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. 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. If you like exposed metal especially if you use copper you may want to pick open. 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. Woven closed cut and open.

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. On a closed valley roof the shingles extend to the valley area completely closing it off. If you prefer a concealed valley lining and want your roof to blend together choose the closed valley. Closed valleys may have a tendency if not constructed properly to channel water under the shingles laid over the bottom layer of shingles.

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. Open valley roofs what s the difference between a closed and open valley roof. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks. We don t normally offer this line although it is available.

It is always a good idea to check with the manufacturer or a certified installer of the product such as ourselves. The only type of valley that is unacceptable is the woven valley. As for cost closed cut valleys are the way to go. A closed valley is where the tiles or shingles are butted up against each other in the center of the valley.

Closed valleys are very vulnerable to mechanical damage. The open valley looks like each plane of the roof was cut in separate and the eye is drawn to the separation. Although the open valley is recommended by the manufacturer closed valley is acceptable. Essentially there are three main ways to shingle a roof valley.

An open valley has a gap usually about 6 inches between the tile or shingles at the valley area. A roof valley is formed where two roof slopes meet. For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck. 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.

When it comes to aesthetics that is all up to preference. The metal is usually pre painted to best complement the shingles color blend.