Closed Valley Roof Installation

With each new course roofing shingles continue up the valley.

Closed valley roof installation.

With a metal liner nail 1 2 inch outside the liner. Closed cut valleys are notorious for their ugly looks. Punctures in the center of the valley. 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. One layer of shingles actually crosses the valley beneath the other. Further they wear out faster than a metal valley. Roof mastic applied along sides of valley flashing.

Indeed the overlapping shingles make the roof look very unsightly. Failure to extend the entire width of the metal valley flashing beyond the eave of the roof. What is a closed valley roof. Closed cut valleys also called closed valleys are installed quickly and have a cleaner sharper look than woven valleys.

Closed cut valley installation details for asphalt shingle roofs. These disadvantages are neutralized by their simplicity of installation. 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. Fasteners placed in the exposed center area.

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. From the ground it looks as though the shingles meet in a clean line in the center of the valley. With a roll roofing valley keep the nails at least 6 inches from the valley centerline. This might lead to annoying leaks in heavy rains or at the very least a damaged roof underlayment.

For a closed valley shingles are installed across the joint where planes intersect. Avoid the following common errors. Seal each shingle to the liner and overlapping shingle with a 3 inch wide bead of plastic roofing cement. 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.

Closed cut shingle valley installation. Closed cut valley fully replaced with new metal valley flashing.