Closed Vs Open Valley Roof

For a closed valley shingles are installed across the joint where planes intersect.

Closed vs open valley roof.

In comparison to a closed valley an open valley adds another layer of lining into the valley. The shingles completely cover the underlayment and they become the valley lining itself. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. What s the difference between a closed and open valley roof.

There are two methods for sealing valleys. On a closed valley roof the shingles extend to the valley area completely closing it off. Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed. Open valleys and closed valleys.

That flashing is left exposed so the roof has visible lines of metal running down the valley. The reason that many roofers like an open valley is that. An open valley relies on metal flashing for protection. Find out the differences before you talk to a roofing expert.

Shingles may crack when being manipulated around the valley. 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. Another consideration is the outdoor temperature. 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. Meanwhile on an open valley roof the metal lining that prevents water from seeping into the underlayers is left exposed. With each new course roofing shingles continue up the valley. 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.

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. Valleys are created where two roof slopes meet.

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.