At Barringer Brothers Roofing, we often hear homeowners talk about “getting a new roof,” but a roofing system is much more than the shingles you see from the street. Every component works together to protect your home from moisture, wind, and changing Southern Illinois weather.
Whether you’re building a new home or replacing an aging roof in Alton, IL, understanding what makes up a complete roofing system can help you make more informed decisions about your investment.

Roof Decking Provides the Foundation
Everything begins with the roof decking.
Roof decking creates the solid surface that supports the rest of the roofing system. Before installing a new roof, the decking should always be inspected to ensure it is structurally sound.
Without a strong foundation, even the highest-quality roofing materials cannot perform as intended.
Underlayment Adds Another Layer of Protection
After the roof decking comes the underlayment.
This protective barrier helps prevent moisture from reaching the decking if water ever gets beneath the shingles during severe weather.
It’s one of the most important components of a long-lasting roofing system.
Flashing Helps Prevent Leaks
Flashing is installed around roof penetrations and transitions, including:
- Chimneys
- Plumbing vents
- Roof valleys
- Skylights
- Wall intersections
Proper flashing directs water away from vulnerable areas and helps prevent leaks over the life of the roof.
Architectural Shingles Protect Your Home
Architectural shingles are the most visible part of the roofing system.
They’re a popular choice because they offer:
- Long-lasting durability
- Excellent curb appeal
- Multiple color options
- Strong wind resistance
- Great long-term value
When installed correctly, they provide dependable protection while enhancing your home’s appearance.
Ventilation Matters More Than Many Homeowners Realize
Proper attic ventilation helps regulate temperature and moisture inside your attic.
A balanced ventilation system can help:
- Reduce excess heat
- Minimize moisture buildup
- Extend roof lifespan
- Improve energy efficiency
Ventilation is an important part of every complete roofing system.
Quality Installation Brings Everything Together
Even premium roofing materials depend on proper installation.
A complete roofing system only performs as intended when every component is installed correctly. That’s why choosing an experienced roofing contractor is just as important as choosing quality materials.
Why Homeowners Choose Barringer Brothers Roofing
Since 2004, Barringer Brothers Roofing has proudly served homeowners throughout Alton and the Metro East with professional roof installations, roof replacements, roof repairs, inspections, storm damage restoration, siding, and gutters.
We’re proud to have earned more than 200 5-star reviews by providing honest recommendations, dependable service, and quality workmanship on every project.
Whether you’re building a new home or replacing an older roof, we’re committed to installing complete roofing systems designed to protect your investment for years to come.
Frequently Asked Questions
A complete roofing system includes the roof decking, underlayment, flashing, shingles, ventilation, ridge caps, and other components that work together to protect your home.
No. Shingles are only one component. A roof also relies on decking, underlayment, flashing, ventilation, and other materials for long-term performance.
Flashing helps direct water away from roof penetrations and transitions to reduce the risk of leaks.
Proper ventilation helps reduce heat and moisture buildup, improving roof performance and extending its lifespan.
Professional installation helps ensure every part of the roofing system works together to provide lasting protection.
Contact Barringer Brothers Roofing
Need a new roof in Alton, IL?
Barringer Brothers Roofing installs complete roofing systems designed for long-lasting performance and curb appeal. Whether you’re building a new home or replacing an existing roof, our experienced team is here to help.
📞 Call (618) 703-3036 or fill out our online contact form to schedule your free estimate today.