In roof anatomy, the valley is the section where two adjoining roof planes meet. They create a “V” shape and make a natural path for rainwater and snowmelt to flow. In other words, valleys are some of the most vulnerable parts of the roof. They must be flashed properly in order to keep the substrate dry and in good condition.
Every honest roofing and siding contractor will tell you that there are two main ways to flash roof valleys: the closed method and the open method. Today, Classic Remodeling Corp. sheds light on them.
What Is the Difference Between the Two?
Basically, closed valleys are valleys that are covered with shingles. The valleys themselves may be indistinguishable from the ground since all parts of the roof planes consist of one roofing material of the same design.
On the other hand, open valleys are valleys covered with a layer of lining made of any metals that can stand up to weather. The shingles do not reach the valley area and are not nailed through the metal valley lining to prevent water leakage.
Either method, every reliable roofing company will opt to install a self-adhering underlayment over the entirely of the wood deck. This layer of protection shields the foundation of the roof from any drops of water that penetrate the valley.
Is One Better than the Other?
At the end of the day, it is all about preference. Open valleys are usually considered more aesthetically pleasing since the addition of a metallic element brings more character to the roof. Closed valleys are generally less costly, for shingles are much affordable than pieces of metal.
When it comes to functionality of both valley construction types, roofing and siding professionals tend to have different opinions about them. Seek advice from a contractor you can trust.
Let Classic Remodeling Corp. demystify all things roof replacement for you. Call us at (201) 487-1666 or fill out our contact form to set up an appointment with us. We serve clients in Hackensack and Paramus, NJ.