Roof coating: These materials are used


Roof coatings are not only intended to give roofs a new sheen, but also to ensure longer durability and protection of roof tiles. There are a variety of materials available in stores. Also, companies sometimes process very different coatings. Read here what's on the roof.

Depending on the material of the roofing

The different forms of roofing naturally require different coatings, respectively. The material already specifies the basic selection of coating materials.

Common roof coverings are:

  • Concrete roof tiles
  • classic clay roof tiles
    Fiber cement boards or shingles

These materials have different surface finishes, and therefore must be coated differently. Even in the case of coatings suitable for a substrate, however, there are sometimes considerable differences in quality.

Quality of the coatings

The quality of the individual coatings can be very different. It's all about the durability of the coating.

Inferior coatings, which are also applied in a low layer thickness, lead to rapid abrasion of the coating due to weathering. That should not happen in view of the high costs. By far the most coatings are made of polyurethanes - this material offers the best overall properties for a roof coating.

Nano-coatings

Nanostructured coatings are available for various substrates. The binder used there is usually fluoropolyurethane. It is considered one of the most resistant binders.

Its essential features are:

  • highly UV-stable
  • continuously flexible
  • cold and heat resistant
  • acid-resistant (against acid air pollutants)
  • alkali-stable
  • high resistance to frost and thawing

Due to the nanostructuring dirt particles can not hold and are washed off by the rain again. This self-cleaning effect can occasionally be reinforced by certain particles.

Metal oxide particles

Particles of special metal oxides embedded in the coating also protect against algae and lichens and do not allow fungal growth on the coated roof tiles.

excipients

In the case of particularly high-quality coatings, auxiliaries are also used which are intended to preserve the shade of the roof over the long term and help to preserve its gloss.

Standard for weather resistance

Roof coatings must always be weatherproof according to DIN 18363. A roof coating that does not demonstrably fulfill this requirement should not be used if possible.

Primer or primer layer

Some coatings require a separate primer, other polyurethane coatings require only a primer layer. The disadvantage is that true primers usually provide much more stable adhesion than a simple two-coat application.

Primer layer in practice means only that the coating is applied twice. The first order is usually diluted, the second order referred to as "top coat" is pure. The two-layer application system should be suggested that this is a "real" primer. That's not the case.

Processing of roof coatings

In addition to the quality of the roof coating itself, especially the processing has a significant impact on the final result. Above all, the layer thickness achieved plays an essential role in the durability.

High-quality coatings that are applied too thinly or improperly do not really provide lasting protection.


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