How To Replace Roof Valley Flashing

The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak.

How to replace roof valley flashing.

From drip edge to valley flashing december 25 2018 drip edge metal valley flashing dormer chimney and kick out flashing shed water away from the connections between roofs walls chimneys and other building assemblies. Pull the nails at that side of the ridge shingles to install. Where valleys run from the edge of the roof to a ridge trim the flashing to fit under the corresponding side of the ridge shingles. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.

W type valley flashing is more rigid for handling so it stays straight and it stops waler rushing down one side of a roof from rushing back up the other side. If your roof valley leak is an old repair gone bad consider having a professional repair the leak properly. Expert advice on how to repair roof flashing and chimney flashing prevent ice dams and solve other roof flashing problems. Roof mastic applied along sides of valley flashing.

I have my valley custom made with water trough to help with leaking b. The top joinery of both valleys when they meet on the same plane of roof is shown here. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.

Open valleys have metal flashing to protect this critical area of the roof. Stop nailing 6 inches from the center. While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. Fasteners placed in the exposed center area.

Closed cut valley fully replaced with new metal valley flashing. Learn the three methods of shingling a roof valley the advantages and disadvantages of each how to choose valley flashing and how to shingle an open valley. Failure to extend the entire width of the metal valley flashing beyond the eave of the roof. When a roof leaks the problem is often due to leaks in and around the metal roof flashing that protects roof edges valleys and the junctions between roofing and obstructions such as chimneys dormers and vent pipes.

Avoid the following common errors. Roof one side of the valley running the shingles across it. Some shingles and flashing may need to be removed and replaced but the roof can usually be saved with a good quality repair.