GRP Balconies and Roof Terraces


If you are looking for the ultimate choice in waterproof grp balcony systems choose Topseal HD by Proshield, ideal for high performance waterproofing and direct foot traffic applications. With an in-built guarantee covering product & workmanship of 25 years and available in a wide range of colours and finishes Topseal HD delivers long lasting bespoke balcony and roof terrace systems, regardless of the size or complexity.

For grp balcony systems, Topseal offers unrivalled durability due to it’s fibreglass reinforcement and is able to accept heavy foot traffic direct onto the membrane with or without the use of extra finishing surfaces such as paving slabs or decking.

We can incorporate a warm deck using PIR insulation to build a warm deck or utlitise the system directly over existing failed bituminous surface such as felt, asphalt or concrete and screeds.


Topseal is the UK’s leading manufacturer of GRP roofing materials nationwide and has full BBA certification (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 that Topseal are focused on delivering consistent levels of customer satisfaction through a reliable and standardised process.

Choosing a Topseal approved installer like Proshield means that you can benefit from the confidence that our installers are fully trained and certified to use the products, we are also regularly vetted for compliance and quality control with random site inspections of our workmanship also undertaken. Topseal cannot be bought off the shelf unlike other inferior GRP fibreglass products available in the marketplace.

  • Over 1,000 different combinations of colours, and specialist finishes (non slip) available.
  • Versatile and flexible for new build, replacement roofs, listed or iconic buildings.
  • Up to 25-year product & workmanship guarantee with an optional insurance-backed guarantee, without loopholes or excuses.
  • Fully trained and Topseal approved installation teams.
  • Environmentally friendly by design and safe to install – no heat required.
  • BBA Approved, Fire Retardant and completely UV resistant.


The Topseal system has been specially formulated to deliver maximum performance when used for roofing, balconies, walkways or green roofs. Every Topseal system is expected to last over 100 years and is provided with a 25-year product materials and workmanship guarantee with an optional insurance-backed guarantee against insolvency of the installer. By extrapolating the results of 12-year advanced weathering tests, it is predicted that only 0.3mm of the surface layer would degrade after 50-years, with the product being able to provide all-weather performance long after this period.

BBA approval provides extra reassurance that materials used can be traced back to individual batches at source and proves that the product performance has been verified by laboratory testing, on-site inspection with rigorous quality control procedures in place. Topseal is also fire retardant and completely UV resistant, ensuring protection in the unlikely event of the roof being exposed to fire and is not degraded by exposure to the sun or high temperatures.

  • Can be installed in temperatures as low as zero degrees
  • Completely seamless – no joints or seams
  • UV and chemical resistant
  • Will withstand expansion and contraction caused by building movement
  • Suitable for flat (zero falls) / pitched roof applications
  • Full range of BS4800 or RAL colours
  • Simulated lead or copper finishes available
  • EXT.F.A.A fire rated to BS476: Part 3
  • BBA certified



With Topseal you are fully protected by a materials guarantee and workmanship guarantee for up to 30-years. Topseal provides a comprehensive manufacturers guarantee on materials with full BBA certification to ensure that materials can be traced by to their source. The workmanship guarantee is offered by the installer and ensures that they will install a roof that will remain watertight for 30years. The Topseal Guarantee Protection Scheme will ensure that your guarantee is as watertight as your new roofing system.

The Guarantee Protection Scheme is an optional insurance-backed guarantee which operates in the unlikely event that a Topseal roof does not remain watertight within its guaranteed period and the installer that would be obliged to repair the roof has declared themselves insolvent. The Guarantee Protection Scheme ensures that you continue to receive the highest quality product and service support for the full 30 years.

Unlike the majority of insurance-backed schemes, Topseal controls and administers the scheme in-house, ensuring that any dispute is managed quickly and effectively, without referral to any third party. With Topseal, there’s no loopholes and no excuses, only total transparency and a completely fair approach. That’s a guarantee.

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