Synonymous with premium performance and ideal for small to medium sized projects requiring an extra tough, durable and highly impact-resistant finish.

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Extra-Tough and Hardwearing GRP Roofing System

Polyroof’s 185 GRP System is the UK’s leading GRP roofing system and has become synonymous with premium performance.  The 185 GRP System was the first ever fibreglass system to receive BBA certification and has been installed on roofs and balconies since 1984.

Always applied to a Polyroof approved OSB3 or plywood deck, the system carries a durability rating of up to 30 years and provides an exceptionally tough and hard-wearing membrane. Ideal for small to medium sized roofing projects, the 185 GRP System is available in a wide range of colours and finishes. 

The highly impact-resistant finish can withstand regular foot traffic without additional protection and when combined with an anti-slip finish, the 185 GRP System is the perfect choice for balconies and walkways.


Need help with selecting a system for your project?

Our Bespoke Solution Finder can provide you a detailed project pack containing all the relevant information for your project.

185 GRP System Gallery

Key Features

  • The toughest and longest lasting GRP roofing system on the market
    The original and the best: Polyroof’s 185 GRP system has been on the market since 1984, offering proven, durable waterproofing and lasting peace of mind for thousands of clients across the UK.
  • Superior Durability
    The 185 GRP System is BBA approved (Cert No. 91/2604) with a certified lifespan of at least 30 years.
  • Attractive Finish Available in a Wide Range of Colours
    Standard colours are Dark Battleship Grey, Light Battleship Grey, Lead Green, Dark Grey and Havana Brown.
  • Seamless Waterproof Membrane
    Applied as a liquid, 185 GRP System forms a seamless waterproof membrane with no joints, no welds and no weak points.
  • Cold Applied Installation with Zero Risks from Hot Works
    Unlike many traditional roofing materials that require open flame hot works to install, the 185 GRP System is fully cold applied meaning there are no risks of accidental fire during installation.
  • Trusted Guarantee
    The guarantee is supported for up to 20 years.
  • Fire Performance
    Can achieve classification of BROOF(t4), the top rating achievable for a flat roof system and designating Protec as unrestricted under the national requirements.

185 GRP System Applications

The 185 system is always applied to Polyroof approved plywood or OSB3 boards.

Usually used on roofs involving strip-and-replace works.

Ideal for any new build timber roof applications.

Ideal for use as part of a warm or cold deck roof design.

Available with a BBA approved extra tough anti-slip finish for trafficked areas.

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