Guaranteed for a generation, designed to last for a century
With full BBA certification and up to 40 years materials and workmanship guarantee(with Topseal DoubleTop), Topseal is the ultimate roofing system that money can buy. The Topseal GRP (commonly known as fibreglass) roofing system is installed nationwide by our network of approved installers and has a proven pedigree as a waterproofing material with an expected lifespan of 100 plus years to give you peace of mind for the life of your guarantee.
Topseal’s unique versatility allows it to be used for a wide range of applications including domestic roofs such as garages, extensions, dormers, porches, balconies and stairs through to simulated lead replacement for heritage and listed buildings, large scale commercial works and bespoke one-off specifications.
GRP Roofing Installation
Topseal, the UK’s leading GRP flat roofing company

Since 1992 Topseal has been offering a complete end-to-end solution for customers nationwide who want to replace their leaking flat roof with a stylish, high-performance GRP alternative that has been shown to last.

GRP has been established as the gold standard for containing or excluding water in a number of demanding applications such as boats, wind turbines and water tanks.This technology has been specially adapted in the UK by Topseal’s Research and Development specialists for use with roofing applications to offer the finest roofing system that money can buy.

Topseal roofs are only fitted by our national network of trained and approved installers.Topseal has the confidence to personally back each installer with its optional insolvency warranty and carries out frequent checks on Topseal installers and installations to ensure service and workmanship standards are maintained.
Low environmental impact

Topseal materials are designed with longevity in mind. The life expectancy of a Topseal roof substantially cuts the long term carbon foot print for a structure. Our core materials are also manufactured in the UK.

The timber decking used in the buildup of a Topseal roof is from fully certified FSC (Forestry Stewardship Council) members and all Topseal products are applied without the need for heat, so installation is both safe and environmentally neutral.

Topseal is ISO 14001 certified. This is the international standard for environmental management. We operate an effective Environmental Management System (EMS) and work towards improving our existing commitments to the environment.

GRP Roofing
Accredited and Certified Protection

The British Board of Agrément is the UK’s main independent body for verifying a manufacturer’s claims about their product. These statements are outlined within the Topseal BBA certificate which is available our website or from (certificate no: 93/2932). This is a guarantee that the stated performance of the product has been independently tested and verified.

Topseal is ISO 9001 certified, which ensures that the company operates to international quality standards. This means we are focused on delivering a consistent level of customer satisfaction through a reliable and standardised process.

Create your own Bespoke Roof

Whether you want a clean, modern, designer-look or a roof which will blend in effortlessly with a listed building, Topseal provides the ideal solution.With a wide range of colours and finishes to choose from Topseal can produce a completely bespoke roof, just the way you want it.

Topseal has featured on the TV programme Grand Designs and is popular with home builders who want the roof to be as outstanding as the rest of the project.

polyurethane roofing systems
Comprehensive Guarantees

Every Topseal installation is backed by our materials guarantee and covered by the installer’s guarantee on workmanship for the same period.Standard installations are covered for a period of 25 years. For installations where the DoubleTop system is used for roofing applications (not including heavy foot traffic applications), Topseal offers a class-leading 40 year guarantee.


Common Applications
Domestic Flat Roofs

Topseal offers a range of fantastic looking roofing solutions for common domestic applications such as extensions, garages, dormer roofs, parapet walls, gulleys, gutters, conservatories, orangeries and many more. The versatility of Topseal will ensure that it will fit in with almost any style from ultra-modern to heritage and listed buildings, providing long-lasting performance and style, even in the most extreme weather conditions and it comes in a choice of colours too.

Specify the standard system for a 25 year guarantee, Topseal HD for an extra durable system with a 30 year guarantee or Topseal DoubleTop with a 40 year guarantee.

Commercial/Industrial Roofing

From large-scale specialist projects to gulleys, walls, walkways and almost any feature or encasement, Topseal’s BBA approved system thrives on encapsulating or incorporating complex technical detail.Only fitted by Topseal’s nationwide trained and approved installers, the system provides an attractive and effective long-term solution with a class-leading guarantee of up to 40 years to fit the most demanding specifications.

Call us today with a tricky specification and the chances are we can solve it.

Simulated Lead/Copper

Topseal is used extensively as a lead/copper replacement or alternative for roofs, gutter linings and complex architectural detail work. For heritage and listed buildings Topseal can also be used to simulate rolled joints without seams.

