GRP Flat Roof vs. Felt: Which Flat Roof is Best for Your Teesside Home?

If you have a flat roof on your garage, extension, or dormer, you’ve probably spent a rainy night or two wondering if today is the day the "big leak" starts. Living in Redcar, Middlesbrough, or Cleveland, our flat roofs have to work harder than most to stand up to the North Sea winds and driving rain.

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At Felgate Family Roofing, we get asked all the time: "Should I go with traditional felt or upgrade to GRP Fibreglass?" Both have their place, but making the right choice now can save you a lot of money (and damp patches) down the line. Here is our expert breakdown for local homeowners.

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Traditional Felt Roofing: The Budget-Friendly Classic

Felt roofing has been the "go-to" for decades, and for good reason. It’s cost-effective and, when installed by a professional, provides a solid barrier against the elements.

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• Best for: Outbuildings, sheds, or homeowners looking for a reliable but affordable repair.

• The Pros: It’s the most wallet-friendly option and is very quick to install.

• The Reality: In a coastal climate like Marske-by-the-Sea, felt doesn't have the longest lifespan. Over time, the seams can lift in high winds, and the sun can make the material brittle.

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GRP Fibreglass: The "Fit and Forget" Solution

GRP (Glass Reinforced Polyester) is essentially a single-piece laminate applied over your roof. Because it has no seams, there are no "weak spots" for the Teesside rain to get through.

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• Best for: Extensions, balconies, or any roof you want to last for 30+ years.

• The Pros: It’s incredibly tough (you can walk on it), looks modern, and is completely waterproof. Because it’s a cold-applied liquid, there’s no need for "hot works" or flames on your roof during installation.

• The Reality: It costs more upfront than felt, but because it lasts twice as long, it usually works out cheaper in the long run.

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Comparison at a Glance

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Felt Roofing

Expected Lifespan: 10–15 years

Seamless?: No — joints can leak

Durability: Moderate

Initial Cost: Lower

GRP Fibreglass

Expected Lifespan: 30+ years

Seamless?: Yes — one solid sheet

Durability: High — foot-traffic safe

Initial Cost: Higher

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Why Local Knowledge Matters

A roof in Middlesbrough city centre deals with different stresses than a roof sitting right on the front in Saltburn. We’ve seen DIY flat roofs literally peeled back by a gale because the wrong adhesive was used for our climate.

As a local, family-run business, we don't just "slap on a roof." We ensure the boarding underneath is sound and the drainage is pitched correctly so you don't end up with "ponding" water.

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Get a Free Local Quote

Whether you need a quick patch-up on a leaking felt roof or you want to upgrade your home with a lifetime GRP solution, we’re here to help. We provide honest, no-pressure advice and free quotes across Redcar, Cleveland, and the surrounding areas.

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Get in touch with Paul today:

• 📧 Email: pafelgate@hotmail.co.uk

• 📞 Phone/WhatsApp: 07495 449219