Check local branch stock
-
![XTPRUF%20ROOF.png]( "XTPRUF%20ROOF.png")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 25mm
Unilin / Xtratherm XT Thermal Liner MF Insulation PIR Board is a composite insulated panel of Unilin / Xtratherm PIR insulation core with a composite foil facing bonded to 12.5mm tapered edge... -
![XTPR_UF_Roofs_IMG_002.png]( "XTPR_UF_Roofs_IMG_002.png")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 50mm
Thin-R Pitched Roof 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... -
![XTCW_IMG_001.png]( "XTCW_IMG_001.png")
Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 50mm
Thin-R Partial Fill Cavity Wall (T&G) builds to a system thanks to its engineered tongue and grooved joints and pre-formed corners, ensuring insulation continuity and minimisation of Thermal Bridging... -
![XTPR_UF_Roofs_IMG_002.png]( "XTPR_UF_Roofs_IMG_002.png")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 75mm
Thin-R Pitched Roof 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... -
![XTCW_IMG_001.png]( "XTCW_IMG_001.png")
Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 100mm
Thin-R Partial Fill Cavity Wall (T&G) builds to a system thanks to its engineered tongue and grooved joints and pre-formed corners, ensuring insulation continuity and minimisation of Thermal Bridging... -
![XTTL-MF_IMG_001.png]( "XTTL-MF_IMG_001.png")
Unilin XT Thermal Liner DD Insulation PIR Board 2400 x 1200 x 32.5mm
Drylining Wall Insulation Fixed with Adhesive Dabs Thin-R Thermal Liner (Dot & Dab) is a composite insulated panel of Unilin PIR wall insulation core with a composite kraft paper facing bonded to 12... -
![XTPR_UF_Roofs_IMG_002.png]( "XTPR_UF_Roofs_IMG_002.png")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 40mm
Thin-R Pitched Roof 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... -
![XTPR_UF_Roofs_IMG_002.png]( "XTPR_UF_Roofs_IMG_002.png")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 100mm
Thin-R Pitched Roof 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... -
![XTCWP.png]( "XTCWP.png")
Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 75mm
Thin-R Partial Fill Cavity Wall (T&G) builds to a system thanks to its engineered tongue and grooved joints and pre-formed corners, ensuring insulation continuity and minimisation of Thermal Bridging... -
![XTCW_IMG_001.png]( "XTCW_IMG_001.png")
Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 90mm
Thin-R Partial Fill Cavity Wall (T&G) builds to a system thanks to its engineered tongue and grooved joints and pre-formed corners, ensuring insulation continuity and minimisation of Thermal Bridging... -
![XTPR_UF_Roofs_IMG_002.png]( "XTPR_UF_Roofs_IMG_002.png")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 150mm
Thin-R Pitched Roof 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... -
![XTPR_UF_Roofs_IMG_002.png]( "XTPR_UF_Roofs_IMG_002.png")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 15mm
Thin-R Pitched Roof 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... -
![XTTL-MF_IMG_001.png]( "XTTL-MF_IMG_001.png")
Unilin XT Thermal Liner DD Insulation PIR Board 2400 x 1200 x 37.5mm
Drylining Wall Insulation Fixed with Adhesive Dabs Thin-R Thermal Liner (Dot & Dab) is a composite insulated panel of Unilin PIR wall insulation core with a composite kraft paper facing bonded to 12... -
![XTCW_IMG_001.png]( "XTCW_IMG_001.png")
Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 60mm
Thin-R Partial Fill Cavity Wall (T&G) builds to a system thanks to its engineered tongue and grooved joints and pre-formed corners, ensuring insulation continuity and minimisation of Thermal Bridging... -
![XTPR_UF_Roofs_IMG_002.png]( "XTPR_UF_Roofs_IMG_002.png")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 120mm
Thin-R Pitched Roof 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... -
![XTPR_UF_Roofs_IMG_002.png]( "XTPR_UF_Roofs_IMG_002.png")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 90mm
Thin-R Pitched Roof 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... -
![XTPR_UF_Roofs_IMG_002.png]( "XTPR_UF_Roofs_IMG_002.png")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 70mm
Thin-R Pitched Roof 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... -
![BEX00006581-02.jpg.jpeg]( "BEX00006581-02.jpg.jpeg")
Celotex TB4025 PIR Insulation Board 1200 x 2400 x 25mm
Celotex TB4000 is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. Available in thicknesses from 20mm to 40mm, it... -
![Ecotherm Eco Cavity PIR Insulation Board 1200 x 450 x 75mm]( "Ecotherm Eco Cavity PIR Insulation Board 1200 x 450 x 75mm")
![Ecotherm Eco Cavity PIR Insulation Board 1200 x 450 x 75mm]( "Ecotherm Eco Cavity PIR Insulation Board 1200 x 450 x 75mm")
Ecotherm Eco Cavity PIR Insulation Board 1200 x 450 x 75mm
Ecotherm Eco-Cavity is a high performance fibre free rigid polyisocyanurate (PIR) insulation board with aluminium foil composite to both sides. The boards are conveniently sized to co-ordinate with... -
![Unilin CavityTherm 100-150 Vent Panel 375 x 265 x 45mm]( "Unilin CavityTherm 100-150 Vent Panel 375 x 265 x 45mm")
Unilin CavityTherm 100-150 Vent Panel 375 x 265 x 45mm
A preformed insulation panel that creates an insulated Service Void for Periscopic Floor Vents in suspended floor situations. -
![CT_CTC_IMG_001.png]( "CT_CTC_IMG_001.png")
Unilin CavityTherm Full Fill Cavity Tray Insulation PIR Board 1200 x 350 x 100mm
Unilin Cavity Tray Channel helps maintain thermal continuity at roof-to-gable wall junctions, reducing heat loss while supporting compliant cavity wall construction. Designed to integrate with... -
![CT_CTC_IMG_001.png]( "CT_CTC_IMG_001.png")
Unilin CavityTherm Full Fill Cavity Tray Insulation PIR Board 1200 x 350 x 125mm
Unilin Cavity Tray Channel helps maintain thermal continuity at roof-to-gable wall junctions, reducing heat loss while supporting compliant cavity wall construction. Designed to integrate with... -
![CT_CTC_IMG_001.png]( "CT_CTC_IMG_001.png")
Unilin CavityTherm Full Fill Cavity Tray Insulation PIR Board 1200 x 350 x 150mm
Unilin Cavity Tray Channel helps maintain thermal continuity at roof-to-gable wall junctions, reducing heat loss while supporting compliant cavity wall construction. Designed to integrate with... -
![CT_EXTCRN_IMG_001.png]( "CT_EXTCRN_IMG_001.png")
Unilin CavityTherm Full Fill Ext Corner Insulation PIR Board 1200 x 450 x 100mm
The CavityTherm pre-cut corner boards are designed to provide a precise and efficient solution for achieving consistent detailing at cavity wall corners. Where required, corners can also be formed on...
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.
How to guides
What is the Green Homes Grant?
The £2 billion grant aims to encourage homeowners to make their homes more energy efficient, benefitting the environment as well as protecting and creating jobs.
Insulation for every application
Unsure how to keep your keep your heating costs down? Read this article on types of insulation and more.
Celotex Insulation
Saint Gobain Celotex Insulation guide - what is Celotex and how to use it.
How to insulate a garage
A step-by-step guide on how to insulate your garage. Find out more.
How to insulate a shed
A step-by-step guide on how to insulate your shed. Find out more.