Valley Roof Flashing Details

Fasteners placed in the exposed center area.

Valley roof flashing details. To secure the roof valley flashing nail it down carefully. Gibraltar drip edge flashing can be used with asphalt shingles or metal roofing panels. Extra nails may increase the risk of leaks. 4 biggest roof flashing errors to avoid no matter what the age of a building there is one simple universal truth.

There are two common methods for completing the flashing of a valley in a shingle roof system. Drip edge metal valley flashing dormer chimney and kickout flashing are types of roof flashing that shed water away from the connections between roofs walls chimneys and other building assemblies. The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak. Getting the details right.

Closed cut valley fully replaced with new metal valley flashing. Then starting at the base of the valley center your first piece of flashing in the valley. As the saying goes if you can keep the water out away from the building it can last forever. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.

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. More product details close. Open valleys have metal flashing to protect this critical area of the roof. 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.

Lile points out that valleys lined with roll roofing are not as durable. Water is a buildings worst enemy. The extra kick at the bottom of the face directs run off away from the structure. One of the details that varies between homes is the method of flashing the valley areas of the roof.

While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. Punctures in the center of the valley. Closed valleys or open valleys. Failure to extend the entire width of the metal valley flashing beyond the eave of the roof.

Roof mastic applied along sides of valley flashing. Avoid the following common errors. Only nail at the edges with only enough nails to hold it in place.