Flat roof ventilation prevents damage


Flat roofs are no longer always constructed with concrete. Especially when a flat roof with a wooden construction has been selected, the ventilation of the construction is very important. Otherwise, moisture and mold can spread quickly.

Insulation level of the flat roof Venting

Also, a flat roof with a wooden structure should be provided as well as a pitched roof with a full rafter insulation. The ventilation of the flat roof is made by an elevation, which can simultaneously produce the roof pitch.

This construction method is often used in prefabricated houses, since the individual elements and the entire roof structure can be prefabricated. This makes the construction weather independent, because many manufacturers of prefabricated houses manufacture the elements in a factory hall.

Rules for required ventilation

The technical rules for roofers and plumbers specify the rules for ventilating the flat roof construction. Since there is no thermal buoyancy in flat roofs, sufficiently ventilated air spaces are recommended.

Here it is also confirmed that a ventilated construction is clearly preferable to a non-ventilated one. In older editions of the technical rules, ventilation cross-sections of 15 centimeters have been proposed, but in recent editions no precise average is more concretely prescribed.

Avoid detours

With the flat roof ventilation no detours may be taken. If the air can not flow directly through the structure, condensation will form that can penetrate the insulation causing mold and moisture damage.

One should always ensure that the ventilation openings of the flat roof are arranged opposite each other, in order to really ensure the removal of moisture.

Tips & Tricks

Since some points must be kept and the preparation of the ventilation in a flat roof requires a lot of professional skills, you should look in advance for an experienced developer and if possible, look at some of his buildings.


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