Most homeowners think of their roof as just shingles. But a proper roofing system includes multiple layers—each with a specific purpose designed to protect your home, improve energy efficiency, and extend the lifespan of your roof.
At Finley’s Roofing, we believe in educating our customers, so you understand exactly what you’re paying for. If you’re considering a new roof—or wondering what’s up there keeping your home safe—this guide is for you.
🧱 Why Your Roofing System Is More Than Just Shingles
A roof is more than what you see from the curb. It’s a layered system that works together to:
- Prevent water intrusion
- Reduce energy loss
- Resist wind, debris, and hail
- Ventilate and protect your attic
- Support the weight of roofing components
When installed correctly, these layers work in harmony to protect your home from Georgia’s unpredictable weather—including heat, humidity, thunderstorms, and even the occasional winter freeze.
🔍 The 7 Core Components of a Roofing System (Explained)
Let’s break down the major layers of a professional roofing system—and why each one matters.
1. Roof Decking (aka Sheathing)
This is the foundation of your roof—the flat panels that cover the frame of your home. Usually made of OSB (oriented strand board) or plywood, the decking supports the weight of shingles and provides a surface to fasten everything securely.
⚠️ Problems If Decking Fails:
- Sagging rooflines
- Shingles not holding fast
- Soft spots underfoot
- Water intrusion into the attic
At Finley’s Roofing, we inspect all decking during roof replacement and replace any damaged panels before installing new materials.
2. Ice & Water Shield (Leak Barrier)
This is a self-sealing membrane installed along the most leak-prone areas of your roof: valleys, chimneys, dormers, skylights, and eaves.
Benefits:
- Prevents wind-driven rain from getting underneath shingles
- Offers protection during freeze/thaw cycles (yes—even in Georgia!)
- Helps seal around nails and roof penetrations
Think of this layer as your roof’s insurance policy against leaks in critical spots.
3. Synthetic Underlayment
This water-resistant layer covers your entire roof decking before shingles go on. It provides a second line of defense in case water slips past the shingles.
Why It Matters:
- Repels moisture
- Lies flat and doesn’t wrinkle like felt paper
- Offers added protection in high-wind storms
- Breathable to reduce trapped moisture
At Finley’s Roofing, we use GAF Tiger Paw™ or Deck-Armor™ synthetic underlayment—products designed for maximum durability and protection.
4. Starter Strip Shingles
These are installed along the eaves and rakes of your roof. They’re not just a base layer—they’re crucial for wind resistance and waterproofing.
What They Do:
- Seal the roof edges
- Prevent shingles from blowing off in storms
- Allow for clean, straight rows of shingles
Starter strips also activate the manufacturer’s wind warranty when installed properly as part of the GAF system.
5. Shingles (The Outer Shell)
Shingles are the part you see—but also the first layer of protection from the elements. At Finley’s Roofing, we proudly install GAF Timberline HDZ® architectural shingles, which are engineered to last longer and perform better than standard 3-tab options.
GAF Timberline HDZ® Benefits:
- LayerLock™ Technology for a stronger bond
- Wind resistance up to 130 mph
- Algae protection with StainGuard Plus™
- Available in dozens of colors to match your home
Unlike cheaper shingles, these are built to handle Georgia’s heat, humidity, and storms—without curling, fading, or tearing.
6. Flashing
Flashing refers to the metal pieces installed around vulnerable roof transitions—such as chimneys, skylights, wall joints, and roof valleys.
What Flashing Does:
- Directs water away from seams
- Prevents leaks at intersecting surfaces
- Works with underlayment to protect corners and joints
We install flashing that’s properly cut, sealed, and integrated with your roofing system—no shortcuts, no guesswork.
7. Ridge Caps and Ventilation
The highest point of your roof needs special treatment. Ridge caps provide a finished look and added protection, while ventilation helps regulate attic temperature and moisture.
The Two Types:
- Ridge Cap Shingles: Specialized caps that cover the ridgeline with added thickness and wind resistance.
- Ridge Vents / Soffit Vents: Let hot, humid air escape the attic, reducing mold risk and lowering energy bills.
Poor ventilation is one of the biggest causes of premature roof failure in Georgia due to trapped heat and moisture. We ensure every roof breathes properly.
🌤️ Why Each Layer Matters in Georgia’s Climate
Georgia homeowners face a mix of roofing threats:
- High UV exposure from long summers
- Heavy thunderstorms with wind and hail
- Occasional snow and freeze-thaw damage
- High humidity that promotes mold and algae
Without a complete roofing system, these elements will wear your roof down faster, void warranties, and lead to leaks or structural problems. That’s why every layer above must be properly installed, sealed, and ventilated.
🛠️ Why a Complete System Is Better Than “Just Shingles”
Some roofing companies offer a basic “tear-off and re-shingle” approach—ignoring underlayment, flashing, ventilation, or even damaged decking. This leads to:
- Shortened lifespan
- More frequent repairs
- Denied manufacturer warranties
- Leaks that return months later
At Finley’s Roofing, we never cut corners. We install the entire GAF Lifetime Roofing System, ensuring:
- Maximum weather protection
- Valid manufacturer warranties
- Long-term performance
- Peace of mind
🏆 Why Choose Finley’s Roofing?
We’ve been installing roofs the right way in Georgia for over 83 years. As a GAF Master Elite® Certified Contractor, we’re among the top 3% of roofing companies nationwide with access to:
- Exclusive product lines
- Enhanced warranties
- Ongoing training and inspections
- Proven, factory-approved methods
Every project includes a dedicated project manager, clean job sites, and no payment until the job is done right.
📞 Want to Know What’s REALLY on Your Roof?
If your roof is aging, leaking, or you’re just not sure what shape it’s in, we’re here to help. Let us inspect your roofing system and walk you through exactly what’s working—and what’s not.