When a flat roof needs a reliable waterproof finish, choosing the right system matters. Fibreglass roofing—also known as GRP roofing—creates a strong, seamless and fully bonded membrane suitable for new roofs, repairs and refurbishment projects.
Rose Building Supplies now stocks a dedicated range of fibreglass roofing supplies, including Restec Flexitec roofing kits, resin, fibreglass matting, finishing tissue, application tools and pre-formed GRP roof trims.
What is fibreglass roofing?
GRP stands for glass-reinforced plastic. A fibreglass roof is formed by combining resin with fibreglass reinforcement to produce a durable waterproof layer across the roof surface.
Unlike roofing systems that depend on overlapping sheets, a correctly installed GRP system forms a continuous membrane. This helps reduce vulnerable joints where water could penetrate.
Fibreglass roofing is commonly used for:
- Flat roof extensions
- Garages and outbuildings
- Bay windows, porches and dormer roofs
- Domestic and commercial refurbishment projects
What are the benefits of a fibreglass flat roof?
Seamless waterproof protection
Resin and fibreglass reinforcement combine to create a continuous waterproof surface. Correct installation and careful detailing around edges, corners, outlets and rooflights are essential for long-term performance.
Strong but flexible construction
Modern systems such as Restec Flexitec combine fibreglass reinforcement with the flexibility of a liquid-applied coating. This helps the finished membrane accommodate limited movement and bridge small cracks in suitable substrates.
Suitable for new roofs and refurbishment
Depending on the condition and preparation of the surface, Flexitec can be applied to substrates including felt, asphalt, concrete, existing GRP, PVC single-ply and OSB3. Always check the manufacturer’s application instructions to confirm suitability and whether primer is required.
Clean, professional finish
Pre-formed GRP trims help create neat edges, corners, wall junctions and drainage details, while the dark grey resin produces a clean, modern appearance.
Fast installation
Restec Flexitec has a typical walk-on or curing time of approximately 30–60 minutes per coat, depending on conditions. This can help reduce installation time compared with some traditional flat roofing methods.
What materials are needed for a fibreglass roof?
The exact materials depend on the roof size, substrate and detailing. A typical project may require:
- Roofing resin, hardener and suitable primer
- Fibreglass chopped strand matting
- Taping mat for joints and detailed areas
- Finishing tissue
- GRP edge, drip and wall trims
- Pre-formed internal or external corners
- Mixing buckets, rollers and brushes
- Acetone for cleaning uncured resin from suitable tools
For smaller projects, a complete kit can make it easier to purchase compatible materials in the correct quantities. The Restec Flexitec 10m² GRP Fibreglass Roofing Kit contains resin, primer, powder hardener, fibreglass matting and essential application tools for creating up to a 10m² membrane.
Why roof trims and detailing matter
A flat roof is only as effective as its edges, corners and junctions. Correct trims help direct water away from exposed areas and create watertight connections around the perimeter.
The Rose Building Supplies range includes drip trims for gutter edges, wall fillet trims, cover flashing trims, pre-formed corner units and finishing tissue for pipes, rooflights and awkward details.
Preparing for installation
- Check that the roof surface is dry, stable, clean and suitable for the chosen system.
- Repair damaged or unstable areas.
- Confirm whether the substrate requires primer.
- Plan the trims, joints, outlets and roof penetrations.
- Measure the roof and allow for waste when calculating materials.
- Check weather and temperature requirements in the manufacturer’s instructions.
- Wear the recommended gloves, eye protection and other personal protective equipment.
Resin and hardener must be measured and mixed accurately. Follow the official Restec Flexitec 2020 Application Manual and relevant product data sheets throughout the installation. If you are uncertain about preparation or application, use an experienced roofing installer.
Fibreglass roofing supplies in Peterborough
Rose Building Supplies is a local builders merchant serving roofers, builders and homeowners in Peterborough. Our fibreglass roofing range brings together Restec Flexitec kits, resin, reinforcement matting, GRP trims and application tools for flat roof projects.
Order online for convenient collection from our Peterborough branch, or contact our local team for product guidance and available delivery options across Peterborough and the surrounding area.
Shop fibreglass roofing supplies in Peterborough
Whether you are installing a new flat roof, refurbishing an existing surface or repairing a damaged area, our new category brings together the materials needed to complete the job.
Shop fibreglass roofing supplies online or speak to the Rose Building Supplies team for help selecting suitable materials.
Visit our Peterborough builders merchant
Rose Building Supplies Ltd
Fengate
PE1 5SW
Peterborough
Telephone: 01733 340270
Get directions to Rose Building Supplies Peterborough on Google Maps
Products are available for collection from our Peterborough and Huntingdon branches, with delivery options also available, including the Corby area.
