Liquid Applied Roofing Systems

Performance Roofing & Impact Windows - Uncategorized - Liquid Applied Roofing Systems
May 28, 2025

Liquid-Applied Roofing & Waterproofing Systems

Liquid-applied roofing and waterproofing products provide a seamless, fully adhered membrane designed to protect roofs, balconies, decks, and other horizontal surfaces. These systems are versatile — used both as full roofing solutions and for targeted repairs. In this guide, we explore the most common types, their applications, and when they make the most sense for Florida properties.

What Are Liquid-Applied Roofing Products?

Liquid-applied roofing systems consist of resin- or asphalt-based materials that are rolled, sprayed, or brushed onto a substrate. Once cured, they form a seamless, flexible membrane that adapts to complex shapes and penetrations. Unlike traditional sheet-based systems, liquid products eliminate seams and joints — a common source of leaks.

Types of Liquid-Applied Systems

**Acrylic Coatings:**

Water-based and UV-resistant, acrylic coatings are ideal for roof restoration projects on metal or modified bitumen roofs. They’re highly reflective, which helps reduce cooling costs, but are less flexible in ponding water conditions.

**Silicone Coatings:**

Silicone is ideal for areas with frequent ponding water. It’s highly durable, UV-stable, and chemically resistant. It can be applied over existing roof systems with minimal prep and offers strong adhesion to many surfaces.

**Polyurethane Coatings:**

Polyurethane systems are solvent-based and offer excellent impact resistance. They perform well in high-traffic areas such as walk decks or service roofs. Available in single- or multi-component formats.

**Asphalt Emulsion & Roofing Cement:**

Asphalt-based coatings and mastics are often used for spot repairs, flashing tie-ins, or as a base layer in restoration systems. Roofing cement is thick and ideal for sealing around vents, pipes, or patched areas. It is not UV-stable without a protective coating or granules.

Full Roof Systems vs. Repairs

Liquid systems can be used in two ways:
  • **Full Restoration/Overlay:** These systems are applied over an entire roof — often a flat or low-slope roof — to extend life without a full tear-off. This process may include cleaning, reinforcing fabric, base coats, and topcoats.
  • **Spot Repairs:** Ideal for sealing penetrations, patching cracks, or protecting flashings. These products are often used in conjunction with other roofing systems to extend life or stop specific leaks.

Waterproofing Applications

Liquid-applied membranes are also used for:

  • **Balconies and Terraces**
  • **Foundation Walls**
  • **Roof Decks and Planters**
  • **Retaining Walls and Below-Grade Structures**
These products are designed to resist hydrostatic pressure and are often reinforced with embedded mesh or fabric to improve crack-bridging.

Advantages of Liquid-Applied Systems

  • Seamless and monolithic — no laps or joints
  • Conforms to irregular shapes, flashings, and penetrations
  • Lower installation impact compared to tear-off
  • Highly reflective (depending on formulation)
  • Can be recoated for ongoing maintenance
  • Some qualify for manufacturer warranties when installed as systems

Limitations & Considerations

  • Surface prep is critical for adhesion
  • Weather-dependent installation (dry, moderate temps)
  • Not all products are compatible with every substrate
  • May require multiple coats and curing time
  • Ponding water tolerance varies by product (acrylic vs. silicone)

Is Liquid-Applied Roofing Right for You?

Liquid systems are an excellent option for owners seeking an economical way to restore an aging flat roof, extend service life, or resolve flashing and waterproofing challenges. At Performance Roofing and Impact Windows, we specify these systems where appropriate and install them to meet code, manufacturer specs, and environmental conditions.
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