Building Flach Flat roofs are widespread, especially in garages. Since flat roofs but tend to leaks quickly, they must be re-covered at regular intervals. This new covering is called the flat roof "caulking", "ceilings" is rather colloquial. There are various sealing techniques available.

Flat roofs must be checked for leaks every year. They will be covered again approximately every 10 to 15 years. For ceiling different systems are available.

Flat roof covering with bituminous membranes

Flat roof covering with EPDM foils

  • Flat roof covering with a coating of liquid plastic
  • Covering a flat roof with bituminous membranes
  • For covering the flat roof with bitumen membranes, you can again differentiate between three different laying systems.

Welding of bituminous membranes

Cold laying of bituminous membranes

  • Liquid bitumen pouring followed by bituminous membranes
  • Welding the flat roof with bituminous membranes
  • The rolled-up membranes are heated at the bottom with a gas burner just before rolling out so that the bitumen bonds better to the substrate , The bump-laying bituminous membranes are then welded together at the joint and thus sealed. Welded bitumen is laid either in two or three layers, whereby each layer is always laid transversely to the underlying. Decken Covering the flat roof with cold-laid bitumen membranes
For bitumen membranes that are suitable for cold laying, you will find a removable foil on the underside. Underneath is a cold glue layer. Even at the joints, the seams are then sealed with cold glue. Cold laid bituminous membranes are mainly used as a vapor barrier for the underlying flat roof.

Liquid Bitumen Casting G The casting of liquid bitumen into which the bitumen membranes are laid is an obsolete and no longer widely used technique. That's why we just want to mention it here in addition.

The flat roof covering with EPDM foil

EPDM foil is made of synthetic rubber. While bitumen is slowly dissolved by water over time, EPDM is tough. But the protection against ozone and UV radiation is much better.

If an additional gravel layer has been applied as UV protection and temperature protection, this can now be omitted. But beware: there are roofs that are constructed so that gravel loading is part of the construction. In addition, the gravel serves as a reservoir for rainwater and meltwater.

The EPDM film is laid without glue and only glued to the web overlaps. At the edges (roof penetrations, wall connections), the film is also glued. A roof covered with EPDM film can also be greened.

Liquid plastic for flat roof sealing

Liquid plastic is becoming increasingly popular as a coating for flat roofs. Modern liquid plastic has similar properties as the EPDM film, except that here is a seamless seal.

In addition, a special fleece can be inserted. This is also used on wall closures and penetrations. In addition, you can also waterproof drainage deep.

Conclusion: best possible coverage for a flat roof

The best possible coverage is the liquid plastic. However, only if appropriately high-quality products are used. For a long time liquid plastic coatings could only be found on the roofs of company buildings.

However, if you are not afraid to re-cover your flat roof every 10 to 15 years, laying with bituminous membranes is also very efficient and cost-effective, but recurring. However, the trend towards flat roof greening is to be advised to EPDM films, as they are weather resistant and durable. The mechanical burden of the greening is also no problem for high-quality films.

Tips & TricksThe coating of your flat roof with liquid plastic can also be carried out without previously removing old coverings with bituminous membranes. From the experience required, the liquid plastic coating is also recommended. However, very accurate work is important for degrees. Haus The house journal offers you numerous other contributions to flat roofs. Here you will also find instructions for [coating flat roofs] with liquid plastic or for laying bituminous membranes.

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