Gravel roof - how good is this roof shape


In a flat roof, the gravel above the bituminous membrane has clear advantages over a bare roof. The black roof area with the roofing felt heats up a lot and as soon as there is dirt on it, the rainwater runs off hard.

Rainwater trickles through the gravel

While on a flat roof covered with roofing felt leaves and mosses can lead to accumulations of dirt that keep the roof constantly wet, the dirt remains on the gravel of the roof and the water can drain through the gravel.

Insulation and dryness

In those places where the roof can not dry, because there may be dirt prevents drying, it will be cooler. In the cold season, this is not only unpleasant, but also costs additional heating energy.

Gravel roof - how good is this roof shape: roof

At the same time the gravel layer keeps the usually very light insulation on the roof and prevents suction effects in storm and wind.

Tar paper or bituminous membrane

No matter how you want to call the roofing felt on a flat roof, it will last much longer with a layer of gravel and, above all, stay tight.

On the one hand, this black roofing felt UV radiation does not like and reacts first with it, that it becomes brittle and cracked. In the second step, the roofing felt becomes leaky.

But not only the roofing felt, especially the seams, where it is welded, dry out and crumble soon. The gravel layer can prevent this damage in the long run without having to work or maintain it.

Gravel roof - here are the advantages in a nutshell

  • Rainwater runs better
  • Better insulation
  • Upper roof layer better secured
  • Protection of the roof itself against UV radiation

Tips & Tricks

In the case of a gravel roof, however, just as in the case of a green roof, the rainwater has already been successfully filtered and can thus continue to be used immediately.


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