What Is Underlayment Replacement?
Underlayment replacement is the process of removing old, worn-out waterproofing material beneath tile roofs and installing a new barrier. While clay or concrete tiles can last 40–50 years, the underlayment beneath them often fails after 15–25 years in Arizona’s extreme climate.
Is It Really Necessary in Arizona?
Yes. Most Arizona homeowners are surprised to learn that their tile roof’s waterproofing system is not the tiles, but the underlayment. Once underlayment becomes brittle, torn, or rotted, water seeps into decking and causes expensive structural damage — even when tiles look fine from the street.
What’s Included in Underlayment Replacement?
-
Tile Removal: Carefully removing and stacking tiles for reuse.
-
Decking Inspection: Checking for rot, mold, or warped plywood.
-
New Underlayment Installation: High-performance synthetic or felt layers installed for waterproofing.
-
Tile Resetting: Tiles replaced and secured properly.
-
Flashing Updates: Reinforced seals at valleys, chimneys, and skylights.
Who Should Handle It?
Only experienced roofing contractors should handle underlayment replacement. Improper removal or resetting can crack tiles, void warranties, and lead to leaks.
When Should It Be Done?
Every 15–25 years, depending on your roof’s exposure and prior maintenance. Older tile roofs nearing 20 years almost always require underlayment replacement.
Why Does It Matter?
-
Saves Money: Prevents $30K+ in damage from water intrusion.
-
Extends Roof Life: Keeps tile roofs on track to last 40–50 years.
-
Improves Resale Value: Buyers seek roofs with updated underlayment.
-
Protects Insurance Claims: Maintains eligibility for storm damage coverage.
Key Facts at a Glance
| Item | Detail |
|---|---|
| Roof Type | Tile (clay/concrete) |
| Tile Lifespan | 40–50 years |
| Underlayment Lifespan | 15–25 years |
| Replacement Cost | Avg. $20K–$30K (New Tile + Underlayment) |
| Inspection Frequency | Every 5 years |
| Primary Risk | Underlayment failure, not tile breakage |
FAQ
Q: Can I replace just the tiles?
No — tiles are mostly cosmetic. The underlayment is what actually keeps water out.
Q: How do I know my underlayment is failing?
Signs include cracked tiles, interior leaks, or underlayment visibly deteriorating during inspection.
Q: Will I need new tiles too?
Not necessarily. Most tiles can be reused if carefully removed and reset.
Q: How long does underlayment replacement take?
A standard Arizona home usually requires 1–2 weeks, depending on roof size.
Bottom Line
Tiles are tough, but the underlayment beneath them is not. Proactive replacement keeps your roof performing for decades, protecting your investment and preventing catastrophic leaks.
Call Kore Roofing today at (480)-690-9949 or visit koreroofing.com to schedule a free tile roof underlayment inspection and experience The Kore Difference.
480-690-9949 or fill out the form below: