Roof valleys are one of the most important structural and drainage features in any roofing system. Because they handle some of the highest volumes of water runoff, valleys must be properly designed, sealed, and protected to prevent leaks and long-term damage.
At Providence Roofing, we pay special attention to roof valleys because they are one of the most vulnerable areas on any roof and one of the most critical for overall performance.
A roof valley is the intersection where two sloping roof planes meet, forming a V-shaped channel. This channel directs rainwater and melting snow down toward the gutters and away from the roof system.
Roof valleys are common on homes with complex roof designs, such as:
Any roof with multiple angles will likely have one or more valleys.
The primary function of a roof valley is water management. Valleys serve as the main pathway for runoff when rain flows down two roof slopes at once. Because they collect and carry concentrated water, valleys must be built to handle heavy flow efficiently.
Key functions of roof valleys include:
Without properly installed valleys, the risk of roof leaks increases significantly.
Roof valleys are located at the internal angles of a roof where two sections slope inward toward each other. They are typically found:
Because valleys receive constant water flow, they are among the first areas to show signs of wear or damage.
There are several methods for constructing roof valleys, depending on the roofing material and design needs.
In an open valley, the valley area is lined with metal flashing, and shingles are cut back to expose the flashing. This design allows water to flow freely and is highly effective in heavy rain conditions.
In a closed valley, shingles cover the valley area completely, creating a seamless look. While visually appealing, closed valleys require precise installation to remain watertight.
In woven valleys, shingles from both roof planes overlap and interweave through the valley. This method provides strong coverage but is typically used with asphalt shingles only.
At Providence Roofing, we determine the best valley system based on roof type, slope, and weather demands.
Because valleys handle concentrated runoff, they experience more wear than other roof areas. Leaves, debris, and standing moisture can collect in valleys, increasing the chance of damage.
Common valley-related issues include:
Routine inspections are especially important for roofs with multiple valleys.
Roof valleys require extra waterproofing layers, including underlayment and flashing, to ensure long-term protection. Proper installation involves correct shingle alignment, sealing, and drainage planning.
At Providence Roofing, we treat valleys as one of the most critical parts of the roof system. Our team ensures every valley is built to withstand heavy rain, storms, and years of exposure without compromising performance.
Roof valleys may be just one section of the roof, but they play a major role in keeping your home protected, dry, and structurally sound.
