How To Install Flashing Around A Dormer
All roof penetrations demand to be properly flashed to preclude water damage. This is especially important with dormers because they expose a large wall area to the conditions and create many linear anxiety of vulnerable roof-wall intersections.
Here's a stride-by-step look at how to wink a dormer so that h2o is carried away from those vulnerable areas.
[1]Install roof underlayment upwards to the dormer, cutting information technology a few inches brusk of the roof-wall joints at the front end and side walls. Employ peel-and-stick membrane to the front end wall of the dormer, making sure it overlaps the roof underlayment and wraps upward onto the wall half-dozen or 8 inches. Then exercise the same at the dormer sides, either stretching the membrane (or folding it, later on making a modest cut) around the corner.
[2]Install the balance of the roof underlayment, making sure to roll it up the side walls. Both the peel-and-stick membrane and the underlayment should extend upward the wall higher than the vertical leg of the step flashing.
[3]Install roof shingles to the base of operations of the dormer, notching effectually the corners every bit needed. Lay a dewdrop of roofing cement forth the shingles just beneath the dormer and bed the metal base flashing into information technology. Ideally, this custom flashing will accept soldered corners, but if non, carefully notch the metal at the dormer corners and wrap the vertical leg around the corner onto the side wall. Spike this flashing to the dormer walls, keeping the fasteners as far from the roof-wall joint as you lot can.
[4]The starting time piece of step flashing should extend over the base flashing. Carefully cut it at the bend and plow the vertical leg effectually the corner onto the front wall. Fasten just the roof leg, nailing through the flashing and the shingle into the roof sheathing. Fastening simply the roof leg will avoid problems that may exist caused by movement at the roof-wall joint.
[5]The adjacent asphalt shingle overlaps the get-go slice of step flashing, completely concealing information technology. Install the next piece of step flashing on superlative of this shingle, aligning the lesser edge just above the nailing strip. Once again, spike only to the roof with a nail through the flashing and the shingle. Repeat—shingle, step flashing, shingle, pace flashing—all the way up both sides of the dormer.
[6]At the summit, gyre the roof underlayment up onto the soffit and apply peel-and-stick to seal the roof-soffit connexion. Cover the membrane with a metal closure flashing. This area won't get a lot of bulk water, but the flashing layers volition keep windblown rain and snow from getting behind the roofing.
[7]Finally, install housewrap on the dormer wall, being careful to overlap the top of the step flashing and base flashing by several inches.
Source: https://www.proremodeler.com/how-flash-dormer
Posted by: porterbeires.blogspot.com
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