Roofs With Closed Valleys

Woven valley shingle installation.

Roofs with closed valleys.

In the closed valley method the shingles are installed onto the roof. A closed valley is where the tiles or shingles are butted up against each other in the center of the valley. To achieve a woven valley installation a roofing professional lays shingles in the valley and weaves them. 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.

With a closed cut valley there s no need to shingle the two roof planes at the same time. 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. With each new course roofing shingles continue up the valley.

Closed valleys protect the roof lining from abrasion that water run off would cause and are therefore quite durable options. If you are looking to install shingles you might want to consider the closed cut valley method. 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. 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.

This essentially extends the asphalt shingles through the valley so the roof surface covers or closes the valley area hence the name. 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.

The shingles act as the valley lining and protect the surface from water runoff. The three methods to shingle a roof valley. For a closed valley shingles are installed across the joint where planes intersect. The shingles completely cover the underlayment and they become the valley lining itself.

Plus cutting the closed cut valley shingles can happen after the rest of the roof is shingled. 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. 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. An open valley has a gap usually about 6 inches between the tile or shingles at the valley area.

Closed cut shingle valley installation.