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Building physics

104 VELUX

Vapour barrier

The vapour barrier is a membrane of a diusion tight material

positioned on the warm side of the construction of the house. It

prevents vapour from the warm indoor air from reaching the colder

air/surfaces within the wall or roof construction.

If the warm air is not stopped the vapour will condensate on the

cold surfaces. In periods with frost this will result in accumulation

of ice.

In this way more moisture enters than escapes the construction

creating ideal conditions for damaging rot and dry rot.

In addition to reducing the strength and life time of the building

construction dry rot may also result in an unhealthy indoor climate.

This makes the vapour barrier one of the most important compo-

nents in the construction of the building!

Therefore it is very important to the performance and life time of

the construction that the vapour barrier is ﬁtted correctly ensur-

ing absolute air tightness. Especially observe that details such as

joints, penetrations and connections to other components of the

construction are airtight.

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Velux GGU INTEGRA Instrukcja Użytkownika Strona 104