Fibrelast Finishing Topcoat


The Fibrelast finishing topcoat is a premium flexible fire retardant GRP roofing product that’s applied over the cured Fibrelast base resin system to form a strong, long lasting roofing surface.




The last word in GRP fibreglass roofing

Fibrelast is a GRP (fibreglass) fire retardant roofing system that’s been specifically formulated for any new build timber roof application. The system cures to a highly durable and extremely hardwearing finish.


Fibrelast must be applied to a quality Allbase approved decking such as OSB3 18mm tongue and groove (Oriented strand board), a specially engineered wood particle board that’s created by adding adhesives and then compressing layers of wood strands in specific orientations.


The major advantage of Fibrelast is the products versatility, which allows the system to be used in a number of different scenarios.

  • Dormers
  • Porches
  • Bays & conservatories
  • Extensions
  • Green roofs
  • Balconies
  • Garage roofs
  • Lead replacement

Foot traffic

The Fibrelast system is available with non-slip finishes for walkways and heavy foot traffic. A Non-slip finish should be specified for high traffic areas and provides perfect protection for normal use on terraces, balconies and walkways. While the surface finish in anti-slip it will not eliminate the risk of slipping, particularly in winter conditions where ice has formed.

Thermal expansion

Fibrelast will withstand normal building movement and thermal expansion and contraction without the need for GRP expansion joints on surfaces up to 50 m2, if you are unsure if your roof surface needs expansion joints, please contact our customer support.

Pack sizes

Coverage rates depend on temperatures, in colder weather the finishing topcoat can sometimes become thicker and doesn’t apply at the same rates.

10kg Tin

Approx. 20m2

20kg Tin

Approx. 40m2

System properties

General properties for the Fibrelast system based on a standard installation.

Finishing options
Environmental performance

Curing times

The curing times shown are typical but may be affected by catalyst, promoter and external temperatures.

Working pot life

Full cure

Curing time

Finishing colours

To naturally blend in with the surroundings the Fibrelast finishing system comes in six colours as standard and can even be colour-matched from a specific sample using our Colourcoat service.


The best guarantee is the one you’ll never have to use, but just in case our Basecare protection has you covered.

Fibrelast is protected by our industry-leading Basecare guarantee that includes a range of benefits from standard product protection, approved contractor installation cover and our unique first 5 year Basecare+ warranty.


Fibrelast can be covered for up to 25 years depending on application

Additional information
Weight N/A

Allbase Coatings

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