PIR is a strong, rigid board-type insulation material that consists of foil / kraft paper laminate-facings bonded together with aPolyisocyanurate core insulation (PIR) which is created via a continuous foaming process that creates a tight closed cell structure and an inseparable bond between the foil facings and foam core.


PIR insulation boards can be custom made up to 200mm thickness, but generally available in standard sizes that range from 2400mm by 1200mm sheet size and range between 15mm and 165mm in thickness. Variances to this would be 450 x 1200mm for partial and full fill cavity products and 1200 x 600mm for flat roofing materials.


PIR insulation boards have a yellow foam core with laminated foil facings, (please also consider that other facings substrates separate to foil will be utilised for flat roofing products) and the foil facings can have printed company logo’s. Edge Profiles can include butt-edged, rebated and tongue and grooved.


PIR is a strong, rigid board suitable for self-supporting applications in floors, walls and roofs and can withstand the loadings in ground bearing floors and most roofing applications.

Thermal Performance

The Polyisocyanurate (PIR) foam core of rigid insulation boards have an extremely low thermal conductivity, making the required thickness of insulation less than for most other types of insulation and making it an ideal choice where you are restricted with depth. The foil laminate facings of these boards also contribute to improved thermal performance and the low emissivity surface of the reflective foil can cut radiation heat transfer across an adjoining air space.

Fire Resistance

In the event of fire, PIR insulation boards will remain stable at temperatures up to 400ºC and achieve Class 1 surface spread of flame. If temperatures reach higher than 400ºC, a protective char forms on the surface on the boards to slow the spread of flames. PIR insulation boards may be used safely behind non-flammable materials such as plasterboard. For perimeters greater than detailed please consider using rigid phenolic insulation boards which also can help with thermal performance.

Environmental Impact

PIR insulation boards have a low thermal conductivity, which means less of the product is needed to achieve the desired thermal resistance and the closed-cell, rigid construction is designed for longevity. PIR Insulation has a GWP (Global Warming Potential) of <5. The insulation boards are also produced with a zero ozone depletion blowing agent.

Biological and Moisture Resistance

PIR insulation is created to be mould, pest and insect free and the boards will never rot. The foam boards have a low moisture absorption capacity and high vapour resistance.


The strong rigidity of PIR insulation boards with stand the weight of load-bearing floors. When the product is installed according to manufacturer’s specifications and industry codes of practice, the insulation boards have a service life comparable to that of the rest of the building.

Please note:

We have tried to provide information on our website mainly for technical and product specific purposes. To our knowledge this information is current but we are always reliant on the various manufacturers keeping us informed of any changes or updates where applicable. Can we ask that for any specific help or assistance that you either make contact with our office and or visit our trade counter showroom were one of our team members who are solely focused on providing expert advice for your project and specification needs will be pleased to help!