
Special roofing materials
68 VELUX
5
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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