Closed Valley Roof Installation

Fasteners placed in the exposed center area.

Closed valley roof installation.

Roof mastic applied along sides of valley flashing. With a metal liner nail 1 2 inch outside the liner. For a closed valley shingles are installed across the joint where planes intersect. 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.

Indeed the overlapping shingles make the roof look very unsightly. Avoid the following common errors. Seal each shingle to the liner and overlapping shingle with a 3 inch wide bead of plastic roofing cement. 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.

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. With each new course roofing shingles continue up the valley. With a roll roofing valley keep the nails at least 6 inches from the valley centerline. From the ground it looks as though the shingles meet in a clean line in the center of the valley.

Closed cut valley installation details for asphalt shingle roofs. What is a closed valley roof. Failure to extend the entire width of the metal valley flashing beyond the eave of the roof. Before the installation of a shingle roof assembly the roofing contractor installs an underlayment over the entire roof deck.

When finished the valley and its underlayment will be completely covered with asphalt shingles. Further they wear out faster than a metal valley. Closed cut valleys also called closed valleys are installed quickly and have a cleaner sharper look than woven valleys. 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. Punctures in the center of 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. One layer of shingles actually crosses the valley beneath the other.

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