Open Cut Roof Valley

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.

Open cut roof valley.

The metal is usually pre painted to best complement the shingles color blend. In this video i show you how i do the valleys on a shingle roof. I m trying to decide on the best way to do the valleys open metal valleys or closed cut ones. The cut edge then is sealed with roof cement.

Open valleys may be susceptible to water backup if the cut off shingles are not properly trimmed potentially causing roof leaks. That flashing is left exposed so the roof has visible lines of metal running down the valley. One nail goes into the top section of the shingle where it covers the valley metal. The rest of the nails go in the nailing strip.

Roof is 5 12 slope with a couple of valleys. I want my roof to be as leak proof and long lasting as possible. No one of this affirmat. See our discussion of alternative flashing materials found.

The seam where the two planes of roofing meet are aesthetically woven together to form an interlaced design which creates a seam that matches the contours of the roof. However it is said that provided the rest of the roofing shingles were properly installed and are performing properly open valleys will perform better over time than closed valleys. With an open valley a strip of metal will be visible on the roof wherever two opposing roof planes meet. I finish the cut edge with a double bead of roof cement the same as for the open metal valley.

Roofing shingles are installed then cut and sealed where they overlap the metal channel. The shingles are then cut out of the valley area opening the surface of the valley lining to water run off and the environment. For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck. An economical version uses two layers of roll roofing for the lining which should last as long as an asphalt roof.

Open valley shingle installation. With a heavy gauge noncorrosive metal lining open valleys are the most durable valley and the most costly. A chalk line is then used to strike a line from the top of the valley to the bottom of the valley. Can t afford standing seam metal though so it will be mid grade architectural asphalt shingles installed with meticulous detail.

At flashing wall details. And either an organic or modified underlayment depending on whether tiles or shingles are being. An open valley relies on metal flashing for protection. Many roofers cut the shingles across because they say it s safer.

From the stepped off main part of the roof run shingles into the valley and cut them square from where the bottom corner intersects with the shingles nailed along the valley line. I m in a mixed humid climate zone 4a.