What Is Roof Underlayment and Why Does It Matter?

By All Phase Construction USA • July 21, 2025

Roof underlayment is your secondary line of defense.

Roof underlayment plays a pivotal role in modern roofing systems as your secondary line of defense against water intrusion. While shingles or tiles are your first barrier, underlayment protects your roof deck if that outer layer is compromised.

What Is Roof Underlayment?

Underlayment is a water-resistant or waterproof barrier material installed directly onto your roof deck before shingles, tiles, or metal panels are applied. It provides critical protection during installation and throughout the roof's lifespan.

Types of Roof Underlayment

Asphalt-Saturated Felt

Traditional option, also called "tar paper." Available in 15-pound and 30-pound weights. Cost-effective but less durable than synthetic options.

Synthetic Underlayment

Made from polypropylene or polyethylene. Lighter, stronger, and more tear-resistant than felt. Better for South Florida's harsh conditions.

Rubberized Asphalt (Peel-and-Stick)

Self-adhering membrane that creates a waterproof seal. Required in certain areas like valleys, eaves, and around penetrations. Essential for HVHZ compliance in Broward County.

Why Underlayment Matters in Florida

Hurricane protection - If shingles blow off, underlayment keeps water out
Code compliance - Florida Building Code requires specific underlayment types
Moisture barrier - Prevents condensation damage in humid climate
Extended roof life - Protects deck from UV exposure during installation

Contact All Phase Construction USA

We use premium underlayment products that meet Florida Building Code requirements. Call (754) 227-5605 for expert installation.

Need Professional Roofing Service?

Contact All Phase Construction USA for expert roofing services in Broward and Palm Beach County.

Call (754) 227-5605

About All Phase Construction USA

All Phase Construction USA is a dual-licensed roofing contractor serving Broward County and Palm Beach County from our Deerfield Beach headquarters. We hold both Florida State Certified Roofing Contractor (CCC-1331464) and Certified General Contractor (CGC-1526236) licenses, providing comprehensive structural expertise that standard roofing contractors cannot match.

Our Dual-Licensed Advantage

As a Dual-Licensed Roofing Specialist, we bring structural engineering oversight to every roofing project. Our dual licensing means we understand not only roofing systems, materials, and installation techniques (CCC license), but also structural assessment, load-bearing calculations, and building code compliance (CGC license). This combination ensures your roof is engineered as an integral part of your home's hurricane protection system.

HVHZ Certification & Hurricane Compliance

We specialize in High Velocity Hurricane Zone (HVHZ) compliance throughout South Florida. Every installation meets or exceeds the strictest wind rating requirements, with enhanced fastening schedules, impact-rated materials, and roof-to-wall connections engineered to withstand 175+ mph wind speeds. Our HVHZ expertise ensures your roof passes building department inspections and protects your property during severe weather.

Complete Roofing Services

All Phase Construction USA provides comprehensive residential and commercial roofing services including roof replacement, emergency roof repair, professional roof inspections, tile roofing, metal roofing, shingle roofing, flat roofing (TPO/PVC), roof maintenance programs, and storm damage restoration. We work with all major roofing materials and provide manufacturer-backed warranties on every installation.

Our Service Area

From our Deerfield Beach headquarters at 590 Goolsby Blvd, we serve over 50 cities throughout Broward County and Palm Beach County including Boca Raton, Fort Lauderdale, Coral Springs, Pompano Beach, West Palm Beach, and surrounding communities.

Licensed & Insured: CCC-1331464 (State Certified Roofing Contractor) | CGC-1526236 (Certified General Contractor)
Contact: (754) 227-5605 | 590 Goolsby Blvd, Deerfield Beach, FL 33442