MultiFlex vs HPX Liquid Roofing: Which Flat Roof Waterproofing System Is Right for You?

HPX & FLEX TriRoof Roofing 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.

TriRoof MultiFlex Overlay System

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.

TriRoof Flex Key Features

Key Benefits

  • Cold Applied Waterproofing – No hot works required, improving on-site safety
  • All-Weather Performance – Apply in temperatures as low as 1°C
  • Rapid Cure Time – Walkable in just 30–60 minutes
  • 20-Year Guarantee – Long-term peace of mind
  • 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.

TriRoof_HPX Key Features

Key Benefits

  • All-Weather Application – Perform in cold, hot, or damp conditions
  • Ready to Use – No mixing required
  • Highly Flexible Membrane – Adapts to roof movement
  • UV Resistant – Built for long-term exposure

 

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

 

MultiFlex vs HPX: Quick Comparison

Feature
MultiFlex
HPX Hybrid Polymer
Application
Cold applied system
Ready-to-use liquid
Weather Range
Down to 1°C
Cold, hot & damp
Cure Time
30-60 minutes
2-4 hours
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 designed as overlay systems, allowing you to upgrade existing flat roofs without removal. This reduces cost, time, and disruption.

Which system is best for emergency roof repairs?

HPX is the best option for urgent repairs. Its ready-to-use formula and ability to cure in damp conditions make it ideal for fast, effective waterproofing.

Do these systems require hot works?

No. Both are cold applied waterproofing systems, 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.

TRIROOF ARTICLES

GRP Flat Roof
Construction & Building Solutions
Fibreglass vs EPDM for Flat Roofs

When selecting a flat roofing system, understanding the differences between fibreglass (GRP) and EPDM rubber is crucial. This guide compares their durability, installation processes, maintenance requirements, and overall performance to help you make an informed decision. Whether you’re a homeowner

Read More »
GRP Flat Roof
Construction & Building Solutions
Flat Roof Systems Compared

Explore the key differences between popular flat roofing options including Concrete, Asphalt, Felt, EPDM, and Fibreglass/GRP. Learn about the materials, application methods, and benefits of each system to help you choose the best solution for your project.

Looking for a

Read More »
GRP Fibreglass Roofing
Construction & Building Solutions
Installing a Fibreglass Roof

GRP, or Glass Reinforced Plastic, is a strong, lightweight material known for its durability and resistance to corrosion—ideal for roofing systems. This guide explores the benefits of GRP, its common uses, and how to correctly install a long-lasting fibreglass roof

Read More »