Metal Roof Valley Flashing Detail

This valley flashing material can be manufactured from any metal that will resist the effects of weather acid rain and other contaminants.

Metal roof valley flashing detail.

Some homeowners do not like the look of open valleys while others feel the metal accentuates the roof s shape particularly if copper or painted flashing is used. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley. Special pricing available for large quantities. The top joinery of both valleys when they meet on the same plane of roof is shown here.

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. 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 this collection of 18 articles animations and videos identifies the critical roof flashing areas illustrates durable roof flashing details and shows how to flash roofs. Flashing is installed to surround roof features such as vents chimneys and skylights. As the asphalt shingles are installed over the roof deck the shingles are extended into the valley.

An open valley relies on metal flashing for protection. Lile points out that valleys lined with roll roofing are not as durable. 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. With a clean valley you can lay down some peel and stick roofing membrane.

Fold the top over the roof ridge and cut the bottom along the drip edge metal. I have my valley custom made with water trough to help with leaking b. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Valley flashings are custom fabricated to any measurements and angles and usually measure 10 in length but can also be we can also match any profile.

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. That flashing is left exposed so the roof has visible lines of metal running down the valley. Galvanized steel aluminum and copper can all be used.