Retrofit floors in old buildings in a heat-insulating way

With thermal insulation on the floor, you can cut heating costs by up to 20 percent. Although such refurbishment sometimes costs a lot of time and of course money, a high utility value and a significant increase in living comfort are achieved. And: subsidies are waiting too!

Getting cold feet in winter despite well-tempered space heating is one of the most unpleasant experiences in the cold season in-house. Especially in old buildings, this type of living atmosphere turns into a real problem, because at the age of Uromas hardly any value was placed on effective thermal insulation of floors. Those who energetically refurbish today and provide comfort in their own four walls, on the other hand, can even join count on considerable state subsidies.

Where should be applied to the floor insulation?

Basically for all floors that are above unheated basements or for residential areas that are located directly above the ground. Finally, at these particularly cold spots of the building up to 20 percent of the total heating costs of a house consumed. Nevertheless, it must be taken into account in the early planning phase such a refurbishment measure that the thermal insulation of floors is a very complex task, which requires structural understanding as well as certain technical skills.

Possibilities to rehabilitate floors with thermal insulation

Ceilings or floors are static load-bearing elements of a residential building And especially in old buildings, the material brought to light under the floor covering can sometimes cause surprises. Sometimes there are still pipes in the masonry or are hidden in the screed, so that must be decided under the economic aspect, whether instead of thermal insulation in the floor is not better Ceiling of the cellar room below energy technology is brought up to scratch. As a possible and quite common alternative, the installation of a floor heating could be considered.

Materials for effective floor insulation

In addition to the unquestionable cost issue, the selection of insulation materials is linked to the strength and height of the insulating material to be processed. Accordingly, the offer is large that the building materials trade partly in bricks, but also as flexible meterware from the roll to the thermal insulation of the floor. Depending on the technology of their processing will be:

  • Insulating materials in matt form;
  • Bulk insulating materials;
  • Insulating materials for blowing and
  • Stopfdämmung

distinguished. The following materials are mainly used:

  • Polystyrene granules 0.033 to 0.035 (thermal conductivity)
  • Polyurethane granules 0.036
  • Perlite 0.040
  • Rock wool 0,040
  • Cellulose fiber insulation 0.040

The lower the thermal conductivity value (in W / mK), the better the insulation.

Trendy - natural thermal insulation for floors

Meanwhile, there are more and more manufacturers, the insulating material too from natural, ie renewable raw materials launch. The thermal conductivity is between 0.035 and 0.050 W / mk. Especially worth mentioning is the Ability of these natural substances to absorb moisturewithout their insulation effect decreases. However, only wood (including wood shavings) and cellulose were included in the state support programs for thermal insulation flooring, while:

  • flax
  • cork
  • Reed & straw

rather play an insignificant role in the shadows.

Tips & Tricks

who wood fibers used in the form of insulation boards, achieved in addition to top heat values (0.039 to 0.052) one excellent impact sound insulation, In addition, these elements for thermal insulation of the floor very well edit (sawing, drilling, nailing or screwing).

Video Board: Hydronic Retrofit in a Basement Slab: Insulate!