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Building physics

96 VELUX

Roof construction

A modern roof is a complicated construction consisting of many

dierent materials with many dierent functions.

1. Rooﬁng material – primarily protects against water (rain and

snow), hail etc

2. Underfelt – protects against rain and snow and serves partly as

wind barrier

3. Bearing construction – rafters, battens

4. Heat insulation – minimises heat loss

5. Vapour barrier – prevents air and vapour penetration

6. Interior ceiling ﬁnish

When this construction is interrupted by the installation of a roof

window, there are o course demands to maintain the integrity of

the roof construction and the connections between the window

and the individual components within it.

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Velux GGU INTEGRA Manuale Utente Pagina 96