Closed Vs Open Valley Roof

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

Closed vs open valley roof.

In the closed valley method the shingles are installed onto the roof. Shingles may crack when being manipulated around the valley. I would probably say go with the open valley if your roof is being installed in colder temperatures. Open valleys and closed valleys.

On a closed valley roof the shingles extend to the valley area completely closing it off. 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. That flashing is left exposed so the roof has visible lines of metal running down the valley. What s the difference between a closed and open valley roof.

Another consideration is the outdoor temperature. Meanwhile on an open valley roof the metal lining that prevents water from seeping into the underlayers is left exposed. There are two methods for sealing valleys. For a closed valley shingles are installed across the joint where planes intersect.

Open valley shingle installation. 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. 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.

With each new course roofing shingles continue up the valley. The reason that many roofers like an open valley is that. In comparison to a closed valley an open valley adds another layer of lining into the valley. 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. Roofers on the other hand often prefer an open valley because they feel it is more practical. An open valley relies on metal flashing for protection. The shingles completely cover the underlayment and they become the valley lining itself.

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