Open Vs Closed Valley Roof

What is an open valley roof.

Open vs closed 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. Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed. Furthermore the description of the roofing company whose closed valley failed seemed to fit the profile of a fly by night roofing company and so i d have to assume that workmanship and expertise was secondary to making a quick buck. 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. A closed valley is where the tiles or shingles are butted up against each other in the center of the valley. With each new course roofing shingles continue up the valley. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed.

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. There are two methods for sealing valleys. 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.

In comparison to a closed valley an open valley adds another layer of lining into the valley.