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Waterproofing Guides| Technical Specification

Liquid Applied vs. Torch-On: Which Waterproofing System is Superior?

The Seamless Advantage of Liquid Membranes

Liquid Applied Membranes (LAMs), particularly polyurethane systems, offer a fundamentally superior seal for complex flat roofs and structures. Unlike felt-based systems, LAMs cure to form a single, seamless, monolithic barrier. This eliminates the weakest point of any traditional system: the joins and overlaps.

  • Forms a single, monolithic, and joint-free barrier.
  • Adheres fully to substrates, reducing risk of water migration beneath the membrane.
  • Ideal for complex details like parapet walls, vents, and flashings where torch-on often fails.

The Trade-offs of Torch-On Systems

Torch-On Systems (bituminous felt) are robust and widely used, but their reliance on heat application introduces site risks and inherent limitations. Every overlap is a potential point of failure. While they offer excellent resistance to foot traffic and puncture, the system's performance is entirely dependent on the skill and precision of the applicator fusing the seams.

Maverick's Specification Recommendation

For critical, high-value assets (like multi-story commercial roofs and balconies), we generally specify high-quality polyurethane LAMs due to their seamless, long-term integrity. For large, open, and accessible industrial roofs, an expertly applied torch-on system can still be cost-effective. The choice is always substrate and project-specific.

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