Our home has a single-story extension that was built about 3-4 years ago (by previous owners). The room has six velux skylights. It is a lovely room BUT when it rains heavily, water marks are showing on the ceiling (usually right near the skylights). At first it was only below one skylight. When it rained last week however and I was here to notice it, there was water staining showing near three of the six windows, usually near joins in the plasterboard that forms the ceiling. MOst of these have dried out now. My gut instinct is that because the roof pitch is low (v close to the 15 degree min for velux installation) AND because the rain was very heavy, the flashing around the windows was/is not adequate. What do you think I will need to do to rectify the problem? Would 'extra' flashing be available from Velux?