Closed Vs Open Valley Roof

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

Closed vs open valley roof.

An open valley relies on metal flashing for protection. 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. 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.

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. There are two methods for sealing valleys. Valleys are created where two roof slopes meet. 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. Find out the differences before you talk to a roofing expert. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. Meanwhile on an open valley roof the metal lining that prevents water from seeping into the underlayers is left exposed.

For a closed valley shingles are installed across the joint where planes intersect. 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. The shingles completely cover the underlayment and they become the valley lining itself. The reason that many roofers like an open valley is that.

Open valleys and closed valleys. Open valley shingle installation. In comparison to a closed valley an open valley adds another layer of lining into the valley. I would probably say go with the open valley if your roof is being installed in colder temperatures.

What is an open valley roof. Roofers on the other hand often prefer an open valley because they feel it is more practical. Another consideration is the outdoor temperature. With each new course roofing shingles continue up the valley.

Shingles may crack when being manipulated around the valley.