Wednesday, September 9, 2009

Flashing The Front Of The Dormers

Any time there's a change in a wall-to-roof plane, it's a possible trouble spot for moisture problems. I've installed aluminum flashing (known as apron flashing) where the main roof meets the front wall of the dormer. The flashing sits on top of the shingles and then continues up the wall underneath the housewrap. This gives the best protection against water getting underneath the shingles.

At the corners of the dormers, I've also fashioned a kick-out flashing which continues past the step flashing. This will prevent water from running down the side of the dormer and turning the corner to possibly get in underneath the apron flashing.

Once everything was in place, I added a bit of silicone sealant to the inside seams and brought the housewrap down in front of the flashing.