Available now · Surrey, London, Kent & the South East
GRP overlays

A new roof, without the tear-off.

Restec 2020 polyester resin laid directly over your existing felt, asphalt, fibreglass or EPDM. A complete waterproof skin without the cost and mess of a full strip-off.

How it works

We inspect the existing substrate, prime it, then apply the Restec system in two coats. The result bonds to what is already there and seals it under one continuous, flexible fibreglass layer.

GRP roof overlay on a property in Shoreditch, London

Is an overlay right for you?

An overlay works when

If the roof is sound underneath and the problem is only skin-deep, an overlay is usually the smarter choice.

  • The existing deck is sound
  • Failure is at the surface, not structural
  • There is no widespread trapped moisture

You will need a full replacement when

Some roofs are too far gone to cover. In these cases a strip and re-roof is the honest answer.

  • The decking is rotten or sagging
  • Moisture is trapped under the old covering
  • There are structural issues to put right

The upside

Every Smartseal roof comes in your choice of 92 BS4800 colours, with a smooth or non-slip finish to suit the job.

See the full palette & finishes

Frequently asked questions

Often yes. Our Restec overlay system is designed to go over a sound existing roof without a full strip-off, saving time and cost. We inspect the substrate first to confirm it is suitable.

Not always. If the deck and covering are sound and dry we can overlay directly. Where boards are soft or waterlogged, those areas are replaced first so the new GRP has a solid base.

An overlay carries the same 25-year guarantee as a new GRP roof, because it is the same seamless fibreglass system applied over a properly prepared existing roof.

Usually, because there is less labour and waste in stripping the old roof. We quote both options after a survey so you can compare like for like.

Accredited & approved

Topseal approved installer Confederation of Roofing Contractors approved member BBA Agrement certified Cure-It GRP roofing system Res-Tec waterproofing systems Flexitec Platinum approved installer GRP Roof Platinum approved installer
Ready when you are

Ask if an overlay
suits you.

A director will visit, measure up and talk you through colours and finishes. No pressure, no follow-up sales calls.