Check local branch stock
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![Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 25mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 25mm")
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 plasterboard for internal walls, sloped roofs and ceilings... -
![Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 50mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 50mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 50mm
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 Cavity Wall Insulation PIR Board 1200 x 450 x 50mm]( "Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 50mm")
Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 50mm
Thin-R CW is pre-formed to a system, building to the highest thermal standards whilst maintaining a residual cavity, offering protection from wind driven rain. XT/CW (T&G) for use in traditional masonry walls, builds to the highest thermal standards... -
![Unilin XT Thermal Liner DD Insulation PIR Board 2400 x 1200 x 32.5mm]( "Unilin XT Thermal Liner DD Insulation PIR Board 2400 x 1200 x 32.5mm")
Unilin XT Thermal Liner DD Insulation PIR Board 2400 x 1200 x 32.5mm
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 Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 75mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 75mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 75mm
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 40mm]( "Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 40mm")
Unilin Thin-R Pitched Roof Insulation PIR Board 2400 x 1200 x 40mm
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 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. -
![Unilin CavityTherm Full Fill Ext Corner Insulation PIR Board 1200 x 450 x 125mm]( "Unilin CavityTherm Full Fill Ext Corner Insulation PIR Board 1200 x 450 x 125mm")
Unilin CavityTherm Full Fill Ext Corner Insulation PIR Board 1200 x 450 x 125mm
CavityTherm Corner Fill is a preformed panel of CavityTherm that folds to provide a 90° corner either external or internal. Corner boards ensure excellent detailing and provide a template for setting out of outer brickwork. -
![Unilin CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 100mm]( "Unilin CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 100mm")
Unilin CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 100mm
CavityTherm is an innovative built-in insulation for traditional walls that achieves passive level U-Values as low as 0.12 W/m2K with excellent thermal bridging detailing in cavities less than 150mm wide. The board includes specifically designed rebated... -
![Unilin CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 125mm]( "Unilin CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 125mm")
Unilin CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 125mm
CavityTherm is an innovative built-in insulation for traditional walls that achieves passive level U-Values as low as 0.12 W/m2K with excellent thermal bridging detailing in cavities less than 150mm wide. The board includes specifically designed rebated... -
![Unilin CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 150mm]( "Unilin CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 150mm")
Unilin CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 150mm
CavityTherm is an innovative built-in insulation for traditional walls that achieves passive level U-Values as low as 0.12 W/m2K with excellent thermal bridging detailing in cavities less than 150mm wide. The board includes specifically designed rebated... -
![Unilin CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 90mm]( "Unilin CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 90mm")
Unilin CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 90mm
CavityTherm is an innovative built-in insulation for traditional walls that achieves passive level U-Values as low as 0.12 W/m2K with excellent thermal bridging detailing in cavities less than 150mm wide. The board includes specifically designed rebated... -
![Unilin ECO CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 150mm]( "Unilin ECO CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 150mm")
Unilin ECO CavityTherm Full Fill Insulation PIR Board 1200 x 450 x 150mm
Our CavityTherm 360 system is a bio-enhanced high performance composite board of enhanced PIR with a Lambda value as low as 0.020 W/mK for full fill cavity wall applications. When built into a traditional 110-150mm cavity using standard foundation... -
![Unilin Safe-R Cavity Wall Insulation PIR Board 1200 x 450 x 50mm]( "Unilin Safe-R Cavity Wall Insulation PIR Board 1200 x 450 x 50mm")
Unilin Safe-R Cavity Wall Insulation PIR Board 1200 x 450 x 50mm
Our Safe-R SR/CW Cavity Wall Insulation is an aircrete insulation for traditional masonry cavity walls. The product is designed to achieve excellent U-Values whilst maintaining a residual cavity, offering protection from wind driven rain. -
