Asbestos Roof Coating System

Download Asbestoseal asbestos roof coating system Installation Instructions

Asbestos roof  problems are very common , since most have been installed for more than 40 years and, according to the Royal Institution of Chartered Surveyors, the life expectancy of these roofs is only 25-40 years.

Asbestos cement products were banned from use in the UK in 1999, but many older roofs remain in place today and are at, or have already exceeded their predicted life span. Consequently, many building owners are now experiencing difficulties with their asbestos cement roofs.

Before Liquasil Ltd was formed, our Chartered Building Surveying practice specialised in asbestos roofing issues and to this day, has a number of web sites dedicated to providing information about asbestos roofing issues.

The problems experienced are usually quite common and it’s not always necessary to replace the roof, though in most cases, this is what will be suggested by surveyors, since it gets rid of the asbestos and of course, new roofs add value and look good.

Because asbestos cement is banned from use, old asbestos roof and cladding sheets cannot be legally sold or taken off one roof to be installed on another building. Therefore, new roofs will usually be metal profile composite sheets comprising a layer of insulation material sandwiched between two metal sheets. This makes them very expensive, plus there’s the cost of removal and disposal to consider!

As you can imagine, not everybody can justify the cost of a new roof and consequently, alternative options need to be considered.

For wholesale refurbishment, Asbestoseal is the only BBA approved asbestos roof coating system on the market, making it the most cost-effective, independently tested system on the market.

Asbestoseal is only available through a Liquasil Approved Installer and from November 2016, comes with a 20 year latent defects, insurance warranty as standard on all installations of £10,000 or more in value – the first of its kind issued through a UK roof coatings manufacturer.

Asbestoseal 20 MSDS Non-Sag Sealer MSDS

Asbestos Roof Options

New Roof

New roofs always work! It’s probably not something that most roof coatings manufacturer will tell you, but as Liquasil is owned by building surveyors, we think you’d like to know the truth.

Of course, a new roof is the most expensive option and it causes the most disruption and is therefore not always practical in occupied buildings for obvious reasons.

When changing an old asbestos roof, the replacement (certainly in heated or cooled buildings), will need to be insulated, which in most cases, will involve adding composite metal sheets containing sufficient insulation for today’s building regulations. As emission targets get more aggressive, so too do the requirements for insulation, so roof sheets are getting thicker and heavier.

This means that you’ll need a structural engineer to calculate whether the roof you are planning to install can actually be supported by the existing trusses. It’s not a huge expense, but it’s something that needs to be considered before commencing a roof replacement project.

Over Cladding

This is a halfway-house option, still relatively expensive depending on the purpose of the building and whether it requires insulation, but it does involve drilling lots of holes into the asbestos cement sheets, which, even with proper precautions in place, still makes many occupiers a little nervous, sometimes with very good reason!

Over-cladding can be a good option in certain circumstances – it’s certainly cheaper than a new roof, but the “headline” price you often see quoted by some contractors is often way off the mark. Expect to pay in the region of £60-65 per sq metre and still have the old asbestos cement roof in place afterwards.

Just as when you’re replacing a roof, a structural engineer will need to calculate whether the existing structure can support the additional weight of insulation, framework and the new metal roof sheets.

Additionally, because you will almost inevitably be raising the height of the building due to the thickness of the insulation required, you will also need building regulations and possibly even planning permission before commencing the over-cladding project.

Patch Repair

We mention this only because some people still insist on carrying out patch repairs to older asbestos cement roofs.

Whilst some patch repairs might be economical, our view is that unless you’re tackling the entire roof, patch repair is often a false economy, as once these roof begin to cause problems, they do so in a number of places and it’s often difficult to know exactly where the water ingress is coming from, which often means multiple attempts at fixing them.

The cost of health and safety when accessing asbestos cement roofs cannot be ignored and it is not wise to try and make cost savings in this area, as it will be you as the building occupier who becomes responsible for any accidents that might occur.

Consequently, if you have the cost of health and safety in any event, you might as well take a wholesale approach to fixing the problems for the longer term.


Asbestoseal is the only coating that is approved by the British Board of Agrement for use on asbestos cement roofs.

It offers commercial property owners and occupiers an economical, wholesale repair and refurbishment option with minimal (if any) disruption to the normal operation of the building.

Designed by Building Surveyors to tackle all of the common problems associated with asbestos roofs, Asbestoseal is the obvious choice for professional specifiers.

Asbestoseal has many advantages over other coatings. It's flexible, available in any RAL colour, it's made for asbestos cement, nothing can take root on the surface and the superior water repellent features ensure that your building stays dry.

Asbestos Roof Safe Access

Using A Spandeck System