23.03.2018 | BUILDING

Attention - Water – some mistakes during the insulation of concrete surfaces Every builder, professional and amateur, realizes that carrying out a good insulation of foundations and/or flooring in a building is a key element for every structure. A battle with water in building basement, moisture in walls, floorings, is a huge problem that often gives the builders carrying out repairs or building work sleepless nights. In the market there is a vast selection of various materials, means, and preparations for insulation and protection of strip footings, foundations and walls.

A wide range of offered products, as it comes to both a single manufacturer and competitive companies enables the customer to select materials for any type of surface applied in different temperatures and with different degree of soil water logging. Unfortunately, such a situation can be a problem during the selection of the product appropriate for the type of work to be carried out.

What is also important is the way, sequence, and quality of work. No one needs to be convinced that even the best materials would not help when a wrong technology is used or the recommended guidelines included in the product cards are not observed.

In this paper we would like to point out the mistakes most often made, and recommend how to carry out insulation correctly.

Cleaning surface
The first operation, regardless of whether the wall being insulated is new or the insulation in the building is renovated, is a thorough cleaning the surface. For this brushes with thick and stiff bristles are used. If old walls are cleaned a particular attention must be paid to remove the soil filling existing technological cavities. This particularly concerns the holes left after stones and joints.

Appropriately prepared surface has to be primed with a suitable substance, e.g. Izoplast R-W. Keep in mind that the primer layer is considerably thinner than the typical insulation one and its function is to penetrate all cracks, hollows, and pores. Priming walls has to be treated extremely seriously using for this roofing brushes.

Now a time has come to apply the proper insulation layer. For this, it depends on what kind of land the structure is situated on, and whether the insulation is to be of light type (Izoplast B, Izoplast B-W) or heavy (Izoplast 2K-W, or Izoplast Mega Tex). Insulation agents are applied by means of roofing brushes or mechanically. The best way is to apply two (2) insulation layers and after that the wall should be even, and the insulation layer should be a few mm thick.

Time for drying
After all work with insulation compounds is done allow the wall to dry so that moisture could freely evaporate to the air.

An important aspect that has to be taken into consideration and is decisive for the quality of work are the tools used. A brush with too soft bristles will not be efficient enough and will not clean well the wall. A styrofoam float instead of metal one would make applying insulation difficult. It is worth getting the tools indicated in the product user manual.

Selection of appropriate hydro-insulation
The photos below show the effect of wrongly selected hydro-insulation. A customer used a damp-proof insulation when it was evident that a heavy insulation should be used. The water remaining in the excavation penetrated into the building.

Step by step

  • Digging out of the foundations
  • Cleaning the wall
  • Priming
  • Thermal insulations
  • Haunch the wall with drainage gravel

Are you in doubt?

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