![Unilin Safe-R Cavity Wall Insulation PIR Board 1200 x 450 x 75mm]( "Unilin Safe-R Cavity Wall Insulation PIR Board 1200 x 450 x 75mm")
Unilin Safe-R Cavity Wall Insulation PIR Board 1200 x 450 x 75mm
Our Safe-R SR/CW Cavity Wall Insulation is an aircrete insulation for traditional masonry cavity walls. The product is designed to achieve excellent U-Values whilst maintaining a residual cavity, offering protection from wind driven rain. -
![Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 100mm]( "Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 100mm")
Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 100mm
Thin-R CW is pre-formed to a system, building to the highest thermal standards whilst maintaining a residual cavity, offering protection from wind driven rain. XT/CW (T&G) for use in traditional masonry walls, builds to the highest thermal standards... -
![Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 60mm]( "Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 60mm")
Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 60mm
Thin-R CW is pre-formed to a system, building to the highest thermal standards whilst maintaining a residual cavity, offering protection from wind driven rain. XT/CW (T&G) for use in traditional masonry walls, builds to the highest thermal standards... -
![Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 70mm]( "Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 70mm")
Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 70mm
Thin-R CW is pre-formed to a system, building to the highest thermal standards whilst maintaining a residual cavity, offering protection from wind driven rain. XT/CW (T&G) for use in traditional masonry walls, builds to the highest thermal standards... -
![Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 75mm]( "Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 75mm")
Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 75mm
Thin-R CW is pre-formed to a system, building to the highest thermal standards whilst maintaining a residual cavity, offering protection from wind driven rain. XT/CW (T&G) for use in traditional masonry walls, builds to the highest thermal standards... -
![Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 90mm]( "Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 90mm")
Unilin Thin-R Cavity Wall Insulation PIR Board 1200 x 450 x 90mm
Thin-R CW is pre-formed to a system, building to the highest thermal standards whilst maintaining a residual cavity, offering protection from wind driven rain. XT/CW (T&G) for use in traditional masonry walls, builds to the highest thermal standards... -
![Unilin Thin-R Cavity Wall Plus Corner Insulation PIR Board T&G 1200 x 450 x 80mm]( "Unilin Thin-R Cavity Wall Plus Corner Insulation PIR Board T&G 1200 x 450 x 80mm")
Unilin Thin-R Cavity Wall Plus Corner Insulation PIR Board T&G 1200 x 450 x 80mm
Unilin / Xtratherm Cavity Wall Plus XT/CWP (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. The Cavity Wall Plus tongue and groove... -
![Unilin Thin-R Cavity Wall Plus Insulation PIR Board T&G 1200 x 450 x 80mm]( "Unilin Thin-R Cavity Wall Plus Insulation PIR Board T&G 1200 x 450 x 80mm")
Unilin Thin-R Cavity Wall Plus Insulation PIR Board T&G 1200 x 450 x 80mm
Unilin / Xtratherm Cavity Wall Plus (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. The Cavity Wall Plus tongue and groove jointing... -
![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...
PIR Insulation Board
What are PIR Boards?
PIR stands for Polyisocyanurate and it is a rigid form of thermal insulation that is manufactured from plastic to create a foam.
PIR was introduced to the market in the 1960s, as an advanced replacement to PUR (Polyurethane) Boards.
PIR Insulation is suitable for use in a wide range of applications:
- Walls – Ecoliner products are suitable for insulating and drylining internal walls, whilst Eco-Versal offers timber frame walls thermal insulation with both faces including aluminium foil. As the name suggests, the Eco Cavity is used in Cavity/Masonry Walls and are designed to work with the typical dimensions of brick and block.
- Flooring – Suitable for most types of flooring including timber, solid and concrete, as well as suspended flooring, it is crucial to ensure that floors are fully insulated to tackle the problem of heat rising.
- Lofts – Loft spaces are a void that is the most common cause for heat loss, so choosing a good form of insulation such as PUR or PIR will help to save you money, whilst ensuring that your home is energy efficient.
- Eco-Versal is a popular choice of PIR insulation because it is effective at insulating a wide range of areas of your home including pitched roofing, walls, loft ceiling, and floors.
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.