RG Johnson Construction Ltd

GRP Fibreglass Roofing Specialists

We specialise in GRP roofing systems for both residential and commercial projects. As a fibreglass roofing and waterproofing company we provide flat roof installations, replacement and fibreglass roofing repair. Please use the button below to request a survey or submit a general expression of interest. We are only too happy to guide you through any questions you might have.

What is GRP roofing?

GRP (Glass Reinforced Plastic) roofing is made from a polyester resin, which is reinforced by chopped strand mat glass fibres to form a GRP laminate. Often referred to as fibreglass roofing, it’s a durable, lightweight, flexible, fully reinforced and waterproof material capable of being moulded to any shape. Invented by Russel Games in 1938, it was originally used on water containers and boats. Today, it is one of the most popular choices in the construction industry for both new properties and the refurbishment of existing roofing systems.

Key GRP Services

Benefits of GRP

GRP Systems

GRP Design

Our GRP Services

The key GRP services we provide

  • GRP Flat Roofing
  • GRP Waterproofing
  • GRP Gutters
  • GRP Valleys
  • GRP Flooring
  • GRP Steps
  • GRP Canopy
  • GRP Roofing Trims
  • GRP Paint
  • GRP Surveys

Benefits of GRP

Core benefits of GRP / fibreglass roofing

  • High strength-to-weight ratio
  • Low maintenance
  • Affordable
  • Versatile
  • Corrosion Resistant
  • UV Stability
  • Durable
  • It weathers well
  • Low residual value

GRP Roofing Systems

Examples of GRP roofing systems

Cure It, Tough Stuff and Pro GRP
With guarantees of 20-25 years these systems provide peace of mind.

As the name suggests, an exceptionally flexible system which has the ability to move in line with the natural movements of a roof.

Fantastic liquid waterproofing systems, suitable for all flat roof, balcony and walkway applications.

Mark leaders in fibreflass roofing, providing an impressive 40-year guarantees for their double top systems.

GRP Design

The design of a GRP roofing system

Typically speaking, GRP roofing systems are a three-part product with liquid roof resin or reinforced matting. A further coat of resin is added with edge trims and a UV coating to finish off. On occasion, an additional traction coat is added for anti-slip purposes. 

GRP/Fibreglass is a highly rigid board, meaning that it is important a GRP systems is fixed while leaving gaps to the side in the instance of timber swelling from moisture exposure. Overall, GRP is an excellent solution for roofing with endless benefits and capabilities.