How Long Does Roofing Felt Last Under Tiles

November 29, 2025

2 min read

Roofing felt under tiles typically lasts 20 to 30 years, depending on the climate, ventilation, and quality of installation. This underlayment layer acts as a barrier to protect your roof from water damage and wind. However, felt degrades faster in hot, humid climates and can fail sooner if your attic lacks proper airflow. Most homeowners need to replace felt when they replace their tile roof, which happens on average after the roof reaches about 19 years old. According to RubyHome, the average age of roofs being replaced is just over 19 years, making felt replacement a common part of roof maintenance.

What Makes Roofing Felt Wear Out?

Heat, moisture, and sunlight break down roofing felt over time. Felt is made from paper or fiberglass soaked in asphalt, so extreme temperatures cause the material to become brittle and crack. Poor ventilation in your attic traps hot air against the felt, which speeds up deterioration.

Tree debris, moss, and algae also damage felt. When gutters stay clogged, water backs up onto the felt and causes rot. In humid climates like Florida or the Southeast, felt fails much faster because moisture never fully dries.

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How Do You Know If Your Felt Needs Replacement?

Water spots on your ceiling are the first warning sign. You may also see sagging areas in your roof or notice leaks during heavy rain. According to industry data, leaking is the reason 33% of homeowners replace their roofs.

If your roof is older than 20 years, have a professional inspect the felt. They can spot damage from the attic side. Many roofers recommend a professional inspection at least once per year, especially after major storms.

Material Lifespan Comparison

Different underlayment materials last different lengths of time. Here is what you need to know:

Underlayment Type	Typical Lifespan
Traditional roofing felt	15-20 years
Synthetic underlayment	25-50 years
Rubberized asphalt	20-30 years
Asphalt shingles (with felt)	20-30 years

Synthetic underlayment costs more upfront but lasts much longer and resists moisture better. According to industry data, asphalt architectural shingles last about 30 years, and the felt underneath typically wears out around the same time.

Why Replace Felt When You Replace Your Roof?

Replacing felt during a full roof replacement is cost-effective. You already have roofers on the job, so labor costs are lower. Old felt that stays behind can trap moisture and cause wood rot in your roof structure.

According to RubyHome, roof replacement costs range from $5,868 to $13,217 on average. Including new felt in this project adds minimal expense compared to fixing rot damage later. Storm damage causes 33% of roof replacements, making fresh underlayment especially important after severe weather.

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If you need help with your roof, reach out to a trusted professional roofer for clear pricing and reliable service.