Flat roofs coating

In the construction of domestic houses, flat roofs are modern and elegant. In commercial and industrial construction, too, there is often no reasonable alternative (e. g. production or storage buildings). This type of roof, however, requires the consideration of various aspects such as drainage, the impermeability of the roof and thermal heating.


The term flat roof is understood as a roof construction with a slant of less than 10 degrees. A flat roof consists of a floor slab with bitumen or synthetic sealing and is thus relatively cost-efficient as far as design and construction work are concerned.
Flat roofs are particularly suited to photovoltaic/solar modules, since the collectors can be mounted on racks at an ideal angle, thus significantly improving the efficiency.Cooldry Hausdach


The danger of water penetrating is considerably higher with flat roofs, therefore they require significantly more maintenance. Uneven areas, as well as defects, lead to reduced drainage of rainwater, which means that humidity will enter as a long-term effect. If this absorbed moisture then freezes, blisters and large cracks will develop.


In addition, flat roofs are particularly exposed to environmental impact and are thus among the elements of a building that have to withstand the highest strain, i.e. through:

  • external moisture – precipitation and standing water (puddles)
  • extreme temperature changes from -20 ° to + 80 °C and the resulting considerable material expansion often leading to expansion cracks (in particular at interfaces between dry and humid areas or sunny and shaded surfaces)
  • extreme heat build-up, particularly on dark roofs such as those covered with bitumen (tar paper)
  • UV radiation (and the resulting material fatigue)
  • mechanical strain due to
    - building movements
    - strain due to pressure and thrust
    - bending of structural elements

If a flat roof sealing is not permanently resistant to such strain (or, in the case of very old roofs, the natural aging process has already advanced too far), damages to the roof shall eventually occur - the flat roof becomes permeable.
Often it is hardly possible to detect the initial stages of a damaged flat roof. However, the defect increases, in many cases with serious consequences and lasting damage to the structure of the building, the removal of which is extremely costly.

This is exactly where CoolDry – Reflective comes in. An excellent and cost-effective solution for the efficient coating of roofs, preventing excessive heating-up and providing a perfect sealing against penetrating water.