Open Vs Closed Valley Roof

Valleys are created where two roof slopes meet.

Open vs closed valley roof.

An open valley has a gap usually about 6 inches between the tile or shingles at the valley area. For a closed valley shingles are installed across the joint where planes intersect. Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed. 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.

A closed valley is where the tiles or shingles are butted up against each other in the center of the valley. In comparison to a closed valley an open valley adds another layer of lining into the valley. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. 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. With each new course roofing shingles continue up the valley. There are two methods for sealing valleys. Moving on here are a couple of things to think about when deciding open or closed.

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