Skip to content
Rated by 1,300+ customers
Fast UK mainland delivery
GRP roofing specialists
Order Top-UpWhatsApp support
Top Tips Account Basket £0.00

Fibreglass Roofing Kits (GRP Flat Roof Kits)

CRS KIT FINDER

Find your GRP roofing kit

Just 3 quick answers: roof surface, what you need to do, and roof size. We will show the matching kit or the right next step.

Fire Rated RoofsShop category
More info

Shop fire-rated GRP roofing kits, fire-rated fibreglass roofing kits and upgraded flat roofing kits for projects where fire performance or building control…

Heavy Duty RoofsShop category
More info

Shop heavy-duty 600g GRP roofing kits for larger flat roofs, stronger laminates, walkways, commercial projects and more demanding applications.

Standard RoofsShop category
More info

Shop 450g GRP roofing kits for garages, extensions, garden rooms and standard domestic flat roofs. Our most popular fibreglass roof kit weight…

Showing 1–16 of 23 resultsSorted by price: low to high

About GRP Roofing Kits & buying advice

Shop complete GRP roofing kits and fibreglass roof kits for garages, extensions, sheds, porches, dormers and outbuildings. Choose 300g, 450g, 600g and fire-rated GRP systems with resin, matting, catalyst, topcoat and optional tools.

Complete GRP system

From complete kit to every roofing component

Use the complete kit route first, or move directly into the resin, reinforcement, trims, preparation and tools that make up the system.

Compare the specification

Other GRP roofing systems for the same project

Compare the roof duty and specification rather than hopping between brands. The correct route depends on the roof area, intended use, substrate and any fire-performance requirement.

300g GRP Roofing KitsLighter-duty route for smaller roofs where the project specification allows it.Compare route →450g GRP Roofing KitsStandard domestic route for garages, extensions and general flat roofing.Compare route →600g GRP Roofing KitsHeavier-duty laminate route for larger or more demanding roof specifications.Compare route →Fire Rated GRP Roofing KitsSpecification route for projects where external fire performance must be considered.Compare route →
Coverage transparency

Measure the roof, then choose supplied coverage

  1. Measure the finished roof area before ordering.
  2. Choose a kit whose stated supplied coverage meets or exceeds that area.
  3. Check the exact kit contents and whether trims, primer, deck materials or tools are included.
Is this right for my roof?

Check the substrate before laminating

A new GRP roof needs a dry, stable and compatible deck installed to the chosen system guidance. Do not assume standard GRP can be laminated directly onto an unknown, damp or failed existing roof surface.

Buying guide

Choose GRP Roofing Kits, Fibreglass Roofing Kits & Flat Roof Kits for installing a new GRP fibreglass flat roof over a suitable OSB3 or timber deck.

Good choice when

  • Use this category for installing a new GRP fibreglass flat roof over a suitable OSB3 or timber deck.
  • Use it when the surface is new OSB3 or suitable timber roof deck.
  • Use it when the measurements, preparation work and related accessories have been checked.

Consider another route when

  • Do not use this category when the existing roof only needs a quick repair, coating or overlay rather than a new GRP system.
  • Do not use it when the roof is unsafe or unsuitable without preparation.
  • Do not use it as a shortcut if another CRS system is a better fit.

Next step: Choose the kit weight, check the roof size, then add the correct trims and tools before ordering.

GRP Roofing Kits, Fibreglass Roofing Kits & Flat Roofing Kits

GRP roofing kits are also commonly searched for as fibreglass roofing kits or flat roofing kits. They are designed to create a seamless, fully bonded flat roof system for garages, extensions, sheds, dormers, balconies, outbuildings and commercial flat roofs.

Our range includes 300g, 450g, 600g and fire-rated GRP flat roofing kits, helping DIY and trade users choose the correct fibreglass roof system based on roof size, use and strength requirement.

What Is Included In A Fibreglass Roofing Kit?

Most GRP and fibreglass roofing kits include roofing resin, fibreglass matting, catalyst hardener and topcoat. Selected flat roofing kits are also available with optional tool packs for easier installation.

Depending on the roof detail and edge design, you may also require GRP trims, bandage tape, acetone, rollers, buckets and application tools.

Which Flat Roofing Kit Weight Should I Choose?

300g GRP roofing kits are generally suitable for sheds, porches and smaller domestic roofs. 450g fibreglass roofing kits are commonly used for garages, extensions and most standard flat roofing projects. 600g flat roofing kits are designed for larger roofs, stronger laminates and heavier-duty applications.

Fire-rated GRP roofing kits are also available for projects where upgraded fire performance or building regulation requirements may need to be considered.

Why Choose A GRP Fibreglass Flat Roof?

Fibreglass roofing systems are popular because they create a strong, fully bonded waterproof surface with no joints or seams across the main roof area. GRP roofs are widely used on domestic and commercial flat roofing projects due to their durability, low maintenance and long service life.

When installed correctly onto a suitable deck, a GRP flat roof system can provide a clean, modern and long-lasting roofing solution.

Frequently asked questions

What is a GRP roofing kit?

A GRP roofing kit is a complete fibreglass flat roofing system designed to create a seamless waterproof roof covering using roofing resin, fibreglass matting, catalyst and topcoat.

What does a fibreglass roofing kit include?

Most fibreglass roofing kits include resin, fibreglass matting, catalyst hardener and topcoat. Some kits are also available with optional tool packs.

Which GRP roofing kit is best for garages and extensions?

450g GRP roofing kits are normally the most popular choice for garages, extensions and standard domestic flat roofs.

What is the difference between 300g, 450g and 600g GRP kits?

300g systems are generally used for smaller domestic roofs, 450g systems are suited to most standard flat roofs, while 600g systems are designed for larger or more demanding applications requiring a stronger laminate.

Are fire-rated GRP roofing kits available?

Yes. Fire-rated GRP roofing kits are available for projects where upgraded fire performance or building regulation requirements may need to be considered.

WhatsApp Help Product & order support