Open Vs Closed Valley Roof

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

Open vs closed valley roof.

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

An open valley has a gap usually about 6 inches between the tile or shingles at the valley area. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. In comparison to a closed valley an open valley adds another layer of lining into the valley. Moving on here are a couple of things to think about when deciding open or closed.

Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed. What is an open valley roof. There are two methods for sealing valleys. Valleys are created where two roof slopes meet.

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.