Flex vs HPX Liquid Roofing: Which Flat Roof Waterproofing System is Right for You?

HPX vs Flex Overlay Systems

When choosing a liquid waterproofing system for flat roofs, durability, flexibility, and installation speed are critical. Whether you’re managing a retrofit, urgent repair, or new roofing project, selecting the right solution can significantly impact performance and cost.

TriRoof offers two advanced cold applied waterproofing systems: MultiFlex and HPX Hybrid Polymer. Both deliver high-performance results—but which one is best for your project?

This guide breaks it down.

What is MultiFlex Roofing?

MultiFlex is a high-performance liquid waterproofing overlay system designed for both new and existing flat roofs. It bonds directly to surfaces like asphalt, felt, timber, GRP, and concrete—eliminating costly strip-offs.

Flex BRoof Tin

Key Benefits

  • Cold Applied Waterproofing: No hot works required, improving safety on site
  • All-Weather Performance: Can be applied in temperatures as low as 1°C
  • Fast Cure Time: Walkable in 30–60 minutes
  • 20-Year Guarantee: Reliable long-term protection
  • Fire Rated: Certified to BRoof (t4)

IDEAL USE CASES

  • Flat Roof Refurbishments – Upgrade without removing the existing roof
  • Cold Weather Installation Projects – Reliable in low temperatures
  • Fast-Track Jobs – Perfect for tight deadlines

 

What is HPX Liquid Roofing?

HPX is a hybrid polymer liquid roofing system that forms a seamless, elastic waterproof membrane. It’s a ready-to-use solution, making installation quick, easy, and reliable—even in poor conditions.

Key Benefits

  • All-Weather Application: Apply in cold, hot, or damp conditions
  • Ready to Use: No mixing required—straight from the tin
  • Highly Flexible Membrane – Adapts to roof movement
  • UV Resistant: Designed for long-term exposure durability

IDEAL USE CASES

  • Emergency Roof Repairs: Fast application in unpredictable weather
  • Difficult Roofing Conditions – Works where traditional systems fail
  • Versatile Projects – Adheres to multiple substrates

Flex vs HPX: Quick Comparison

Feature
MultiFlex
HPX
Application
Cold Applied System
Ready-to-use Liquid Roofing
Weather Range
Down to 1°C
Cold, hot and damp conditions
Cure Time
30-60 mins
2-4 hrs
Guarantee
20 years
20 years
Flexibility
High-performance system
Elastic membrane

Which Liquid Roofing System Should You Choose?

  • Choose MultiFlex if you need:
    • Fast curing times
    • Reliable installation in cold conditions
    • A durable overlay system for refurbishments

 

 

 

  • Choose HPX if you need:
    • A ready-to-use product for quick application
    • Performance in wet or unpredictable weather
    • A solution for emergency repairs

 

Frequently Asked Questions

Can I Apply These Systems Over an Existing Roof?

Yes. Both MultiFlex and HPX are overlay systems, making them ideal for upgrading existing surfaces with minimal disruption. They provide seamless liquid waterproofing for flat roofs without the need for removal.

Which System is Best for Emergency Roof Repairs ?

HPX is the best choice for urgent repairs. Its ready-to-use formula and ability to perform in damp conditions make it perfect for fast, reliable liquid roofing applications.

Do these systems require hot works?

No. Both systems are fully cold applied waterproofing solutions, improving safety and reducing installation risks.

Why Choose TriRoof for Flat Roof Waterproofing ?

Every project is different—and choosing the right flexible roof system is essential for long-term performance.

Whether you need:

  • A fast-curing solution like MultiFlex
  • An all-weather liquid roofing system like HPX

TriRoof has a proven solution to meet your needs.

 

Get Expert Advice Today

Not sure which system is right for your project?

Contact our team today for expert guidance on the best liquid waterproofing for flat roofs solution.

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