Closed Vs Open Valley Roof

Find out the differences before you talk to a roofing expert.

Closed vs open valley roof.

Valleys are created where two roof slopes meet. For a closed valley shingles are installed across the joint where planes intersect. On a closed valley roof the shingles extend to the valley area completely closing it off. In the closed valley method the shingles are installed onto the roof.

Shingles may crack when being manipulated around the valley. This essentially extends the asphalt shingles through the valley so the roof surface covers or closes the valley area hence the name. The reason that many roofers like an open valley is that. Meanwhile on an open valley roof the metal lining that prevents water from seeping into the underlayers is left exposed.

What s the difference between a closed and open valley roof. That flashing is left exposed so the roof has visible lines of metal running down the valley. Another consideration is the outdoor temperature. 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.

Roofers on the other hand often prefer an open valley because they feel it is more practical. Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed. Open valley shingle installation. 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.

I would probably say go with the open valley if your roof is being installed in colder temperatures. Open valleys and closed valleys. With each new course roofing shingles continue up the valley. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed.

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. 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. There are two methods for sealing valleys. What is an open valley roof.

The shingles completely cover the underlayment and they become the valley lining itself.