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Written by Lucy Pitts

Let’s talk about GRP

We often get asked why we use Glass Reinforced Plastic (GRP) products and what’s so special about them. So we thought it would be helpful to explain.

GRP, also known as fibreglass, is polyester resin and chopped strands of glass fibres, which are mixed together to form a flexible fabric. GRP is a moulded product, meaning it must be placed in or around the shape of the item it is required to take.

GRP fibreglass has been around since the 1950s, but new production methods mean it has now been developed into a state of the art and superior material. It’s very strong and long lasting, but also light, flexible, fully reinforced, waterproof and capable of being moulded to any shape.

How do we use it?

We use it in two ways: for our flat roofing materials and as our GRP rafter replacement roof system.

GRP rafters

Our GRP rafters are strong, impact resistant and because GRP is so light and adaptable, we can use them in nearly any conservatory. The GRP rafters are a higher tensile strength than steel and don’t have any of the issues that aluminium or wood products can have such as condensation, thermal bridging or moisture absorption. They are also very easy and safe to install as well as being a very cost-effective option that are highly suitable for our thermally efficient systems.


Step 1 – GRP Rafters      Step 2 – Internal Boards     Step 3 – Celotex Insulation      Step 4 – Outer Sheets

Read more about Replacement Roofs


GRP flat roofing

GRP fibreglass roofing on a flat roof comes with may advantages:

  • Durability and Strength.  Fibreglass roofs can last up to 20 years.
  • Whatever size or shape your conservatory flat roof, we can cut the fibreglass to fit.
  • Waterproof and weather resistant.
  • Low maintenance and easy to repair.
  • Ease of installation. Easy to install without the need for heat equipment.

Read more about Flat Roofs

Evolving and innovating

Conservatories are in an industry which is ever evolving and developing more efficient materials. Part of our role is to keep a careful eye on these developments so that we can be sure that our products and systems are made up of the most effective, environmentally friendly but cost-effective materials.  We’re always looking for new ways to improve what we do, and we believe in being really transparent about the resources we use.

If you’d like to know about our materials, products and conservatory roof systems, please get in touch.



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