Fibreglass Flat Roofing

Strandek-installed fibreglass flat roofs have been proven over many decades.

With a full range of guarantees, we’ve got you covered.

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Ideal for protecting all flat roofs, from domestic garages to factories, offices and residential care homes, fibreglass is a proven flat roofing system.

In addition to exceptional performance, Strandek-installed fibreglass roofs come with a 20-year Strandek® workmanship guarantee and a 10-year FCA-regulated IWA insurance-backed guarantee.

Call us today on 01633 250652 to find out more.

Our Services

Durable & Reliable Fibreglass Roofing

At Strandek, we've specialised in fibreglass roofing since 1976. Our services include new flat roofs, upgrades and extensions as well as repairs and refurbishments.

We also offer flat roof inspections, surveys as well as offering condition reports to support insurance claims. repairs, new installations. provide estimates for its lifetime and quotations for refurbishment.


Reviews and Accereditations

Fibreglass roofing specialists - since 1976

Reliable Fibreglass Roofing - Quality You Can Trust Since 1976

Professional & Fully Accredited

Strandek offers a fully compliant, professional team with an excellent track record in flat roofing.

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High Performance Fibreglass Roofing

Expert waterproofing from expert roofers.


Fibreglass roofing systems are ideal for a range of flat roof projects, from property extensions and new builds to orangeries and conservatories. Versatile and adaptable, it is used to repair and refurbish existing roofs. More durable fibreglass designs can be used to accommodate foot traffic and equipment placement.

Quality by design

Fibreglass is an ideal material for aerospace applications due to its superior waterproofing and mechanical properties. This composite material is a blend of resin and glass fibre reinforcement which, when cured, forms a structure that is incredibly strong with a degree of flexibility to accommodate structural movement, UV- and water-resistant. These properties make fibreglass an ideal choice for the construction industry and perfect as a flat roof membrane.

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✓ 30+ year life expectancy: strong, durable, chemical-resistant
✓ Guarantees: 20-year Built GRP materials guarantee, 20-year Strandek® workmanship guarantee, 10-year IWA guarantee
✓ High-performance fibreglass flat roofing technology
✓ Two Systems: S600 (standard single-layer laminate) or D600 (heavy duty dual-layer laminate)
✓ BBA® certified insulation
✓ BBA® OSB3 decking (FSC-certified)
✓ Optional flame-retardant resin (BS Class 1 and 0 476 and 476)
✓ Optional Built GRP Non-Slip coating

Fibreglass Roofing Case Studies

Established 1976, we’ve installed thousands of flat roofs. Here’s some of our work.


Our Customers

Frequently Asked Questions

Are fibreglass (GRP) flat roofs long-lasting?

Yes, a correctly installed fibreglass flat roof will last 30+ years.

How much do fibreglass flat roofs cost?

Approximately the same as other flat roofing systems. Since 1976, we’ve found fibreglass roofs to out-last rubber and other sheeted membranes, so the lifetime cost is cheaper versus less durable flat roofing systems.

Why is fibreglass better than EPDM or PVC single ply?

In short, it is much more durable – it is resistant to tearing so tolerates foot traffic, is extremely hard-wearing and it is puncture resistant.

Why does fibreglass have a bad reputation?

This is almost always down to poor installation quality. Applicators that are not properly trained or do not install a fibreglass system correctly cause flat roofing systems to leak.

How can I choose a reliable flat roofing installer?

Look for: 1) a long, successful track record, 2) insurance-backed guarantees, 3) accreditations and 4) a good technical understanding.

What is the Built GRP Fibreglass Roof System?

Built GRP is an independently tested fibreglass roofing system. Demonstrating superior mechanical properties and excellent waterproofing, it offers extensive guarantees and an approved contractors list. There are two tyes: S600 (single layer laminate) for standard applications and the D600 (dual layer) for more demanding applications expecting foot traffic.

Is fibreglass any good as a roofing material?

Yes, fibreglass has a high strength-to-weight ratio, long-term durability and waterproofing potential as well as excellent abrasion resistance and impact resistance. Unlike other membranes, it can tolerate foot traffic. It is also versatile, meaning it can be applied to a range of substrates, from timber to concrete and plywood.

Is fibreglass stronger than metal?

Yes, some fibreglass composites exhibit very high strength-to-weight and modulus-to-weight ratios comparable to some metallic materials.

Why Choose Strandek®?

Since 1976, Strandek has provided high-quality glass fibre and other resin-based coatings to a range of satisfied customers in industry, government, construction and residential sectors alike.


Our team have extensive experience and we pride ourselves on reliable workmanship and competitive pricing.

  • Unrivalled service
  • Exceptional quality
  • Unmatched speed

Health & Safety

A strong health & safety ethic is the core of our business. We strive to maintain this through:

  • Best practices
  • Transparency & accountability
  • Rigorous training