Does a roof coating make sense?

Roof coating is a process that has been around for a long time. However, it has only become really popular in the last few years. This is accompanied by numerous questions for many homeowners. On the one hand, there is the parliamentary group that strongly advises against roof coating. On the other hand - if a roof coating makes sense - the homeowner is faced with the question of under which conditions a roof coating is advisable and when not.

Roof coating - for and against

Two groups have actually formed around the question of the meaning of the roof coating. Some say that a roof coating is of no use at all, instead a roof should be re-covered. The proponents, on the other hand, argue with the value retention of their roof tiles. Many homeowners are literally caught between two stools.

  • Also read - Roof coating or coated roof tiles
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Everyone can recoat a roof - even if they cannot

However, it should not be forgotten that the work steps necessary for roof coating can be carried out by practically any company. No certificates such as a master craftsman's certificate have to be proven. This gives rise to the problem that many black sheep have discovered roof coating as a lucrative field of activity for themselves. The reasons for rejection are justified for many people.

Useful: Execution with high-quality products by the specialist company

In any case, it is important to have the work carried out by a competent company. If you want to coat your roof yourself, you have to rely on high-quality products that meet certain requirements, especially when choosing the material. Then the roof coating can be quite useful. But in order to better understand when and why a roof coating can be useful, one has to understand what the goal of a roof coating is and what it can do.

What does the roof coating do?

Many roof tiles are already provided with a thin coating at the factory. Over the years, however, it loosens and the Dachstein becomes porous. You can tell by the sand that is piled up in the gutter.

This is because when the water runs off the roof, there is of course friction - just as it washes pebbles smoothly in the river bed. So the water wears away the roof tiles. To avoid this, the roof tile is cleaned and then impregnated and coated at the same time.

Roof coating makes sense if certain requirements are met

The coating then offers less friction surface and also seals the roof tiles in a watertight manner. Opponents often claim that the roof would then no longer be open to diffusion, which would lead to the formation of mold inside the house. However, as long as you are using high quality vapor-permeable roof coatings, this argument is not correct. The optimal choice is a high-quality, but also more expensive pure acrylate.

Roof coating cannot always be carried out

However, there are also limits to the roof coating. If the abrasion has progressed too far, there is no way around the new roof covering. An intensive covering of mosses, algae and lichens is often used as an argument for having a roof coating carried out. But that is only partially true. As long as the actual pan coating on the roof tiles is still in place, this does not damage the overgrowth.

Which roof tiles can be coated?

It only becomes problematic when the mosses and lichens grow deep into the stone. They also store water, which penetrates the roof tiles and blows them up when there is frost. These properties also result in the roof tile materials for which a roof coating makes sense.

  • Concrete roof tiles
  • Tile roof tiles
  • Fiber-reinforced concrete panels

The limits of the roof coating

So there are certain circumstances under which a roof coating is (no longer) recommended.

  • the roof tiles have clearly lost too much of their substance
  • the original coating is intact and only lichens and mosses grow on it, but not inside
  • Mosses and lichens can already be found on the inside of the roof tiles and can also be found on the roof structure

If the roof tiles have lost too much of their substance, they must be covered again. If mosses are also found in the interior and on the roof structure, roof structures may even need to be renovated. If the mosses and lichens are on an intact roof tile surface, it is only a visual motivation.

special cases

Asbestos-containing fiber cement panels (colloquially known as Eternit panels) cannot be coated because they must not be cleaned. Of course, asbestos-free Eternit panels are not affected by this.

What does the roof coating do?

A professionally and professionally coated roof is secured again for at least 10 years, i.e. it extends the service life of the roof tiles by at least this period. In addition, the roof coatings are available in numerous color versions, which means that you can also completely redesign your house visually.

Tips & Tricks Professionally working specialist companies take a sample of your Eternit panels and have them examined for asbestos in a laboratory.

Use only a high-quality roof coating that is also permeable.

The implementation of the roof coating should always be placed in the hands of professionals. Even cleaning with water (cold water with a type of water milling machine, otherwise high-pressure hot water) means that the roof structure does not get wet. In addition, the water must dry completely before coating.

Do not react to offers made by "moving companies " at seemingly bargain prices.

The costs of a professional roof coating including cleaning are around a third of a roof covering. The time required is at least two days.

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