Encapsulate asbestos sheeting using sprayfoam and save money on replacing your roof.

Websters Insulation offers an alternative to the costly prospect of having to remove and dispose of an old asbestos roof. We can use our Webtherm Class One foam system to spray onto the underside of the roof and seal in the asbestos and provide a barrier between it and the environment.

We only currently offer products for encapsulation, and not for fibre suppression during removal.

Our supplier 'Isothane' offers Vanquish as a specialist liquid-applied encapsulation product that is suitable for most forms of asbestos that may be found inside buildings. It is not suitable for exterior use. It is rated Class 0 for surface spread of flame so maintains fire protection when used to encapsulate on the interior. Vanquish is the only Isothane product that may be used on asbestos other than Asbestos Cement ( AC ).

AC roof eg; ‘big 6’ may be coated on the interior with Vanquish, or if insulation is required, then spray foam alone on the interior may be acceptable ( Class 1 minimum of course, eg; Agrispray ). It may be coated on the exterior with a waterproofing membrane system such as EMA or Foamshield; and if insulation is required but the preference is to apply it to the outside then exterior foam could be first applied, eg; Thermadek, with the waterproofing membrane on top.

Any combination of the above could be acceptable to encapsulate an AC roof, therefore possible scenarios / options are as follows:

•Vanquish on interior only ( and no requirement specified for exterior protection because AC may be considered lower risk )
•Vanquish on interior and waterproofing membrane on exterior ( in case exterior encapsulation is insisted on or new waterproofing is needed because of the condition of the roof )
•Spray foam on interior only
•Spray foam on interior and waterproofing membrane on exterior
•Vanquish on interior and spray foam and waterproofing membrane on exterior
The situation has to be assessed on a case-by-case basis, because the HSE and surveyors, etc will often only advise asbestos cement to be encapsulated if it is exposed internally; and there is a possibility for kick damage i.e. on wall
cladding, or there is a lot of vibration in the building.