Apply bitumen thick coating - you need to know that

Thick bitumen thick coatings are often used to seal the basement walls on the outside. How to apply these coatings correctly, which methods of application are there, and what to look for, read our article.

Apply the coatings

On a properly prepared surface you can apply the coating in 3 different ways:

  • by simply brushing (only possible with very small layer thicknesses, as a coating)
  • by trowelling and
  • by spraying (for spraying but special machines are necessary)

The processing of the thick coating also differs depending on whether it is a one-component or a two-component product. 2K products must first be mixed together, 1K products are ready to use immediately.

Surface preparation

When underground, it must first be ensured that this is sustainable, sufficiently resilient and dry. For this he must also be completely free of impurities and completely dust-free.

After cleaning (be sure to proceed thoroughly!) Depressions and open joints must be completely closed. Sealing mud as substrate is recommended, preferably in two to three layers and allow to dry sufficiently. Only work on completely dry ground may be started.

Beforehand, a primer is applied (bitumen primer.

To be considered during processing

Depending on the manufacturer, there may be specific requirements for temperature and humidity during processing. These requirements, as well as further processing instructions, must always be met with great accuracy. The thickness of the layer always depends on the setting
Load case. At least 2 mm layer thickness are always required, 3 mm to 5 mm are optimal. You can measure this while still wet with a so-called layer knife and check.

It must always be applied in at least two layers, so that evenly uniform layer thicknesses are achieved everywhere. Between the layers, you can then also insert additional tank fleece.

Edges and corners must always be chamfered, as well as foundation projections. Here a hollow trowel is constructed to avoid cracks.

After application, the layer must be completely protected from frost and moisture, but also from too much solar radiation or wind, until completely hardened (observe manufacturer's instructions).

Tips & Tricks

As a further protection for the coating either bitumen membranes are glued to the cured layer, or so-called knobbed platelets. Also Styrodur Platen are a possibility. If possible, the thick bitumen coating should not come in contact with the soil directly, as it may degrade over time.

Video Board: FOUNDATION WATERPROOFING – against ground moisture and pressurized water due to EN15814