Closed Valley Roof Installation

Closed cut shingle valley installation.

Closed valley roof installation.

Fasteners placed in the exposed center area. Incorporated into the underlayment may be a self adhering ice and water shield or another type of underlayment that is a heavier gauge than the underlayment that covers the remainder of the. Closed cut valleys also called closed valleys are installed quickly and have a cleaner sharper look than woven valleys. Failure to extend the entire width of the metal valley flashing beyond the eave of the roof.

One layer of shingles actually crosses the valley beneath the other. What is a closed valley roof. When finished the valley and its underlayment will be completely covered with asphalt shingles. From the ground it looks as though the shingles meet in a clean line in the center of the valley.

Punctures in the center of the valley. Closed cut valley installation details for asphalt shingle roofs. Closed cut valley fully replaced with new metal valley flashing. For a closed valley shingles are installed across the joint where planes intersect.

With each new course roofing shingles continue up the valley. 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. 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.

This might lead to annoying leaks in heavy rains or at the very least a damaged roof underlayment. These disadvantages are neutralized by their simplicity of installation. 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. 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.

Closed cut valleys are notorious for their ugly looks. Before the installation of a shingle roof assembly the roofing contractor installs an underlayment over the entire roof deck. With a metal liner nail 1 2 inch outside the liner. 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. Further they wear out faster than a metal valley.