Roof Leak Valley Flashing

Find out how to rebuild the valley and use the right flashing so that you get up to 20 years from the flashing.

Roof leak valley flashing.

First roughen the area around the hole with a wire brush or sandpaper and then clean it. When a shingle from either roof intersects and passes over the metal valley flashing it needs to be cut at an angle. Roof vent pipes from plumbing or exhaust vents penetrate the roof and are usually sealed using a collar style flashing made out of a flexible material like epdm rubber or flexible pvc. A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water.

We describe how to construct three common styles of roof valley. Learn how to repair a leak in a roof valley. Open valley closed cut valley and woven roof valley and we include roof valley underlayment and nailing specifications. And damaged flashing is behind most roof leaks.

Leaking roof vent pipe roof vent pipes are common areas for roof leaks. The most common cause of a roof leak where metal flashings are used is shingles that have been improperly cut. Most roofers that install shingles will not have rubber membranes with them to do such areas. In either situation the leaking roof valley can be fixed by removing affected shingles and structural elements and upgrading your roof s flashing.

Most shingle installers will use a thick 30 lb paper as a base for the valley. This article discusses details and specifications for roof valley flashing for best construction roof leak resistance. An ice dam occurs when snow melts and the water freezes when it hits the colder edges of your roof. A flashing is a transitional roofing material that connects the roof material to some other building material or to another part of the roof.

This roof leaks during the snowy part of winter and during storms in the summer certainly due to poor flashing. 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. 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. The soffit that meets the roof is one of the toughest areas to waterproof.

Most roofers that do shingles will use a heavy base paper instead of a rubber membrane. In the photo you can still see signs of an ice dam. Valley areas are prone to leak due to the lack of using proper materials.