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PIR (Polyisocyanurate) and PUR (Polyurethane) insulation is made by mixing a liquid polyol with a liquid polymeric isocyanate known as MDI in the presence of a blowing agent and other additives. This results in a rigid closed-cell low density thermal insulation.

Boards are typically used in masonry cavity walls, timber or steel frame walls, pitched and flat roof applications, warm roofs and all floor types. They can also be used with plasterboard laminates and in composite panels or sandwich panels with metal facings.

Injected PUR can be used in cavity walls and is especially good at treating narrow cavities. Its excellent adhesion means that it can also help bond the inner and outer leaves together, a useful application where wall ties have failed. PUR spray foam can be used in wall, roof and floor applications.

PIR and PUR both have excellent thermal insulation values and are highly space efficient, durable and lightweight. PIR, with its high compressive strength and cost-efficient assembly offers a competitive payback period when compared with other insulation types.


Masonry cavity walls
Timber or steel frame walls
Pitched and flat roofs
Warm roofs


Excellent insulation values
Space efficient and lightweight
High compressive strength
Recommended for flood resilient applications

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.