What is it?

OptiFlex-20 is a fast-curing, pure polyurethane, single-component, liquid waterproofing membrane. Applied with a brush or roller for a seamless and fully bonded membrane and reinforced with 225gsm matting, with OptiFlex-20 there’s no need for mechanical restraint to the roof substrate, making this a versatile and popular choice for many projects.

What can it be used for?

OptiFlex-20 is suitable for both commercial and domestic use and has a low odour formula which is perfect for sensitive sites, such as schools, hospitals, and nursing homes.

OptiFlex-20 also has a high level of flexibility and exceptionally tough characteristics, offering protection for the most demanding and complicated projects, with the ability to follow the silhouette of roofs with even the most intricate designs.

OptiFlex-20 is a completely flame-free system, ideal for the following:

  • Pitched roofs
  • Flat roofs
  • Green roofs
  • Balconies and walkways
  • Complex detailing
  • New construction
  • Refurbishment projects



  • Certified Lifespan in excess of 25 years

  • Available Guarantees of 15, 20 & 25 years

  • Certified for Green Roof

  • NHBC Projects Approved

  • Installed All Year Round

  • Holds Broof T1 Fire classification

  • Long Term UV Resistance

  • Excellent Bonding to most roofing substrates

  • Respects the environment during production and installation

  • No naked flames required

  • Allows pedestrian traffic once cured

  • Provide a modern and aesthetically pleasing roof finish

  • Technical reports and CAD Drawings

  • BBA Approved.


OptiFlex-20 Warm Roof

  1. Substrate
  2. OSA5-Primer
  3. OSA-Vapour Control Layer
  4. OptiTherm-Insulation Adhesive
  5. OptiTherm-PIR
  6. OSA5-Primer
  7. OSA-Vapour Control Layer
  8. OptiFlex-20 (Basecoat)
  9. OptiMatt-225
  10. OptiFlex-20 (Topcoat)
  11. OptiFlex-TC4 & Quartz

OptiFlex-20 Cold Roof

  1. Substrate
  2. OSA5-Primer
  3. OSA-Vapour Control Layer
  4. OptiFlex-20 (Basecoat)
  5. OptiMatt-225
  6. OptiFlex-20 (Topcoat)
  7. OptiFlex-TC4 & Quartz

Support requirements

In order to achieve a good penetration and bonding, surface must be:

  • Flat and levelled (OptiFlex-20 is self-levelling)
  • Compact and cohesive (Pull off test must show a minimum resistance of 1.4 N/mm2)
  • Even and regular surface
  • Free from cracks and fissures. If any, the must be previously repaired
  • Clean and dry, free from dust, loose particles


  • Keep at a temperature between 5°c – 25°c
  • The product must be stored properly in original, unopened, and undamaged sealed packaging
  • Higher storage temperatures may reduce shelf life of the product


OptiFlex-20 contains isocyanates and flammable solvents. Always follow the instructions provided in the material safety data sheet and take the precaution described there. As a general rule, a suitable ventilation must be ensured, and all ignition sources must be avoided. This product is intended to be used only for the uses and in the way here described. This product is to be used only by industrial or professional users.

OptiFlex-20 can only be used by a trained approved contractor.