What underlayment is best for tile roofs?

What’s the Best Underlayment for Tile Roofs in Georgia?

For Georgia’s humid and storm-prone climate, the best underlayment for tile roofs is a double-layered waterproof system. Here’s what we recommend at Roof Nuts GA:

• Two-ply underlayment: One layer of Type II ASTM D226 or D4869 felt, followed by a second, overlapping layer. This setup provides a backup if the top layer is breached.

• High-temp, self-adhering membranes: Use these in critical areas like valleys, hips, ridges, and eaves where water flow is concentrated.

• Synthetic options: In some cases, durable synthetics rated for high temperature can be used across the field of the roof, provided they meet tile manufacturer specs.

Why it matters:

• Tile is durable, but not waterproof.

• Your underlayment is the real barrier protecting your home from leaks.

• Georgia's high humidity, rain, and storms demand better protection than a single layer of felt.

What do tile roofing codes say about underlayment?

Both the IRC (International Residential Code) and the Tile Roofing Industry Alliance (TRI) recommend at least two layers of underlayment under concrete and clay tiles in climates with moderate to high rainfall or freeze-thaw cycles.

In Georgia, while freeze-thaw isn’t a major concern, the heavy rain and roof slope requirements make this code guidance especially important.

FAQ

Q: Do tile roofs in Georgia need ice and water shield?
A: It’s not required by code in most of Georgia, but it’s a smart upgrade. Installing high-temp ice and water shield in valleys and along eaves gives added protection from wind-driven rain and ponding water.

Q: How long does tile roof underlayment last in Georgia?
A: Most standard felt underlayments last about 20 years, but high-quality synthetic or self-adhering options can last 30+ years, especially when properly installed under vented tile systems.

Q: Can you install tile roofing directly over old underlayment?
A: No. Old underlayment should be fully removed during a reroof. Tile roofs are long-term systems—starting fresh ensures the best protection and warranty coverage.

Want expert advice for your tile roof project in Atlanta, Macon, Augusta, or anywhere in Georgia?

📞 Call Roof Nuts GA at 404-476-6851 or schedule a free inspection today.

We specialize in custom tile roof installations and repairs for Georgia homes that need long-term protection with timeless curb appeal.