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PIR Insulation Board

PIR insulation, also called Polyisocyanurate or PIR board, is a high-performance, rigid foam insulation with excellent thermal conductivity. It is moisture resistant and offers strong fire resistance. Suitable for lofts, floors, and walls, PIR board is space-saving thanks to its thin design. Our range of PIR insulation includes various sizes from Unilin.

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    Unilin Safe-R Pitched Roof Insulation PIR Board 2400 x 1200 x 100mm

    SR/PR on sloped roofs (ventilated, hybrid or warm) provides the most efficient U-values with minimal intrusion into valuable living space. The roof construction is a critical element in the building fabric and is an area at high risk of heat loss. Using...
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    Unilin Safe-R Pitched Roof Insulation PIR Board 2400 x 1200 x 120mm

    SR/PR on sloped roofs (ventilated, hybrid or warm) provides the most efficient U-values with minimal intrusion into valuable living space. The roof construction is a critical element in the building fabric and is an area at high risk of heat loss. Using...
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    Unilin Safe-R Pitched Roof Insulation PIR Board 2400 x 1200 x 25mm

    SR/PR on sloped roofs (ventilated, hybrid or warm) provides the most efficient U-values with minimal intrusion into valuable living space. The roof construction is a critical element in the building fabric and is an area at high risk of heat loss. Using...
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    Unilin Safe-R Pitched Roof Insulation PIR Board 2400 x 1200 x 40mm

    SR/PR on sloped roofs (ventilated, hybrid or warm) provides the most efficient U-values with minimal intrusion into valuable living space. The roof construction is a critical element in the building fabric and is an area at high risk of heat loss. Using...
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    Unilin Safe-R Pitched Roof Insulation PIR Board 2400 x 1200 x 50mm

    SR/PR on sloped roofs (ventilated, hybrid or warm) provides the most efficient U-values with minimal intrusion into valuable living space. The roof construction is a critical element in the building fabric and is an area at high risk of heat loss. Using...
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    Unilin Safe-R Pitched Roof Insulation PIR Board 2400 x 1200 x 60mm

    SR/PR on sloped roofs (ventilated, hybrid or warm) provides the most efficient U-values with minimal intrusion into valuable living space. The roof construction is a critical element in the building fabric and is an area at high risk of heat loss. Using...
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    Unilin Safe-R Pitched Roof Insulation PIR Board 2400 x 1200 x 75mm

    SR/PR on sloped roofs (ventilated, hybrid or warm) provides the most efficient U-values with minimal intrusion into valuable living space. The roof construction is a critical element in the building fabric and is an area at high risk of heat loss. Using...
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    Unilin Safe-R Pitched Roof Insulation PIR Board 2400 x 1200 x 80mm

    SR/PR on sloped roofs (ventilated, hybrid or warm) provides the most efficient U-values with minimal intrusion into valuable living space. The roof construction is a critical element in the building fabric and is an area at high risk of heat loss. Using...
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    Unilin Safe-R Soffit Insulation PIR Board 2400 x 1200 x 100mm

    Safe-R Soffit SR/ST provides effective thermal and fire performance solutions in structural ceiling applications in commercial and residential buildings. This high performance phenolic insulation board is faced with composite foil facings. Safe-R Soffit...
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    Unilin Safe-R Soffit Insulation PIR Board 2400 x 1200 x 50mm

    Safe-R Soffit SR/ST provides effective thermal and fire performance solutions in structural ceiling applications in commercial and residential buildings. This high performance phenolic insulation board is faced with composite foil facings. Safe-R Soffit...
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    Unilin Safe-R Soffit Insulation PIR Board 2400 x 1200 x 60mm

    Safe-R Soffit SR/ST provides effective thermal and fire performance solutions in structural ceiling applications in commercial and residential buildings. This high performance phenolic insulation board is faced with composite foil facings. Safe-R Soffit...
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    Unilin Safe-R Soffit Insulation PIR Board 2400 x 1200 x 75mm

    Safe-R Soffit SR/ST provides effective thermal and fire performance solutions in structural ceiling applications in commercial and residential buildings. This high performance phenolic insulation board is faced with composite foil facings. Safe-R Soffit...
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    Unilin Safe-R Soffit Insulation PIR Board 2400 x 1200 x 80mm

    Safe-R Soffit SR/ST provides effective thermal and fire performance solutions in structural ceiling applications in commercial and residential buildings. This high performance phenolic insulation board is faced with composite foil facings. Safe-R Soffit...
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    Unilin Safe-R Underfloor Insulation PIR Board 2400 x 1200 x 100mm

    Safe-R Under Floor SR/UF is a superior performance rigid phenolic insulation with low emissivity aluminium facings both sides and has a thermal conductivity as low as 0.020 W/mK, delivering excellent U-values in floors. The floor in any building is an...
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    Unilin Safe-R Underfloor Insulation PIR Board 2400 x 1200 x 25mm

    Safe-R Under Floor SR/UF is a superior performance rigid phenolic insulation with low emissivity aluminium facings both sides and has a thermal conductivity as low as 0.020 W/mK, delivering excellent U-values in floors. The floor in any building is an...
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    Unilin Safe-R Underfloor Insulation PIR Board 2400 x 1200 x 50mm

