First, are you sure it is leaking, and not just condesation?
I fit is leaking, most Velux window sections can be removed from the frame, varies as to model/opening etc, Velux website is usually good for the info for that. The glass section you will find is fitted in by screws from the outside, a metal frame holds the glass unit in place. take the glass unit, the whole window, out of the frame, and lay on the floor, remove screws etc. reseal, done
SD, May 2011