Colour matching can be achieved by using a topcoat with a lead grey or copper green finish providing like-for-like appearance and long-lasting performance with a guarantee of up to 40 years. Topseal is also free from toxic water run-off associated with lead and copper and deters criminal damage due to its high durability and low effective scrap value.

Balconies and Walkways

For heavy-duty applications such as balconies, walkways, terraces, roof gardens and steps, Topseal HD provides an extra level of durability and waterproof protection.

Topseal HD is offered with a 25 year guarantee and is available in any of our standard colour options or matched to most RAL or BS 4800 colours. With a choice of our coated aggregate or anti-slip finish.

Balustrade supports, tiles or decking can be easily incorporated into the system providing limitless possibilities for your next project.

Green Roofs

Topseal GreenTop is Topseal’s ultimate green roofing system. Topseal GreenTop can be used to create a totally bespoke green roof with a low-maintenance sedum green roof, or an optional wildflower roof.

As well as creating a naturally beautiful bio-diverse area, Topseal GreenTop adds sound insulation to your property and delivers energy savings as it protects your property from internal temperature fluctuations in the Summer and Winter months.

The system is provided with Topseal’s class-leading 25 year watertight guarantee for peace of mind.

Topseal Features:

•20, 25, 30 or 40 year Materials & Workmanship guarantees.

• Optional 10 year Insurance Backed Guarantee available.

• Installation available nationwide with Topseal’s trained and approved installer network.

• BBA approved.

• ISO 9001 accredited. Operate to international quality standards.

• ISO 14001 accredited. Low environmental impact by design and safe to install.

• Fire rated to BS476-3: 2004 Standards and UV resistant.

• Completely bespoke with a wide range of colours and finishes available.

• Will withstand foot traffic as standard. For balconies, walkways or steps Topseal HD will withstand frequent, heavy foot traffic.

“Whether you have a simple
porch or a Grand Design in
mind, you can transform
your roof with Topseal”
Roof Build-Up & Technical Details
The Topseal system can be used on practically any type of roof including small domestic extensions, garages, dormer roofs, parapet walls, gulleys, gutters, conservatories or orangeries right through to large commercial projects. It will fit in with a building of any age, from listed to ultramodern.For more demanding applications, Topseal HD, DoubleTop and GreenTop, are designed to deliver the same high performance, under extreme conditions. 
  • Vapour check /12mm ext. ply sub-deck
  • Insulation
  • 18mm OSB3 deck
  • 450g/m2 Reinforcement Mat
  • Topseal Roofing Resin
  • Topseal Topcoat
  • Topseal GRP Edge Trim
  • 600g/m2 Reinforcement Mat
  • Drainage/moisture retention layer
  • GreenTop substrate
  • GreenTop sedum
  • Caledonian pebble border
  • Retention strip
  • Drainage retention strip
  • Pre-existing substrate


*The guarantee for each system maybe subject to change, please check with the Topseal office for the guarantee period on your chosen system
Create Your Topseal Roof
Step 1: Select your system
SystemSuitable applicationsAvailable GuaranteesNotes
TOPSEALAll roofing applications, domestic (garages, porches, extensions,
orangeries etc.), commercial
25 year guarantee of Workmanship and Materials + optional 10 year Insurance Backed Guarantee 
TOPSEAL HDAll roofing applications, domestic (garages, porches, extensions,
orangeries etc.), commercial, foot traffic applications (walkways,
balconies etc.)
30 year guarantee of Workmanship and Materials for roof application + optional 10 year Insurance Backed GuaranteeCoated aggregate or anti-slip finish recommended for foot traffic
TOPSEAL GREENTOPGreen Roofing25 year guarantee of Workmanship and Materials + optional 10 year Insurance Backed GuaranteeChoose between standard sedum or tray systems
TOPSEAL DOUBLETOPAll roofing applications, domestic (garages, porches, extensions,
orangeries etc.), commercial, foot traffic applications (walkways,
balconies etc.), ponds, swimming pools
40 year guarantee of Workmanship and Materials for roof application + optional 10 year
Insurance Backed Guarantee
Step 2: Select your colour
Step 3: Select your finish
Step 4: Contact us to arrange a free of
charge survey and quotation

Call now for a free of charge survey and quotation:

0800 0831 094



Every Topseal installer is allocated a unique verification number to prevent 3rd party misrepresentation. You should always ask any Topseal installer for their verification number.

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