Roofs With Closed Valleys

The three methods to shingle a roof valley.

Roofs with closed valleys.

Closed cut valleys also called closed valleys are installed. Closed valleys protect the roof lining from abrasion that water run off would cause and are therefore quite durable options. Plus cutting the closed cut valley shingles can happen after the rest of the roof is shingled. In general the closed cut valley method implies stretching one side of the shingles beyond the valley while those on the other side are trimmed.

When finished the valley and its underlayment will be completely covered with asphalt shingles. Woven valley shingle installation. For a closed valley the roofer will install the shingles onto the roof deck and extend the asphalt shingles through the area where opposing roof planes meet so that the shingles cover or close the valley area. A closed valley is where the tiles or shingles are butted up against each other in the center of the valley.

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. In the closed valley method the shingles are installed onto the roof. This essentially extends the asphalt shingles through the valley so the roof surface covers or closes the valley area hence the name. The main advantage of closed valleys is that they protect the roof from snow and ice build up however in florida this is not an issue that needs to be considered.

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. Roofing material manufactures or roofing associations may have recommended installation guidelines for their products or for various roofing materials. It is popular because the two roof planes do not need to be shingled at the same time. Closed cut valley even if i work toward the valley with three tab shingles cut valleys are faster than woven valleys hands down.

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. This is almost the same as the closed roof valley method except a pre bent metal valley lining is installed instead of a secondary roof underlayment. 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. With a closed cut valley there s no need to shingle the two roof planes at the same time.

The shingles act as the valley lining and protect the surface from water runoff. The shingles completely cover the underlayment and they become the valley lining itself. For a closed valley shingles are installed across the joint where planes intersect. With each new course roofing shingles continue up the valley.

To achieve a woven valley installation a roofing professional lays shingles in the valley and weaves them.