Velux GGU INTEGRA Instrukcja Użytkownika Pobierz pdf (Strona 21)

Installation of a roof window

VELUX 21

Exterior

UNDERFELT

For the easiest connection to underfelt, use underfelt collar BFX.

The underfelt collar is made of diusion open material and can

therefore be used for both ventilated and unventilated roof con-

structions.

Fix the underfelt collar to the frame on all sides, shape it around

the battens and ﬁx it to the counter battens.

Position the drainage gutter immediately above the ﬁrst continu-

ous batten above the window so that it can drain o water from

the underfelt above the window.

Fit self-adhesive butyl strips supplied as shown (a) to seal the felt

where cut over the rafter.

Fold the underfelt collar and then the existing underfelt down into

the drainage gutter and ﬁx with brackets supplied (b).

To position and ﬁx the underfelt collar correctly below the window,

cut underfelt collar as shown (c).

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Velux GGU INTEGRA Instrukcja Użytkownika Strona 21