Spray Foam Insulation For Asbestos Encapsulation

It can be expensive to remove asbestos from buildings, particularly if it is in good condition and hasn’t reached the end of its life. Enverge Nexseal LE Closed Cell Spray Foam Insulation can act as a durable and stable method for asbestos encapsulation, enabling it to be left in-situ for the long-term. From asbestos containing roofs to wall substrates and even pipework, Enverge Nexseal LE is the solution to make your building safe and operational.

Nexseal LE For Asbestos Encapsulation

Enverge Nexseal LE Closed Cell spray foam is a rigid and durable insulation system that bonds to virtually any substrate to provide extensive protection and thermal performance. For asbestos containing surfaces, Nexseal LE can be spray-applied to 15-20mm to completely encapsulate and protect asbestos fibres from future damage or degradation. Unlike expensive removal of perfectly adequate asbestos materials, Enverge Nexseal LE can be installed rapidly to reduce downtime on your building and to protect occupants from the risks. Asbestos encapsulation is becoming an increasingly popular method of avoiding unnecessary removal.

Asbestos Encapsulant

Fast Install



Strong Adhesion




Asbestos Encapsulation Solutions

Enverge Nexseal LE Closed Cell Spray Foam Insulation comes in a winter and summer blend to ensure that it can be used year-round to provide asbestos encapsulation. The strong adhesion of Nexseal LE ensures that it completely covers all asbestos containing materials to trap the fibres between layers. This not only extends the life of asbestos containing materials but potentially makes future removal less risky on contractors and building occupants. Additionally, Nexseal LE provides enhanced thermal performance and can also eliminate condensation problems that can degrade asbestos substrates. The high-density of Nexseal LE Closed Cell helps to improve the structural integrity of roof and wall substrates to ensure the asbestos encapsulation is a long-term solution and not a quick fix.


Check our Enverge BBA-Certified Spray Foam Insulation For Asbestos Encapsulation

The Enverge range of spray foams include leading brands, Sucraseal Open Cell and Nexseal Closed Cell. Utilising recycled materials, manufactured sustainably with the environment in mind and containing HFO, water-based blowing agents, Enverge products offer thermal, airtightness and durability.

This low exothermic, high-lift closed cell foam boasts a fast installation time, offers incredible thermal performance and improves the structural integrity of a building. Loved by installers for its fast rise, Nexseal is ozone-friendly and holds BBA Certification.

One of the leading open cell foam systems now available in the UK. Sucraseal combines peace of mind British Class 1 fire safety with exceptional thermal performance and is fully certified by the BBA. Sucraseal is installed exclusively by ThermoFoam-approved contractors only.

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How Does The Spray Foam Trap Asbestos?

The spray foam hits the surface as a liquid and expands instantly to leave the substrate completely coated. This process prevents fibres from escaping and the spray foam will bond seamless to the surface on which it’s applied. We don’t recommend encapsulating asbestos that has already broken down and is structurally unsafe. Encapsulation should only take place when the asbestos bearing material is in good condition.

Isn’t It The Law To Remove Asbestos?

No – asbestos was made illegal in the 1990’s for future use, however, it is not illegal to have asbestos in your building. When detected, you need to make an asbestos management plan as to how you intend to mitigate the risks of fibres becoming airborne. This can either be resolved through licensed removal or it can be encapsulated if it poses little threat to any inhabitants. Encapsulation is always a viable consideration.

Can We Stay In The Building During The Process?

No – we recommended you are not within the building or the asbestos containing zone whilst we are carrying out encapsulation work. The pressure of the foam liquid hitting the surface can lift any loose fibres on the surface. We would only carry out encapsulation using spray foam in situations where the Asbestos containing material is a low grade, low risk to the wider public.

Do I Need Open Cell Or Closed Cell Spray Foam?

The adhesion of closed cell is unparalleled and it will usually bond to just about any type of surface. For this reason, we recommend its use. Closed cell spray foam is also a very dense material and once cured is extremely hard and durable. This means it’s unlikely to be penetrated and damaged which in turn could damage the asbestos. Open cell is less suitable as it can be subject to cohesive failure and has the density of a sponge.

How Long Will The Spray Foam Last?

The closed cell spray foam should last with the life of the building or surface onto which it’s applied, this means that if an asbestos bearing material is in good condition, there’s no reason that once encapsulated, it can last for an indefinite period of time. Encapsulation can be seen as a way to simply delay costly removal and pass on the problem to future generations. Whilst this is true, on occasions, removal can pose more harm than good.

What Condition Does The Asbestos Need To Be In?

When encapsulating asbestos, it should be in good condition with the substrate mainly intact. The structural integrity of the substrate should be firm and not at the stage where additional weight could cause it to break down further. We tend to avoid any substrate where asbestos is loose and fibres are already being released, however, a survey will generally tell us all we need to know.