Velux GGU INTEGRA Manuale Utente Scaricare il pdf (Pagina 68)

Special roofing materials

68 VELUX

Unfelted roofs

When installing roof windows in older roofs where rooﬁng felt may

not be present it is still advisable to use an underfelt collar such as

VELUX underfelt collar BFX around the window. Alternatively, use

underfelt material in rolls.

The underfelt collar must end under the bottom ﬂashing section.

Lead the collar to the second row of tiles at the sides of the win-

dow and roll it to form a "sausage" that ensures a tight connection

under the top of the tiles as shown. Fix the collar to the window

with butyl strip and staples. Tape overlap with a suitable tape.

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Velux GGU INTEGRA Manuale Utente Pagina 68