C Stevens Roofing

Excellence in Roofing

GRP Flat Roofing..

GRP Roof System

Glass Reinforced Plastic

GRP is a specifically modified high performance waterproofing system, designed to a provide a permanent solution to the problems usually associated with bitumen based coatings. For example cracking and blistering of the surface caused by the effects of sunlight which can result in failure of the roof within a few years

GRP more commonly referred to as "glassfibre" is formed in situ by reinforcing polyester resin, which has been cured or hardened using a peroxide based catalyst with an emulsion bound chop strand mat. Once cured this forms a joint free laminate that will outlast virtually any other traditional roofing material.

GRP Advantages

Polyester Roof System

Glass Reinforced Plastic roofing has many advantages :

  • 20 year guarantee
  • Cold Applied and Cured
  • Maintenance free
  • BAA Certified
  • Fire Retardant
  • Lightweight


GRP roofing is a cold applied system that is ideally suited to both simple and complex structural designs and can be rapidly applied and cured to prevent water ingress giving total protection. The weld free design gives a continuous high performance covering. Available in a range of colours to suit the project, ideal for balconies, walkways, gutters and valleys and any domestic roof. The finish can simulate lead or other traditional finishes.

High performance is achieved as the GRP is made up of a combination of modified polyester base resins, emulsion bound chop strand mat and a finishing coat of pre-pigmented topcoat. When cured GRP is guaranteed to provide performance beyond that of more traditional bitumen or polymer based waterproofing coatings.

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GRP Roof on Extension

GRP systems have been used successfully for over 20 years. They are fast becoming the preferred choice of Architects, Specifiers and Local Authorities. Installed by highly skilled and suitably trained installers, clients can be assured that GRP will continue to perform long after more traditional coatings have failed.

Every waterproofing application is formed entirely using GRP (Glass reinforced Polyester) guaranteeing no variation in rates of thermal expansion within the laminate. Being cold applied it can be easily installed to any shape or form and to close even the most complicated detail.

Thousands of square metres of specifically modified GRP waterproofing coatings are chosen every year with confidence, by discerning customers. A system complete with a comprehensive guarantee, which can be insurance backed if required. A system that has undergone extensive testing and is only installed by trained professionals.

GRP Valley

The flexibility of GRP allows unusual shapes to be covered with ease and the GRP system can successfully be adapted for application to pitched roofs and vertical walls. The smooth tough surface can with-stand light foot traffic and may be upgraded at the time of application for use on balconies.

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