Fibreglass (GRP) flat roofing membranes are one of the most popular flat roofing systems in the UK.
With decades of proven performance, Strandek’s fibreglass flat roofs are exceptionally strong, versatile, lightweight and robust. What’s more, they’re seamless and constructed to size, on-site. This makes it perfect for the harsh British weather!
Why Choose Strandek® Fibreglass GRP for your flat roof?
At Strandek® Flat Roofing, we’ve been installing flat roofs since 1976 – over 4,000 and counting! We’ve chosen fibreglass as our flagship flat roofing material for its proven performance, ability to withstand repeated freeze-thaw cycles, repeated impact and extreme weather.
Benefits of a Strandek® Installed Fibreglass Flat Roof:
- Over 40 years of proven performance
- 5-star reviews and excellent testimonials
- Safe, courteous and professional
- Optional Flat retardent: BS Class 1 and 0 476 and 476
- Optional non-slip coating (anti-skid)
- Full RAL & BS colour schemes
Guarantees & Warranty
Your flat roof is designed to protect your property, but what protects the flat roof itself? In our opinion, a new flat roof should come with its own system and workmanship guarantees, not to mention a third-party insurance-backed guarantee.
That’s why Strandek® installed fibreglass (GRP) flat roofs are accompanied by the following guarantees:
- 20-year Strandek® guarantee
- 10-year FCA-regulated insurance-backed guarantee
As a company, we’ve offered these for decades and have many real-world examples where our flat roofs have stood the test of time. The expected lifetime is a minimum of 30 years and with correct maintenance, the fibreglass material should last for up to 50 years.
What is Fibreglass GRP?
Used to build spacecraft, race cars, boats – and flat roofs…
Pioneered in the 1950s by the United States, fibreglass GRP technology has been adopted by the construction industry for a variety of applications, from concrete linings to architectural mouldings. Outside of the construction industry, Fibreglass GRP is used in the marine, aerospace and space as well as the renewable energy and automotive industries. Classic examples centre on waterproofing concrete linings for floors and walls, through to boat and yacht hulls, aeroplane wings, wind turbines and rockets.Applications of Fibreglass GRP Roofing
Applications for fibreglass roofing materials also extend to other roofing areas as well:
- Simulated lead flat roofing: lead has been a common material used on roofs for hundreds of years. The benefit of using fibreglass is that it can be tailored to a variety of shapes and ultimately used to imitate lead roofing.
- Non-slip coatings: these are designed to maximise grip and prevent slips at height
- Balconies, walkways and terraces: fibreglass is able to withstand frequent foot traffic, equipment placement like ladders and paving stones and still remain waterproof.
- Flat roof repairs: fibreglass GRP can be used on a variety of flat roofing surfaces to repair leaking or damaged flat roofs.
- Overlays: a low-cost way to save on your flat roof replacement – often by 50% or more!
- Architectural mouldings: need an in-situ design or structure? Look no further – GRP is perfect, being a malleable material pre-curing that can be shaped prior to curing and hardening.
- Gutter linings: from valley gutters to simple drainage channels, fibreglass is an excellent material for protecting your gutters and preventing leaks and water ingress
- Supporting sustainability: green sedum roofing and solar panels require a strong, stable surface.
Fibreglass Flat Roofing Materials
In general, a standard fibreglass flat roof comprises the following
- OSB3 Wooden decking: structural support designed to encapsulate the insulation and add a firm surface to the glass fibre waterproofing layer.
- Glass fire mat: also referred to as the chopped strand mat, this contains thousands of glass fibres presented in a sheeted roll.
- Unsaturated polyester resin: polymer-based liquid used to saturate glass fibre mat and form a composite structure once hardened.
- Resin catalyst: this accelerates curing of the resin
- PIR or vacuum insulation panels (VIP)
- Resin topcoat with added dye to BS & RAL colours
- Non-slip grit / aggregate
- Flame retardant
Contact a Fibreglass Flat Roofing Specialist
Do you want to upgrade or replace your existing flat roof with fibreglass? Look no further. At Strandek® Flat Roofing, we’ve been installing fibreglass flat roofs since 1976 and we have a proven track record. Send us an email for more information. We operate throughout Bristol, Bath, Yate and beyond.
Frequently Asked Questions (FAQs)
Some of the most popular questions on fibreglass roofing…
Q. How much does a fibreglass flat roof cost?
A. The average cost for a new flat roof with a fibreglass coating is £1,000 to £5,000 for a domestic property. Pricing should account for surface area, insulation costs, underlying woodwork, as well as the removal of any existing roofing system and workmanship costs.
Q. Who installs fibreglass flat roofs?
A. Trained and qualified flat roofing specialists like Strandek Flat Roofing. It is possible to install a flat roof yourself, but be sure to follow correct fibreglass roof installation procedures.
Q. How long does a fibreglass flat roof last?
A. A correctly installed and maintained fibreglass (GRP) flat roof should last a minimum of 30 years, up to a maximum of 50 years. GRP composites have superior performance to certain types of metal too.
Q. Are fibreglass flat roofs guaranteed?
A. Professionally installed fibreglass flat roofs should always come with a guarantee – our Strandek guarantees are 20-years. This is usually a company or system guarantee plus an FCA-regulated insurance backed guarantee of 10 years. We use the Independent Warranty Association for our 10-year flat roof insurance.
Q. What is not covered in my GRP roof guarantee
A. External damage caused by heavy impact (equipment placement) or incorrect design from the builder. The flat roofing insurance will only cover deficits in the system or incorrect installation by the roofer. This is the same reason why we recommend fibreglass – it can withstand a lot of impacts and can be designed to accommodate foot traffic unlike EPDM, PVC and other rubber roofing membranes.
Q. Can Skylights and Roof windows be included in my flat roof design?
A. Yes, we frequently install skylights, roof windows and other features as part of flat roofs for kitchens, orangeries and other properties requiring more light. Indeed, such wondows are a great way to add more natural light to your property, whilst also reducing energy consumption and improving health.