What Florida Homeowners Should Know About Roof Underlayment

Roof underlayment is a critical yet often unseen component of a roofing system. Installed over the roof deck and beneath shingles, tiles, or metal panels, it serves as a secondary barrier against water intrusion.

This added protection is essential in Florida, where heavy rain and strong winds can drive water beneath the roof covering, even if tiles or shingles seem undamaged. If roofing materials are cracked, lifted, or displaced during a storm, properly installed underlayment helps limit water intrusion to the roof deck and interior.

There are several types of roof underlayment. Traditional asphalt-saturated felt has long been used, while synthetic options are lighter and more tear-resistant. Self-adhered underlayments bond directly to the roof deck and offer enhanced protection against wind-driven rain. The best choice depends on the roofing material, roof design, manufacturer specifications, building codes, and property requirements.

Underlayment is especially important beneath tile roofs. Concrete or clay tiles provide the visible surface but are not the sole barrier against water. Rain can penetrate beneath tiles through gaps, overlaps, or wind pressure. The underlayment channels this moisture toward the roof edge before it reaches the decking.

Even high-quality underlayment can fail if installed improperly. Seams, fasteners, valleys, penetrations, flashing, and transitions require careful attention. The roof deck must be clean, properly prepared, and repaired as needed before installation.

Since underlayment is hidden once the roof covering is installed, homeowners should ask which product is proposed, why it is suitable, and what warranty is offered. The lowest-priced option may not deliver the best long-term value in Florida’s challenging climate.

Packard Roofing & Waterproofing, Inc. has served Florida homeowners for over 55 years. Our experienced team can explain the entire roofing system, not just the visible materials, and help Treasure Coast homeowners make informed decisions.