Closed Vs Open Valley Roof

Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed.

Closed vs 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. Another consideration is the outdoor temperature. What is an open valley roof. The shingles completely cover the underlayment and they become the valley lining itself.

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. Some homeowners do not like the look of open valleys while others feel the metal accentuates the roof s shape particularly if copper or painted flashing. 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. With each new course roofing shingles continue up the valley.

In comparison to a closed valley an open valley adds another layer of lining into the valley. Shingles may crack when being manipulated around the valley. Valleys are created where two roof slopes meet. In the closed valley method the shingles are installed onto the roof.

The reason that many roofers like an open valley is that. This essentially extends the asphalt shingles through the valley so the roof surface covers or closes the valley area hence the name. An open valley relies on metal flashing for protection. That flashing is left exposed so the roof has visible lines of metal running down 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. 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.

I would probably say go with the open valley if your roof is being installed in colder temperatures. There are two methods for sealing valleys. Open valleys and closed valleys. Roofers on the other hand often prefer an open valley because they feel it is more practical.

Open valley shingle installation.