Velux GGU INTEGRA User Manual download pdf (Page 97)

Building physics

VELUX 97

Rooﬁng material

The rooﬁng material makes up the exterior weathershield that is

the primary protection against precipitation.

Rooﬁng materials are available in a large number of types and

materials but regardless of this condensation will form on the un-

derside of the rooﬁng material and this moisture must be ventilated

to the outside. Therefore there must be a ventilation path under the

rooﬁng material.

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Velux GGU INTEGRA User Manual Page 97