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.
Open vs closed valley roof.
Open valleys and closed valleys.
Find out the differences before you talk to a roofing expert.
An open valley has a gap usually about 6 inches between the tile or shingles at the valley area.
With each new course roofing shingles continue up the valley.
Valleys are created where two roof slopes meet.
A closed valley is where the tiles or shingles are butted up against each other in the center of the valley.
There are two methods for sealing valleys.
After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed.
Moving on here are a couple of things to think about when deciding open or closed.
What is an open valley roof.
Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed.
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.
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.