A valley refers to the internal angle formed where two slopes of a roof meet. Valleys are typically found in residential and commercial roofing systems where the roof has two slopes that meet at an angle, such as in gable, hip, and gambrel roof designs.
The valley is a critical component of the roof, as it serves as a pathway for water to flow off the roof and into the gutters or downspouts. Without a properly constructed valley, water can accumulate on the roof, leading to water damage, leaks, and other problems that can compromise the integrity of the building structure.
There are several different types of valleys that can be used in roofing systems, depending on the design and construction of the roof. Some of the most common types of valleys include:
Closed valley: A closed valley is a type of valley where shingles or other roofing materials are installed over the valley, creating a solid, continuous surface that prevents water from entering the roof system.
Open valley: An open valley is a type of valley where metal flashing is used to create a channel that directs water off the roof and into the gutters or downspouts.
Woven valley: A woven valley is a type of valley where shingles or other roofing materials are alternated in a weaving pattern to create a channel that directs water off the roof and into the gutters or downspouts.
Proper installation and maintenance of valleys are essential to ensure the long-term health and integrity of the roof. Valleys must be properly constructed, flashed, and sealed to prevent water from entering the roof system and causing damage. Regular maintenance and inspection of valleys can help to identify and address any issues before they become more serious problems.
Roof Valley 101: Top 5 FAQs Answered for Homeowners
Valleys are prone to leaks due to the concentration of water and debris in these areas. If the valley is not properly flashed or sealed, water can infiltrate the roof system, leading to damage and leaks.
Valleys are typically formed by joining two roof sections at an angle, forming a “V” shape. The valley is then covered with a specialized flashing or underlayment material to prevent water penetration.
Valley flashing should be inspected at least once a year, as well as after any major storm or weather event. Any signs of damage or wear should be repaired promptly to prevent water infiltration.
The extent of damage to the valley will determine whether it can be repaired or needs to be replaced. Minor damage may be repaired, but more significant damage or deterioration may require replacement.
To prevent leaks in roof valleys, it’s important to have them installed properly by a qualified roofing professional. Regular inspection and maintenance of the valley flashing, as well as prompt repair of any damage, can also help prevent leaks. Additionally, keeping the roof and gutters clear of debris can help prevent water from pooling in the valleys.