Open Or Closed Roof Valley Better

The metal is usually pre painted to best complement the shingles color blend.

Open or closed roof valley better.

However a closed system simply performs better. Closed roof valleys are also more affordable as installing a metal lining costs extra. The only type of valley that is unacceptable is the woven valley. The shingles will act as the valley lining and will protect the roof deck and underlayment against water run off.

It is always a good idea to check with the manufacturer or a certified installer of the product such as ourselves. It might cost a little more in materials around 150 500 on average depending on the home and material. The closed cut valleys are cheaper and commonly done in my area but they tend to wear out sooner due to the high volume of water in the valley washing away the protective grit on the shingles there before on the rest of the roof. That said an open roof valley is a good option if you want to the metal strip to serve as an architectural detail on the roof.

For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck. When installing an open valley the roofing company will add another layer of lining to the roof valley. Open valleys may be susceptible to water backup if the cut off shingles are not properly trimmed potentially causing roof leaks. I m leaning towards an open metal valley but i ve had contractors disagree saying that the metal expands and contracts too much.

Although the open valley is recommended by the manufacturer closed valley is acceptable. I kind of prefer the look of the closed valley. 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 it is said that provided the rest of the roofing shingles were properly installed and are performing properly open valleys will perform better over time than closed valleys.

The open valley looks like each plane of the roof was cut in separate and the eye is drawn to the separation. Architects often prefer closed valleys to open valleys as they feel that it gives a home better architectural appeal. They ll then install the shingles onto the roof deck extending them through the valley. After covering the roof with underlayment they ll then install a pre bent metal valley.

Thus closed roof valleys extend the time between your roof repair projects. Roofers on the other hand often prefer an open valley because they feel it is more practical. When installing a closed valley the roofer will cover the roof with underlayment. The reason that many roofers like an open valley is that they feel that tree leaves and needles will more easily slide down or wash down an open valley when it rains.