The Importance of Re-felting Tile Roofs in Phoenix, Arizona

Tile roofs are one of the most popular roofing systems in Phoenix, Arizona and for good reason. They’re durable, energy-efficient, and built to withstand the intense desert climate. However, what many homeowners don’t realize is that the tiles themselves are not the primary waterproofing layer.

The real protection lies beneath the tiles in the underlayment, often referred to as “felt.” Over time, especially in Phoenix’s extreme conditions, this underlayment deteriorates and requires replacement. This process is known as refelting.

What Is a Roof Refelt?

Roof refelting involves removing the existing tiles, replacing the worn or damaged underlayment, and then reinstalling the tiles. While the tiles may last decades, the underlayment beneath them has a much shorter lifespan.

In a tile roofing system, the underlayment acts as the true waterproof barrier, protecting the structure of the home from moisture intrusion.

Why Refelting Is Especially Important in Phoenix

Extreme Heat and UV Exposure

Phoenix is known for its intense summer temperatures, often exceeding 110°F. Prolonged exposure to heat and ultraviolet radiation causes roofing materials to dry out, crack, and lose effectiveness over time. Underlayment is particularly vulnerable to this kind of degradation.

Monsoon Storms and Sudden Rainfall

Although Phoenix is a dry climate, the monsoon season brings intense bursts of rain, wind, and debris. If the underlayment is compromised, even a short storm can lead to leaks, water damage, and costly repairs inside the home.

Tile Roofs Can Hide Underlying Issues

One of the unique challenges with tile roofs is that they often appear to be in good condition from the outside. Cracked or deteriorated underlayment is hidden beneath the tiles, meaning problems can go unnoticed until interior damage becomes visible.

How Long Does Underlayment Last?

While tile roofs can last 40–50 years or more, underlayment typically lasts:

• 15–20 years for traditional felt

• 20–25 years for synthetic materials

In Phoenix’s climate, these timelines can be shortened due to constant heat exposure. Homeowners with roofs older than 15 years should consider having their roof inspected.

Signs Your Roof May Need Refelting

• Water stains on ceilings or walls

• Musty odors in the attic

• Loose or shifting tiles

• Visible debris beneath tiles

• Roof age exceeding 15–20 years

Even if none of these signs are present, aging underlayment can still pose a risk.

The Refelting Process

Refelting is a detailed process that typically includes:

1. Carefully removing and stacking existing tiles

2. Removing the old underlayment

3. Inspecting and repairing the roof deck if needed

4. Installing new underlayment

5. Reinstalling the original tiles

This process restores the functionality of the roof without requiring a full replacement of the tile system.

Preventative Maintenance vs. Costly Repairs

Delaying refelting can lead to more significant issues, including:

• Structural wood damage

• Mold growth

• Interior drywall and insulation damage

• Full roof replacement

Addressing underlayment issues early is generally far more cost-effective than repairing extensive damage later.

Final Thoughts

Tile roofs are designed for longevity, but they rely heavily on the condition of the underlayment beneath them. In a climate like Phoenix, where heat and sudden storms put constant stress on roofing systems, refelting is a critical part of long-term home maintenance.

Regular inspections and timely refelting can help protect your home, extend the life of your roof, and prevent unexpected repair costs.

Schedule an inspection if you are unsure of the condition of your underlayment and Kaizen will be more than happy to assist you with your current or future needs!