Closed Valley Roof Installation

Fasteners placed in the exposed center area.

Closed valley roof installation.

Failure to extend the entire width of the metal valley flashing beyond the eave of the roof. Closed cut valleys are notorious for their ugly looks. Closed cut valleys also called closed valleys are installed quickly and have a cleaner sharper look than woven valleys. Avoid the following common errors.

With a metal liner nail 1 2 inch outside the liner. This might lead to annoying leaks in heavy rains or at the very least a damaged roof underlayment. Roof mastic applied along sides of valley flashing. What is a closed valley roof.

Before the installation of a shingle roof assembly the roofing contractor installs an underlayment over the entire roof deck. If you are installing a closed valley the roofer will install shingles to the roof deck and extend the shingles through the valley so that it covers the entire valley area. Closed cut shingle valley installation. For a closed valley shingles are installed across the joint where planes intersect.

Closed cut valley fully replaced with new metal valley flashing. According to long time iko sales representative jeff tessaro closed valleys for residential construction have been popular since he was a roofing contractor in the late 90 s. When finished the valley and its underlayment will be completely covered with asphalt shingles. Punctures in the center of the valley.

Further they wear out faster than a metal valley. From the ground it looks as though the shingles meet in a clean line in the center of the valley. It installs and looks almost the same as a regular cut valley where the shingles on the low volume roof plane are installed first and pass through the center of the valley by at least 12 in. Seal each shingle to the liner and overlapping shingle with a 3 inch wide bead of plastic roofing cement.

California cut valleys make for a great closed cut valley however we have an installation trick to improve performance in areas of high winds snow or rain. One layer of shingles actually crosses the valley beneath the other. Then rather than cutting the shingles on the high volume roof plane a row of shingles is installed with the exposure edge facing the valley center. These disadvantages are neutralized by their simplicity of installation.

Indeed the overlapping shingles make the roof look very unsightly. With a roll roofing valley keep the nails at least 6 inches from the valley centerline.