    Safe-R Under Floor SR/UF is a superior performance rigid phenolic insulation with low emissivity aluminium facings both sides and has a thermal conductivity as low as 0.020 W/mK, delivering excellent U-values in floors. The floor in any building is an...
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    Unilin Safe-R Underfloor Insulation PIR Board 2400 x 1200 x 60mm

    Safe-R Under Floor SR/UF is a superior performance rigid phenolic insulation with low emissivity aluminium facings both sides and has a thermal conductivity as low as 0.020 W/mK, delivering excellent U-values in floors. The floor in any building is an...
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    Unilin Safe-R Underfloor Insulation PIR Board 2400 x 1200 x 75mm

    Safe-R Under Floor SR/UF is a superior performance rigid phenolic insulation with low emissivity aluminium facings both sides and has a thermal conductivity as low as 0.020 W/mK, delivering excellent U-values in floors. The floor in any building is an...
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    Unilin Safe-R Underfloor Insulation PIR Board 2400 x 1200 x 80mm

    Safe-R Under Floor SR/UF is a superior performance rigid phenolic insulation with low emissivity aluminium facings both sides and has a thermal conductivity as low as 0.020 W/mK, delivering excellent U-values in floors. The floor in any building is an...
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    Unilin SafeR Thermal Insulation PIR Board DD 2400 x 1200 x 37.5mm

    Unilin / Xtratherm SafeR Thermal Insulation PIR Board is a composite insulated panel that combines Unilin / Xtratherm phenolic insulation with a glass tissue facing bonded to 12.5mm tapered edge plasterboard for internal applications, fixed with...
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    Unilin SafeR Thermal Insulation PIR Board DD 2400 x 1200 x 52.5mm

    Unilin / Xtratherm SafeR Thermal Insulation PIR Board is a composite insulated panel that combines Unilin / Xtratherm phenolic insulation with a glass tissue facing bonded to 12.5mm tapered edge plasterboard for internal applications, fixed with...
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    Unilin SafeR Thermal Insulation PIR Board DD 2400 x 1200 x 62.5mm

    Unilin / Xtratherm SafeR Thermal Insulation PIR Board is a composite insulated panel that combines Unilin / Xtratherm phenolic insulation with a glass tissue facing bonded to 12.5mm tapered edge plasterboard for internal applications, fixed with...
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    Unilin SafeR Thermal Insulation PIR Board DD 2400 x 1200 x 72.5mm

    Unilin / Xtratherm SafeR Thermal Insulation PIR Board is a composite insulated panel that combines Unilin / Xtratherm phenolic insulation with a glass tissue facing bonded to 12.5mm tapered edge plasterboard for internal applications, fixed with...
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    Unilin SafeR Thermal Insulation PIR Board DD 2400 x 1200 x 82.5mm

    Unilin / Xtratherm SafeR Thermal Insulation PIR Board is a composite insulated panel that combines Unilin / Xtratherm phenolic insulation with a glass tissue facing bonded to 12.5mm tapered edge plasterboard for internal applications, fixed with...

PIR Insulation Board

What are PIR boards?

PIR stands for Polyisocyanurate — a rigid type of thermal insulation made from plastic foam.

First introduced in the 1960s as an upgrade to PUR (Polyurethane) boards, PIR offers better insulation performance and versatility.

Where can PIR Insulation be used?

  • Walls – Products like Ecoliner are ideal for insulating and drylining internal walls. Eco-Versal suits timber frame walls, with both sides faced in aluminium foil for improved efficiency. As the name suggests, Eco Cavity is designed for cavity or masonry walls and fits standard brick and block dimensions.
  • Flooring – Works with most flooring types, including timber, solid concrete, and suspended floors. Insulating floors helps prevent heat loss and keeps interiors warmer.
  • Lofts – Loft spaces are one of the most common areas for heat loss. Using PIR or PUR insulation can improve energy efficiency and reduce heating costs.
  • Eco-Versal versatility – A popular PIR option that works across pitched roofs, walls, loft ceilings, and floors for consistent thermal performance throughout the home.

Frequently Asked Questions

What is pir insulation?
Polyisocyanurate (PIR) is one of the most efficient insulation materials used in construction. Pir insulation boards are typically available in the following sizes: 25mm, 75mm, 100mm, 120mm and 150mm.
What does pir stand for in pir insulation?
Polyisocyanurate, also referred to as PIR, is a thermoset plastic typically produced as a foam and used as rigid thermal insulation.
Is pir insulation flammable?
Whilst we urge you to refer to the manufacturer’s fire testing certifications, commercially available PIR insulation is not typically flammable.
Is pir insulation waterproof?
While PIR insulation boards are generally resistant to moisture, they are not fully waterproof.
What is the difference between pir and phenolic insulation?
As with the PIR/PUR boards above, phenolic insulation boards also have a closed cell structure. Phenolic board has a slightly higher r-value (higher is better, unlike u-values) and a slightly thinner profile than PIR/PUR boards due to the manufacturing process.

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