Why Your Roof’s Underlayment Matters During Phoenix’s Monsoon Season

When the monsoons roll into Phoenix each summer, they don’t come quietly. From sudden downpours to fierce wind gusts and dust storms, monsoon season (typically June through September) puts roofs to the test. And while most homeowners focus on visible shingles or tiles, it's the roof underlayment—the hidden protective layer—that often makes the biggest difference in safeguarding your home.

What Is Roof Underlayment?

Roof underlayment is the water-resistant or waterproof barrier installed directly onto your roof deck, underneath your tile or shingles. It serves as the last line of defense against water infiltration. In places like Phoenix, where many homes feature tile roofs, the underlayment is especially important because tile alone is not watertight.

Why Underlayment Is Critical During Monsoon Season

During monsoons, Arizona roofs face:

• Heavy Rain: Fast-moving storms can dump inches of rain in minutes.

• High Winds: Gusts strong enough to shift tiles or lift shingles.

• Debris Impact: Flying branches or blown-off roofing materials.

• Sudden Temperature Drops: Creating expansion and contraction stress on materials.

If your underlayment is compromised—cracked, torn, or aged past its prime—your home is vulnerable to leaks, water damage, mold, and costly repairs.

Signs Your Underlayment May Need Replacement

• Your tile roof is over 20 years old

• You’ve noticed interior water spots or musty odors

• Missing, cracked, or slipped tiles

• You see visible wear on your eaves or attic rafters

• Past repairs were done without replacing underlayment

Even if your roof looks “fine” from the street, the real story is hidden beneath the surface.

Phoenix Homes Need Monsoon-Ready Roofs

Phoenix’s unique desert climate means your roof needs to endure both scorching summer sun and sudden seasonal storms. Quality underlayment acts like a waterproof shield—working behind the scenes to keep your home dry and protected during every monsoon event.

Trust CDL Roofing for Monsoon Protection

At CDL Roofing, we’ve been helping Phoenix and Scottsdale homeowners protect their properties for over 25 years. Whether you need a full underlayment replacement, storm-related repairs, or a free inspection to assess the health of your roof, our expert team is ready to help.

We specialize in tile roof systems, understand Arizona's building codes, and have completed hundreds of successful underlayment replacements in communities across the Valley.

Don’t Wait for the Rain to Reveal the Damage

Be proactive. Call CDL Roofing at (602) 802-8795 or visit www.cdlroofing.com to schedule your free roof inspection today. Make sure your roof—and the underlayment beneath it—is ready for whatever this monsoon season brings.