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Phenolic insulation is made by combining phenol-formaldehyde resin with a foaming agent which, when mixed with a hardener and rapidly stirred, causes a rapid setting of the foamed material. The foam forms an insulating core between two flexible tissue faced layers. It has a high closed cell content and fine cell structure.

It is typically used in masonry cavity walls, timber or steel frame walls, pitched and flat roof applications, as well as warm roofs. It can also be used with plasterboard laminates. Phenolic insulation has excellent insulation values and offers a versatile and space efficient solution.


Cavity walls
Timber or steel frame walls
Pitched and flat roof applications as well as warm roofs


Low thermal conductivity
Space efficiency

PIR = Superior thermal performance

Because of its superior thermal performance PIR insulation offers optimal insulation value meaning a thinner layer will achieve the same insulation properties.  This has other benefits, as using thicker insulation will mean a larger building footprint or smaller internal dimensions for a property.

The diagram shows the typical thicknesses of different wall insulation materials needed to achieve an R value of 4.5.