A tile roof can last for decades, but the tile itself is only one part of the roofing system. Underneath the tile is the underlayment—the waterproofing layer that helps protect your home from leaks.

For homeowners in Orange County and throughout Southern California, one of the most important questions is:

Does my tile roof need routine maintenance, or is it time to replace the underlayment?

The answer largely depends on the age of the roof, the condition of the underlayment, and how much wear and activity the roof receives.

If Your Tile Roof Is 20 Years Old or Younger

If your tile roof is relatively young and the underlayment is still in good condition, regular maintenance and inspections can help extend the life of the roofing system.

In general, tile roofs should be professionally inspected and maintained every 1–3 years, depending on the conditions surrounding the home.

Annual maintenance may be appropriate if your roof has:

• Heavy tree shedding or debris

• Trees overhanging the roof

• Frequent debris buildup

• Golf ball impacts or other repeated damage

For roofs without these conditions, maintenance approximately every 3 years may be appropriate.

What Should Tile Roof Maintenance Include?

A proper tile roof maintenance service should include checking and addressing:

• Broken or cracked tiles

• Slipped or displaced tiles

• Missing or deteriorated mortar

• Roof pipe penetrations

• Debris in valleys and around chimneys

• Gutters and downspouts

Replacing a broken tile or repairing deteriorated mortar may seem like a small repair, but addressing these issues early can help prevent water from reaching the roofing system underneath.

Regular maintenance is not a guarantee against leaks, but it can help prevent many common roofing problems and preserve the life of the roof.

When Is It Time to Replace the Underlayment?

This is where the age of the roof becomes particularly important.

Many older Orange County homes were originally built with one layer of 30-pound asphalt-saturated felt, commonly called "felt" or "paper" in the roofing industry.

This material typically has a useful life of approximately 20–25 years.

As it ages, the underlayment can become dry, brittle, fragile, and easier to tear apart.

This creates an important distinction:

Your tile may still look good even though the waterproofing underneath it has reached the end of its useful life.

If your tile roof is more than 25 years old and the original underlayment has never been replaced, we recommend having the roofing system professionally evaluated to determine whether underlayment replacement is appropriate.

Why Older Tile Roofs Require Extra Care

When an older underlayment becomes brittle, unnecessary foot traffic can cause damage.

Someone who is not trained in properly walking on tile can break or move tiles and potentially damage the fragile underlayment underneath. Once that waterproofing layer is compromised, water can enter the roofing system.

That's one reason homeowners should avoid allowing untrained individuals to walk on an older tile roof.

What Is a Tile Relay or Tile Reset?

Replacing the underlayment beneath an existing tile roof is commonly called a tile relay or tile reset.

Rather than automatically replacing the entire tile roof, the existing tile can often be carefully removed and reused if it is still serviceable.

A tile relay typically involves:

• Removing the existing, expired underlayment

• Inspecting the roof deck

• Replacing damaged wood

• Installing new underlayment

• Replacing deteriorated flashing

• Replacing outdated roof vents where needed

• Reinstalling suitable existing tile

For properties in Southern California fire-prone areas, roofing components may also need to meet applicable Class A fire and ember-resistance requirements, depending on the property's location and current building codes.

A tile relay is a significant roofing project and generally involves city permitting and inspections.

Maintenance or Underlayment Replacement?

A simple way to think about it:

Roof ConditionTypical ApproachUnder 20 years old and in good conditionRoutine maintenanceHeavy trees, debris or golf ball exposureMore frequent maintenance20–25 years oldHave underlayment evaluatedOver 25 years old with original underlaymentEvaluate for tile relay/resetBrittle, deteriorated underlaymentUnderlayment replacement may be needed

Don't Judge an Older Tile Roof by Its Appearance Alone

One of the biggest misconceptions about tile roofs is that if the tile still looks good, the roof must be good.

That's not necessarily the case.

The tile may remain serviceable for many more years while the original underlayment underneath has already deteriorated.

That's why the age and condition of the underlayment are just as important as the appearance of the tile.

KJC Roofing, Inc. Can Help

At KJC Roofing, Inc., we provide tile roof maintenance, repairs, inspections, and tile relay/reset services throughout Orange County and Southern California.

If your tile roof is approaching or past 25 years old, don't wait until a leak tells you the underlayment has failed.

We can evaluate the condition of your roofing system and help determine whether you need routine maintenance, repairs, or a complete underlayment replacement.

KJC Roofing, Inc. — Protecting your home from the top down.