Open Or Closed Valley Roof

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

Open or closed valley roof.

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. However open valleys may be susceptible to water back up along the top of the cut off shingles in the valley if not properly trimmed potentially causing roof leaks. 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 roof is on a small cabin in the back of beyond and the only valleys will be on 3 small dormers with about 6 feet of valley per side so i m not sure the water will wear out the valley shingles argument will work.

Closed valleys are very vulnerable to mechanical damage. Roofing material manufactures or roofing associations may have recommended installation guidelines for their products or for various roofing materials. 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. 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.

Essentially there are three main ways to shingle a roof valley. As for cost closed cut valleys are the way to go. On a closed valley roof the shingles extend to the valley area completely closing it off. The metal is usually pre painted to best complement the shingles color blend.

Closed valleys may have a tendency if not constructed properly to channel water under the shingles laid over the bottom layer of shingles. The open valley looks like each plane of the roof was cut in separate and the eye is drawn to the separation. If you like exposed metal especially if you use copper you may want to pick open. We don t normally offer this line although it is available.

If you prefer a concealed valley lining and want your roof to blend together choose the closed valley. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks. It is always a good idea to check with the manufacturer or a certified installer of the product such as ourselves. Although the open valley is recommended by the manufacturer closed valley is acceptable.

Woven closed cut and open. An open valley has a gap usually about 6 inches between the tile or shingles at the valley area. The only type of valley that is unacceptable is the woven valley. A roof valley is formed where two roof slopes meet.

When it comes to aesthetics that is all up to preference. Water collects in a valley to flow off the roof.