When a homeowner reports a leaky skylight, the problem could be the skylight itself, the flashing around the skylight, or simply excessive condensation on the glass. In the case of replacing the two 25+ year-old roof windows described in this article, the main problem was that the insulating glass had failed, though some water staining was present. Using that project as an example, I describe the belt-and-suspenders approach I used to install a pair of new Velux VS M06 manual "Fresh Air" skylights to replace the failing units. As you click through the slideshows below, you'll see that I pay a lot of attention flashing the new unit to the roof deck, because that is where most leaks occur, regardless of why the existing unit failed.

Photos by Emanuel Silva