Closed Valley Roof Installation

Roof mastic applied along sides of valley flashing.

Closed valley roof 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. Avoid the following common errors. Fasteners placed in the exposed center area. Closed cut valley fully replaced with new metal valley flashing.

Closed cut valleys also called closed valleys are installed quickly and have a cleaner sharper look than woven valleys. 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. Failure to extend the entire width of the metal valley flashing beyond the eave of the roof. Punctures in the center of the valley.

These disadvantages are neutralized by their simplicity of installation. Indeed the overlapping shingles make the roof look very unsightly. With each new course roofing shingles continue up the valley. Before the installation of a shingle roof assembly the roofing contractor installs an underlayment over the entire roof deck.

Closed cut shingle valley installation. Closed cut valley installation details for asphalt shingle roofs. One layer of shingles actually crosses the valley beneath the other. 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.

Further they wear out faster than a metal valley. What is a closed valley roof. Seal each shingle to the liner and overlapping shingle with a 3 inch wide bead of plastic roofing cement. For a closed valley shingles are installed across the joint where planes intersect.

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. 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. 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. 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. With a roll roofing valley keep the nails at least 6 inches from the valley centerline.