The valleys – the area where roof planes intersect – are the weak points of a conventional roofing system, which is why you need to pay attention to them.
Why the Valley Is the Most Vulnerable Part of Your Roof
The valley area handles a large amount of run-off water. Before water is diverted to the edges of your roof and into the gutters, it has to pass through the valley area. To prevent water from seeping into the roof’s underlayers, contractors install flashing in the valley area. Depending on the method of flashing, the valley area is classified as either a closed or an open valley.
Closed vs. Open Valley Roofs
What’s the difference between a closed and open valley roof? On a closed valley roof, the shingles extend to the valley area, completely closing it off. Meanwhile, on an open valley roof, the metal lining that prevents water from seeping into the underlayers is left exposed.
Which Is Better?
It depends on your needs and preferences. Designwise, an open-valley roofing system would be probably more appealing. The exposed metal lining can serve as an architectural feature on your roof. The metal lining is usually made from galvanized steel or aluminum, but if you want to maximize your roof’s aesthetic appeal, choose copper.
Keep in mind that closed valley roofs also have their advantages in terms of aesthetics. For instance, the covered valley area allows the roof planes to blend together, creating a uniform look for your roof.
In terms of function, both options do a satisfactory job in protecting your roof. However, improper installation can cause roofing issues. For instance, open valleys may be susceptible to water backups if they’re not trimmed properly while closed valleys may channel water under the shingles if they’re not constructed properly. That’s why it’s important that you hire a qualified roofer for the job.
Willi Roofing Services offers a wide range of professional roofing services. To get a free estimate, call us at (512) 394-8234, or fill out this form. We serve homeowners in Round Rock, TX, as well as the surrounding communities.
