Closed Vs Open Valley Roof

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

Closed vs open valley roof.

Valleys are created where two roof slopes meet. Meanwhile on an open valley roof the metal lining that prevents water from seeping into the underlayers is left exposed. An open valley relies on metal flashing for protection. The shingles completely cover the underlayment and they become the valley lining itself.

For a closed valley shingles are installed across the joint where planes intersect. What s the difference between a closed and open valley roof. There are two methods for sealing valleys. Open valley shingle installation.

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. Another consideration is the outdoor temperature. I would probably say go with the open valley if your roof is being installed in colder temperatures.

In the closed valley method the shingles are installed onto the roof. With each new course roofing shingles continue up the valley. Open valleys and closed valleys. In comparison to a closed valley an open valley adds another layer of lining into the valley.

The reason that many roofers like an open valley is that. 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. 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. On a closed valley roof the shingles extend to the valley area completely closing it off.

This essentially extends the asphalt shingles through the valley so the roof surface covers or closes the valley area hence the name. 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. Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed. 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.

After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed.