Roof Repair Valley Flashing

Toronto s roof repair specialists http www mrroofrepair ca show the cause of a major interior roof leak.

Roof repair valley flashing.

How to repair roof flashing small holes or corroded spots in flashing can be easily repaired. A crack in the valley can cause major damage and i. Plug pinholes with roofing cement and patch holes up to about 3 4 inch in diameter with a patch from the same material as the flashing. Roof flashing is a thin material usually galvanized steel that professional roofers use to direct water away from critical areas of the roof wherever the roof plane meets a vertical surface like a wall or a dormer.

Then install a non corrosive metal valley flashing of 24 minimum width lap successive sheets of metal flashing a minimum of 12 inches and seal laps. This valley has seen its better days but the critical spot carrying water past the image. If the ice and water shield is missing then you will have to remove the shingles on both sides along the valley put ice and water shield in place and re shingle the roof. Metal flashing is used to divert water.

Nrca lile recommends that roof valley flashing metal for open roof valleys should be 26 gauge 0 45mm galvanized steel or equivalent noncorrosive nonstaining metal. In other cases shingles are overlapped to make a valley and water from harsh rains can find a way under the shingles. A metal lining under the membrane secures that the valley will never puncture again. Install an underlayment centered in the roof valley.

You may want to carefully measure the flashing and only lift up as many shingles as you need to get that into the roof or you may want to lift up a number near to the valley in order to ensure that the roof is fully protected in the future. First roughen the area around the hole with a wire brush or sandpaper and then clean it. Repairing a roof valley involves removing some shingles and installing a. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.

A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water. Flashing is installed to surround roof features such as vents chimneys and skylights. Flashing a humpy old roof valley requires a little give and take and a backup plan.