One question homeowners rarely think to ask is: What is a roof valley and why does it matter?
A roof valley is the area where two slopes of a roof meet and form a channel that directs water down the roof and into the gutter system. Because valleys collect and move large amounts of rainwater, they are one of the most important and most vulnerable areas of a roofing system.
For homes in Edwardsville, IL, where heavy rainstorms and seasonal weather are common, properly installed roof valleys are essential for protecting the home from leaks and water damage.
At Barringer Brothers Roofing, roof valleys are one of the key areas we evaluate during every roof inspection because problems in valleys are a frequent cause of roof leaks.
Why Roof Valleys Are So Important
A roof valley handles more water flow than almost any other area of the roof.
When rain hits the roof, water naturally flows downward and gathers in the valleys before draining toward the gutters.
Because of this, valleys must be carefully installed with proper materials and flashing to prevent water from penetrating the roofing system.
If a roof valley is damaged or improperly installed, it can lead to:
• Roof leaks
• Water damage inside the home
• Rotting roof decking
• Premature roof deterioration
This is why roof valleys are a major focus during professional roof inspections and roof repair evaluations.
How Roof Valleys Are Installed
A properly installed roof valley typically includes several protective layers.
These may include:
• Ice and water shield underlayment
• Metal valley flashing
• Properly woven or cut shingles
• Correct sealing techniques
Each layer helps guide water safely down the valley and away from vulnerable areas of the roof.
Professional installation ensures water cannot work its way underneath the shingles.
Signs Your Roof Valley May Need Attention
Because valleys handle so much water, they often show signs of wear earlier than other parts of the roof.
Some common warning signs include:
• Shingles lifting or curling near the valley
• Missing or damaged shingles
• Dark staining or uneven wear
• Leaks appearing after heavy rain
• Granules collecting near valley areas
If you notice any of these signs, it may be time to schedule a roof inspection.
Early detection can help prevent larger structural problems.
How Storms in Edwardsville Can Impact Roof Valleys
Homes in the Metro East region regularly experience strong storms with heavy rain and high winds.
These conditions place additional stress on roof valleys, especially if the roof is older or nearing the end of its lifespan.
Wind can loosen shingles near the valley, while heavy rain can expose weak spots in the roofing system.
After major storms, many homeowners schedule a storm damage roof inspection to check vulnerable areas like valleys, flashing, and roof vents.
When a Roof Valley Problem May Require Roof Replacement
Sometimes valley issues can be repaired, especially if the damage is limited to a small area.
However, if the roof is older or shows widespread wear, a roof replacement may be the best long-term solution.
Replacing the roof allows contractors to install updated underlayment, flashing, and ventilation systems that improve the durability of the entire roofing system.
A professional roofing contractor can help determine whether roof repair or roof replacement is the best option.
Professional Roofing Services in Edwardsville, IL
Barringer Brothers Roofing provides residential roofing services for homeowners throughout the Metro East area.
Our services include:
• Roof inspections
• Roof repair
• Roof replacement
• Storm damage inspections
• Gutter installation
• Siding services
Our team carefully evaluates key areas of the roof — including valleys, flashing, vents, and shingles — to ensure your home stays protected year-round.
Schedule a Roof Inspection in Edwardsville, IL
If you’re concerned about the condition of your roof or have noticed signs of wear around roof valleys, a professional inspection can help identify potential problems early.
📞 Call Barringer Brothers Roofing at (618) 703-3036 to schedule a roof inspection.
You can also visit our website and fill out our contact form to request an estimate or inspection.
Barringer Brothers Roofing proudly serves homeowners in Edwardsville, Belleville, Glen Carbon, Maryville, Troy, and surrounding Metro East communities.
