Closed Valley Roof Installation

Failure to extend the entire width of the metal valley flashing beyond the eave of the roof.

Closed valley roof installation.

These disadvantages are neutralized by their simplicity of installation. This might lead to annoying leaks in heavy rains or at the very least a damaged roof underlayment. Indeed the overlapping shingles make the roof look very unsightly. With each new course roofing shingles continue up the valley.

What is a closed valley roof. 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 valley installation details for asphalt shingle roofs. Fasteners placed in the exposed center area.

Closed cut shingle valley installation. For a closed valley shingles are installed across the joint where planes intersect. Seal each shingle to the liner and overlapping shingle with a 3 inch wide bead of plastic roofing cement. One layer of shingles actually crosses the valley beneath the other.

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. Closed cut valley fully replaced with new metal valley flashing. When finished the valley and its underlayment will be completely covered with asphalt shingles. 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.

Avoid the following common errors. 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. Before the installation of a shingle roof assembly the roofing contractor installs an underlayment over the entire roof deck.

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 valleys also called closed valleys are installed quickly and have a cleaner sharper look than woven valleys. Closed cut valleys are notorious for their ugly looks. Further they wear out faster than a metal 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. Roof mastic applied along sides of valley flashing.