Closed Vs Open Valley Roof

What is an open valley roof.

Closed vs open valley roof.

The shingles completely cover the underlayment and they become the valley lining itself. Another consideration is the outdoor temperature. Find out the differences before you talk to a roofing expert. An open valley relies on metal flashing for protection.

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. Valleys are created where two roof slopes meet. 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.

Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed. What s the difference between a closed and open valley roof. In the closed valley method the shingles are installed onto the roof. Open valley shingle installation.

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. There are two methods for sealing valleys. Roofers on the other hand often prefer an open valley because they feel it is more practical.

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. Open valleys and closed valleys. For a closed valley shingles are installed across the joint where planes intersect. I would probably say go with the open valley if your roof is being installed in colder temperatures.

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. That flashing is left exposed so the roof has visible lines of metal running down the valley. 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.

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.