Closed Valley Roof

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.

Closed valley roof.

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. Before the installation of a shingle roof assembly the roofing contractor installs an underlayment over the entire roof deck. This might lead to annoying leaks in heavy rains or at the very least a damaged roof underlayment. Closed cut valleys are notorious for their ugly looks.

A variation of closed cut valley. Pros and cons of a closed valley roof architects often prefer closed valleys to open valleys as they feel that it gives a home better architectural appeal. Further they wear out faster than a metal valley. The closed variation is a flashing that has been completely covered with shingles while in the open variation will have the flashing completely exposed to the elements.

One variant of the closed cut valley is the california valley also called long island valley and new jersey valley. When finished the valley and its underlayment will be completely covered with asphalt shingles. Ultimately laying any shingle in a valley can restrict proper water and debris flow unlike the metal flashing used in an open valley. What is a closed valley roof.

This roof is on a small cabin in the back of beyond and the only valleys will be on 3 small dormers with about 6 feet of valley per side so i m not sure the water will wear out the valley shingles argument will work. The self adhering section acts as the lining for the valley. These disadvantages are neutralized by their simplicity of installation. For a closed valley shingles are installed across the joint where planes intersect.

Indeed the overlapping shingles make the roof look very unsightly. Roofers on the other hand often prefer an open valley because they feel it is more practical. With each new course roofing shingles continue up the valley. 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.

If you have a shingled roof as most torontonians with a sloped roof tend to have then you will have one of two kinds of valleys on your home.