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![Unilin Thin-R Cavity Wall T&G Insulation PIR Board 1200 x 450 x 100mm]( "Unilin Thin-R Cavity Wall T&G Insulation PIR Board 1200 x 450 x 100mm")
Unilin Thin-R Cavity Wall T&G Insulation PIR Board 1200 x 450 x 100mm
Unilin / Xtratherm Thin-R Cavity Wall XT/CW (T&G) insulation builds to a system, thanks to its engineered tongue and grooved joints and pre-formed corners. This ensures insulation continuity and minimisation of thermal bridging. XT/CW (T&G) is made for... -
![Unilin Thin-R Cavity Wall T&G Insulation PIR Board 1200 x 450 x 90mm]( "Unilin Thin-R Cavity Wall T&G Insulation PIR Board 1200 x 450 x 90mm")
Unilin Thin-R Cavity Wall T&G Insulation PIR Board 1200 x 450 x 90mm
Unilin / Xtratherm Thin-R Cavity Wall XT/CW (T&G) insulation builds to a system, thanks to its engineered tongue and grooved joints and pre-formed corners. This ensures insulation continuity and minimisation of thermal bridging. XT/CW (T&G) is made for... -
![Unilin Thin-R Flat Roof ALU Single Ply Insulation PIR Board 2400 x 1200 x 150mm]( "Unilin Thin-R Flat Roof ALU Single Ply Insulation PIR Board 2400 x 1200 x 150mm")
Unilin Thin-R Flat Roof ALU Single Ply Insulation PIR Board 2400 x 1200 x 150mm
Unilin / Xtratherm FR/ALU is a high performance Polyisocyanurate flat roof insulation with vapour-tight aluminium foil facings suitable for use with single ply membranes. Designed to fit and seal the full range of single ply roofing systems. The unique... -
![Unilin Thin-R Flat Roof BGM Insulation PIR Board 1200 x 600 x 25mm]( "Unilin Thin-R Flat Roof BGM Insulation PIR Board 1200 x 600 x 25mm")
Unilin Thin-R Flat Roof BGM Insulation PIR Board 1200 x 600 x 25mm
Unilin / Xtratherm ThinR Flat Roof BGM Insulation PIR Board is ideal for use with partially bonded, torched-on and built-up bituminous felt systems. Built-up Bituminous Felt (BGF) is faced with a polypropylene fleece finished bitumen/glass fibre working... -
![Unilin Thin-R Flat Roof MG Single Ply Insulation PIR Board 1200 x 600 x 25mm]( "Unilin Thin-R Flat Roof MG Single Ply Insulation PIR Board 1200 x 600 x 25mm")
Unilin Thin-R Flat Roof MG Single Ply Insulation PIR Board 1200 x 600 x 25mm
Unilin / Xtratherm TR/MG is a high performance Polyisocyanurate with mineral coated glass facers suitable for use below single ply fully adhered roof membranes, single ply waterproofing systems and partially bonded built-up felt. Especially suited in... -
![Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 100mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 100mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 100mm
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 plasterboard for internal walls, sloped roofs and ceilings... -
![Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 120mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 120mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 120mm
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 plasterboard for internal walls, sloped roofs and ceilings... -
![Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 125mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 125mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 125mm
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 plasterboard for internal walls, sloped roofs and ceilings... -
![Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 130mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 130mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 130mm
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 plasterboard for internal walls, sloped roofs and ceilings... -
![Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 140mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 140mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 140mm
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 plasterboard for internal walls, sloped roofs and ceilings... -
![Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 15mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 15mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 15mm
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 plasterboard for internal walls, sloped roofs and ceilings... -
![Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 165mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 165mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 165mm
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 plasterboard for internal walls, sloped roofs and ceilings... -
![Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 30mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 30mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 30mm
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 plasterboard for internal walls, sloped roofs and ceilings... -
![Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 60mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 60mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 60mm
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 plasterboard for internal walls, sloped roofs and ceilings... -
![Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 70mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 70mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 70mm
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 plasterboard for internal walls, sloped roofs and ceilings... -
![Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 90mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 90mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 90mm
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 plasterboard for internal walls, sloped roofs and ceilings... -
![Unilin XT Thermal Liner DD Insulation PIR Board 2400 x 1200 x 50.5mm]( "Unilin XT Thermal Liner DD Insulation PIR Board 2400 x 1200 x 50.5mm")
Unilin XT Thermal Liner DD Insulation PIR Board 2400 x 1200 x 50.5mm
Unilin / Xtratherm XT Thermal Liner is specifically designed to create a thermal break in the building envelope and provide a maximum level of insulation with minimal acoustic impact. It is perfectly suited to modern constructions projects where high... -
![Unilin XT Thermal Liner MF Insulation PIR Board 2400 x 1200 x 37.5mm]( "Unilin XT Thermal Liner MF Insulation PIR Board 2400 x 1200 x 37.5mm")
Unilin XT Thermal Liner MF Insulation PIR Board 2400 x 1200 x 37.5mm
Unilin / Xtatherm XT Thermal Liner MF Insulation PIR Board is a composite insulated panel of Xtratherm PIR insulation core with a composite foil facing bonded to 12.5mm tapered edge plasterboard for internal walls, sloped roofs and ceilings. XT/TL-MF is... -
![Unilin XT Thermal Liner MF Insulation PIR Board 2400 x 1200 x 52.5mm]( "Unilin XT Thermal Liner MF Insulation PIR Board 2400 x 1200 x 52.5mm")
Unilin XT Thermal Liner MF Insulation PIR Board 2400 x 1200 x 52.5mm
Unilin / Xtatherm XT Thermal Liner MF Insulation PIR Board is a composite insulated panel of Xtratherm PIR insulation core with a composite foil facing bonded to 12.5mm tapered edge plasterboard for internal walls, sloped roofs and ceilings. XT/TL-MF is... -
![Unilin XT Thermal Liner MF Insulation PIR Board 2400 x 1200 x 62.5mm]( "Unilin XT Thermal Liner MF Insulation PIR Board 2400 x 1200 x 62.5mm")
Unilin XT Thermal Liner MF Insulation PIR Board 2400 x 1200 x 62.5mm
Unilin / Xtatherm XT Thermal Liner MF Insulation PIR Board is a composite insulated panel of Xtratherm PIR insulation core with a composite foil facing bonded to 12.5mm tapered edge plasterboard for internal walls, sloped roofs and ceilings. XT/TL-MF is... -
![Unilin XT Thermal Liner MF Insulation PIR Board 2400 x 1200 x 72.5mm]( "Unilin XT Thermal Liner MF Insulation PIR Board 2400 x 1200 x 72.5mm")
Unilin XT Thermal Liner MF Insulation PIR Board 2400 x 1200 x 72.5mm
Unilin / Xtatherm XT Thermal Liner MF Insulation PIR Board is a composite insulated panel of Xtratherm PIR insulation core with a composite foil facing bonded to 12.5mm tapered edge plasterboard for internal walls, sloped roofs and ceilings. XT/TL-MF is... -
![Xtratherm Thin-R Cavity Fill PIR Insulation Board T&G 1200 x 450 x 115mm (XT/CF/115/BD/RB01)]( "Xtratherm Thin-R Cavity Fill PIR Insulation Board T&G 1200 x 450 x 115mm (XT/CF/115/BD/RB01)")
Xtratherm Thin-R Cavity Fill PIR Insulation Board T&G 1200 x 450 x 115mm (XT/CF/115/BD/RB01)
Thin-R Partial Fill Cavity Wall (T&G) builds to a system thanks to its engineered tongue and grooved joint and pre-formed corners, ensuring insulation continuity and minimisation of thermal bridging. Cavity Wall (T&G) for use in traditional masonry... -
![Xtratherm Thin-R Cavity Fill PIR Insulation Board T&G 1200 x 450 x 140mm (XT/CF/140/BD/RB01)]( "Xtratherm Thin-R Cavity Fill PIR Insulation Board T&G 1200 x 450 x 140mm (XT/CF/140/BD/RB01)")
Xtratherm Thin-R Cavity Fill PIR Insulation Board T&G 1200 x 450 x 140mm (XT/CF/140/BD/RB01)
Thin-R Partial Fill Cavity Wall (T&G) builds to a system thanks to its engineered tongue and grooved joint and pre-formed corners, ensuring insulation continuity and minimisation of thermal bridging. Cavity Wall (T&G) for use in traditional masonry... -
![Xtratherm Thin-R Cavity Fill PIR Insulation Board T&G 1200 x 450 x 90mm (XT/CF/090/BD/RB01)]( "Xtratherm Thin-R Cavity Fill PIR Insulation Board T&G 1200 x 450 x 90mm (XT/CF/090/BD/RB01)")
Xtratherm Thin-R Cavity Fill PIR Insulation Board T&G 1200 x 450 x 90mm (XT/CF/090/BD/RB01)
Thin-R Partial Fill Cavity Wall (T&G) builds to a system thanks to its engineered tongue and grooved joint and pre-formed corners, ensuring insulation continuity and minimisation of thermal bridging. Cavity Wall (T&G) for use in traditional masonry...
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.