeter insulation made of XPS

As perimeter insulation refers to the insulation building parts of buildings and structures on their outside. This can be located below the floor slab of a building or on the outside of a basement wall integrated into the ground .

The insulation must be water and pressure resistant, therefore closed- cell foam materials are used , e.g. B. extruded polystyrene rigid foam sheets or foam glass sheets , for some years now recycling materials such as expanded glass , glass foam granulate and foam glass sheets . Glass foam granulate is made exclusively from waste glass.

The insulation material is attached outside the waterproof layer (e.g. bitumen paint or plastic film). Perimeter insulation can also be "packed in" with the sealing form of the K-tub . The insulation panels are glued so that they are not shifted when the backfill of the construction pit settles. Particularly in the case of permanent or long-lasting pressing water (groundwater), the building authority approvals of the respective manufacturer must be observed - e.g. For example, the plates must be glued over the entire surface with a suitable adhesive so that backwashing with water is excluded.

The waterproof perimeter insulation should not be confused with the wall protection panels or drainage panels that are frequently used , which are not approved as insulation. These open-pored, bituminous-bound foam polystyrene spheres only serve to protect the outer water barrier layer (e.g. bitumen paint ) against damage when excavated earth is returned or for drainage along the wall in contact with the earth. There is also perimeter insulation that can take on drainage tasks through embossed channels or a 2-component structure.

Since the Energy Saving Ordinance came into force , the importance of perimeter insulation has increased.


Perimeter insulation can be exposed to the following loads:

  • Earth pressure (possibly increased by traffic loads ),
  • Earth moisture ,
  • Seepage water , backwater or pressing groundwater,
  • Diffusion processes and
  • Frost-thaw alternation in the area close to the earth's surface (specifically as deep as frost penetrates the earth).

See also


  • Winfrid Hauke, Rolf Thaele, Günter Reck: RWE Energie Bau-Handbuch. 12th edition. Energie-Verlag, Heidelberg 1998, ISBN 3-87200-700-9

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