GRP Fibreglass flat roofing in South London

gap fibreglass flat roof

Barris Roofing Ltd are manufacturer approved contractors in Crystic Roof Fibreglass / GRP flat roof installations. Each year, we complete approx 50 Grp / Fibreglass flat roof projects of various size throughout London and South London. Our Fibreglass flat roofs are guaranteed for 20 years!

*** Want an instant quote? Use this handy GRP cost estimator tool for an instant price ***

Attention Builders!

Why Choose a fibreglass / GRP Flat Roof?

There are many advantages to a fibreglass flat roof installed by Barris Roofing Ltd:

  • Completely free of maintenence
  • 20 Year Guarantee
  • Aesthetically pleasing finish
  • Resistant to cracking from solar damage
  • No heat required upon installation (no naked flame)
  • New timber deck installed on every GRP project
  • Range of colours available (may incur additional charges)
  • GRP can be applied to balconies by adding a non-slip material
  • Can withstand foot traffic
  • Flexible system capable of creating a neat finish on tricky detailed areas

Is Fibreglass (GRP) Flat Roofing Expensive?

On average, a GRP installation (including timber decking) will cost the customer approx £100+vat per square metre. Insulation can be added to the roof in the form of:

  • Between joist - using 100mm rigid board insualtion, or classic rockwool type insulation. This method would require the installtion of vents, which can be installed easily by us, at very little cost.
  • Over original deck - This method is achieved by laying 100mm rigid board insulation over the existing timber deck (old covering is removed first). The new 18mm OSB deck is then applied over the insulation boards, and screwed into the joists with 150mm screws. We recommend that you consider renewing your fascia boards (which we can do for you at little cost) when installing a warm roof. This is because the roof deck height is raised by 100mm and would leave the foam insulation visable if not covered by a larger or raised fascia board

GRP Flat Roofing: A Great Option For All Flat Roofs

Otherwise known as Glass Reinforced Plastic - GRP roofing, is more commonly known simply as fibreglass roofing, The plastic finish gets its strength from the glass fibres used in its application. A long lasting mix that seals your fibreglass flat roof against all the weather can throw at it.

Weatherproof and maintenance free, GRP roofing is now the most popular choice for flat roofing.

Short term, it is slightly more expensive than a felt system, but this is reflected in the quality and durability of the product by comparison.

Email Us Your Flat Roof Size

Email us with the sqaure meterage of your flat roof, and we can send you an estimate based on those sizes.


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Just posted a photo @ South London

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New side slope (*the front and rear were done by another company) in #Norbury @ Norbury

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Another new roof all finished up in #london #roofing

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Home improvements during Brexit.. yes or no? #Roofing #homeimprovements

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Two Barris employees in this band photograph. Myself and roofer @The_Versions. 👍🏻👍🏻#moonlighting

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Christmas is near! We’re offering fix now, pay February deals on repairs under £500. A helping hand for Christmas!

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Thinking of a #grp roof? Use our handy estimating tool to get an instant cost.…

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WIN!! £75 worth of John Lewis Vouchers! Visit our site and leave a review on our service. Closes 5th Nov 17.…