Closed Vs Open Valley Roof

An open valley relies on metal flashing for protection.

Closed vs open valley roof.

Meanwhile on an open valley roof the metal lining that prevents water from seeping into the underlayers is left exposed. I would probably say go with the open valley if your roof is being installed in colder temperatures. 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. In the closed valley method the shingles are installed onto the 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. Valleys are created where two roof slopes meet. Open valleys and closed valleys. Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed.

For a closed valley shingles are installed across the joint where planes intersect. This essentially extends the asphalt shingles through the valley so the roof surface covers or closes the valley area hence the name. On a closed valley roof the shingles extend to the valley area completely closing it off. Shingles may crack when being manipulated around the valley.

That flashing is left exposed so the roof has visible lines of metal running down the valley. Open valley shingle installation. What s the difference between a closed and open valley roof. With each new course roofing shingles continue up the valley.

Find out the differences before you talk to a roofing expert. What is an open valley roof. 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. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed.

The shingles completely cover the underlayment and they become the valley lining itself. There are two methods for sealing valleys. 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. The reason that many roofers like an open valley is that.

Roofers on the other hand often prefer an open valley because they feel it is more practical.