Open Vs Closed Valley Roof

Meanwhile on an open valley roof the metal lining that prevents water from seeping into the underlayers is left exposed.

Open vs closed valley roof.

In comparison to a closed valley an open valley adds another layer of lining into the valley. Open valley when compared to a closed valley and open valley adds an additional layer of lining. Repairs to closed valleys are a lot more involved than working on an open valley as is re roofing or making changes to a portion of your roof in the future. 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.

This metal lining can be made of any type of metal that is resistant to the effects of weather acid rain or other contaminants. And while some homeowners may prefer the aesthetics of a closed valley the heavier and thicker the shingle the less likely it is to lie flat across a joint. This valley flashing material can be manufactured from any metal that will resist the effects of weather acid rain and other contaminants. Moving on here are a couple of things to think about when deciding open or closed.

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. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. Once the shingles are installed they don t run through the valley area. A closed valley is where the tiles or shingles are butted up against each other in the center of the valley.

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. On a closed valley roof the shingles extend to the valley area completely closing it off. Closed valleys are very vulnerable to mechanical damage. After the underlayment is placed a pre bent metal valley lining is installed.

This leaves a metal strip or line on the surface of the roof that serves as the valley line. An open valley has a gap usually about 6 inches between the tile or shingles at the valley area.