Asbestos, now banned in modern construction, is commonly found in the roofing sheets of older buildings. Poorly maintained and degrading roofs can become problematic when extremely harmful airborne dust fibres are inhaled or ingested leading to respiratory problems or even Cancer.
Removing and disposing of asbestos is a specialist job and can be incredibly expensive. If you have an asbestos roof that is in good condition you can prevent its deterioration by using spray foam insulation to encapsulate and extend its lifespan.
With seamless adhesion to every inch of the roof, spray foam encapsulation provides an air and watertight seal protecting your roof against long-term degradation. As a preventative measure, encapsulation is a fast, effective and inexpensive solution compared to the alternative.
We recommend an application of 30mm of ThermoFoam closed-cell to create a thermal envelope of asbestos roofs whilst eliminating condensation. A thicker coating of 50-60mm will offer great heat retention and structural integrity for your building.
Although we install both open and closed-cell products, not all spray foams are created equal, therefore we are always careful to respect the application uses for both products in achieving the correct install for your building.
Open Cell is a low density sponge like foam, making it an effective barrier against noise transmission and adds good thermal performance to a building.
When used in areas that are susceptible to moisture intrusion, Open Cell foam will absorb this moisture which can create issues within the building or structure it is applied to.
To overcome this, we always recommend an application of Closed Cell foam for buildings that have metal, asbestos or cement roofs. These are commonly held together by bolts and gaskets, which when rusted or broken, act as the first entry point for moisture.
Closed Cell is a high density rigid foam, that acts as a very good vapour barrier. It helps to bind all aspects of a roof substrate to prevent the degradation or loosening of bolt fixings and adds structural integrity.
As little as 25mm of Closed Cell insulation will eliminate condensation whilst an application of 50mm will provide exceptional thermal performance. Both depths offer strong adhesion to the substrate to future-proof its integrity.
We commonly install a Closed-Cell Spray Foam in instances where asbestos is present. Asbestos is found commonly in older buildings constructed pre-1990’s and we’ve encapsulated many corrugated asbestos fibre roofing sheets.
When an asbestos roof begins to degrade, fibres can become airborne. The Closed Cell Insulation is spray-applied direct to every inch of the surface to bond and seal the underside of the roof from further degradation. Fibres cannot escape through the Closed-Cell foam.
No, it’s important to assess the damage to an asbestos roof before choosing the right solution. If the roof is in condition and bears no obvious breakdown of fibres then encapsulation is a great solution to future-proof the roof and give it longevity.
Where the roofing panels are badly damaged with cracks, holes and you can clearly see a breakdown of fibres, you should seek advice from an asbestos expert as to what the recommended solutions are. You can send us images if you would like some genuine advice.
It’s against the law to fit any asbestos bearing material to a building as it was outlawed in the UK in 1999. Thousands of UK buildings contain asbestos and it’s not always practical or safe to remove it, particularly if it isn’t damaged.
The HSE provide extensive advice on asbestos (visit http://www.hse.gov.uk/asbestos for more info). Where possible, asbestos can be managed in-situ meaning that the high cost of removal could be avoided. This is where ThermoFoam is a useful alternative to removal.