GRP (Glass Reinforced Polyester) roofing uses layers of woven fibreglass matting saturated with catalysed resin to create a single, monolithic waterproof membrane across your entire roof surface. Unlike traditional felt or rubber roofing, there are no seams, joints, or overlaps where water can eventually find its way through. The cured laminate bonds chemically to upstands, kerbs, and detail trims, producing a one-piece shell that is extraordinarily resistant to impact, foot traffic, and UV degradation. In Cumbria's challenging climate — where flat roofs face relentless rain, standing water, and freeze-thaw cycles — this seamless construction provides unmatched long-term protection that we regularly see exceed 30 years of maintenance-free service.
GRP roofing is only as good as the team installing it. Poorly mixed resin, inadequate matting overlap, or incorrect application in cold or damp conditions can lead to delamination and premature failure. Our installers are factory-trained and City & Guilds certified, with years of experience laying GRP systems across every type of property from coastal bungalows in Millom and Seascale to hillside homes in Ambleside and Grasmere. We carefully control resin-to-catalyst ratios, ensure proper consolidation of each laminate layer, and apply a professional topcoat in your choice of colours. Every installation includes proper edge trims, lead flashing interfaces, and drainage outlets sized for the catchment area.
While most people associate GRP with flat roofs, this remarkable material is equally suited to dormer cheeks, bay window canopies, balcony decking, gutter linings, and parapet capping. We regularly combine GRP flat roof sections with pitched slate or tile work during full roof replacements, creating a unified waterproofing system that eliminates the vulnerable junctions where different materials traditionally meet. For properties across the Lake District and Furness peninsula, GRP fibreglass provides the confidence that your flat roof sections will perform as reliably as the pitched areas above them, all backed by our comprehensive workmanship guarantee and verified through our Bark reviews.
A professionally installed GRP fibreglass roof typically lasts 30 years or more with virtually no maintenance required. The seamless, monolithic laminate is highly resistant to UV degradation, freeze-thaw cycles, and impact damage, making it particularly well-suited to Cumbria's challenging climate. Many installations we see from 20+ years ago are still fully watertight and performing well.
GRP fibreglass is ideal for the vast majority of flat roofs, including extensions, garages, dormers, bay windows, balconies, and outbuildings. It can be applied to new timber decks or laid over an existing sound deck as an overlay system. The only situations where we would recommend an alternative are very large commercial roofs exceeding certain spans, where movement joints may be needed, or where existing structural issues first need addressing. We assess every roof individually during our free survey to confirm suitability.
GRP fibreglass roofing costs vary depending on the size of the roof, the complexity of the detailing, and whether an overlay or full strip installation is required. As a general guide, GRP is typically priced similarly to or slightly above high-quality EPDM rubber, but it offers superior aesthetics and longevity that make it excellent value over time. We provide free, no-obligation surveys and detailed written quotations so you can compare costs accurately. Contact us to arrange your free survey.
In many cases, yes. GRP can be applied directly over existing flat roofing — including old felt, bitumen, or even a previous fibreglass layer — provided the timber deck beneath is structurally sound and free from rot or delamination. We carry out a thorough deck inspection during your free survey. Where the deck is compromised, we will strip and replace the affected boards before laying the new GRP system, ensuring a solid substrate that the fibreglass can bond to correctly and perform for its full service life.
Replacing like-for-like roofing on an existing structure generally falls under permitted development and does not require planning permission. However, if your property is a listed building or within a conservation area — which is common across parts of the Lake District and Cumbria — you may need listed building consent or conservation area consent before proceeding. If you are unsure, we recommend checking with your local planning authority. We are happy to advise based on our experience working with properties across Cumbria.
One of the greatest advantages of GRP fibreglass is how little maintenance it requires. We recommend keeping gutters and drainage outlets clear of debris, and an occasional check after severe weather to ensure nothing has caused physical damage. If the topcoat begins to show UV weathering after many years, a fresh topcoat can be applied over the existing laminate to restore both appearance and UV protection. Unlike felt or bitumen, GRP does not bubble, crack, or peel, making ongoing maintenance minimal and straightforward.
Yes. Our installers are City & Guilds certified and factory-trained in GRP roofing systems. We are also members of the Liquid Roofing and Waterproofing Association (LRWA), and we use Lloyds-approved resin systems to ensure every installation meets the highest industry standards. Our work is fully guaranteed, and you can read independent reviews of our GRP installations on Bark. We cover all of Cumbria and North Lancashire — contact us to arrange your free survey and quotation.
Full GRP fibreglass installation on a detached double garage in Dalton-in-Furness with slate grey topcoat. View this project
Seamless GRP roofing on a large kitchen extension in Windermere with integrated drainage outlets. View this project
Fibreglass dormer cheeks and flat top installation on a period property in Cockermouth. View this project
Mr Roofer UK provides professional grp fibreglass roofing services across Cumbria and North Lancashire. Our experienced team covers all major towns and surrounding rural areas, ensuring quality workmanship wherever you are. Select your nearest location below to learn more about our grp fibreglass roofing services in your area.
GRP Fibreglass Roofing Barrow-in-Furness · GRP Fibreglass Roofing Ulverston · GRP Fibreglass Roofing Dalton-in-Furness · GRP Fibreglass Roofing Askam-in-Furness · GRP Fibreglass Roofing Broughton-in-Furness · GRP Fibreglass Roofing Millom · GRP Fibreglass Roofing Kendal · GRP Fibreglass Roofing Windermere · GRP Fibreglass Roofing Bowness-on-Windermere · GRP Fibreglass Roofing Ambleside · GRP Fibreglass Roofing Coniston · GRP Fibreglass Roofing Hawkshead · GRP Fibreglass Roofing Grasmere · GRP Fibreglass Roofing Whitehaven · GRP Fibreglass Roofing Workington · GRP Fibreglass Roofing Cockermouth · GRP Fibreglass Roofing Egremont · GRP Fibreglass Roofing Cleator Moor · GRP Fibreglass Roofing St Bees · GRP Fibreglass Roofing Seascale · GRP Fibreglass Roofing Ravenglass · GRP Fibreglass Roofing Grange-over-Sands · GRP Fibreglass Roofing Cartmel · GRP Fibreglass Roofing Arnside · GRP Fibreglass Roofing Kirkby-in-Furness · GRP Fibreglass Roofing Haverigg · GRP Fibreglass Roofing Sedbergh · GRP Fibreglass Roofing Keswick · GRP Fibreglass Roofing Penrith · GRP Fibreglass Roofing Carnforth
Stop worrying about leaks, bubbles, and failing flat roof membranes. Mr Roofer UK's GRP fibreglass installations deliver decades of trouble-free performance with a beautiful, professional finish. Contact us today for a free survey and no-obligation quotation — our City & Guilds certified team covers all of Cumbria and North Lancashire with outstanding Bark-reviewed service.
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