PIR Insulation Boards

At Trusted Building Supplies, we can supply a wide range of PIR insulation boards designed to deliver outstanding thermal performance for walls, floors and roofs. Manufactured from rigid polyisocyanurate (PIR), these boards are lightweight, easy to install and achieve thermal conductivity as low as 0.022 W/mK. Whether you’re working on a new build, refurbishment, cavity wall or pitched roof project, our foil faced PIR insulation boards help meet strict U-value requirements while saving space and improving energy efficiency.

Types of PIR Insulation Boards

GA4000 General Purpose PIR Boards

The Celotex GA4000 range is suitable for use in floors, walls and pitched roofs, providing reliable performance in a slim profile. Available in a range of thicknesses, these rigid PIR boards help achieve compliance with UK building regulations.

CW4000 Cavity Wall PIR Boards

Designed for partial fill applications, the Celotex CW4000 boards are lightweight, rigid and foil faced, improving thermal resistance in cavity walls while being simple to cut and install.

XR4000 High Thickness PIR Boards

For projects requiring enhanced insulation, the Celotex XR4000 range offers thicker boards with R values up to 9.05 m2.K/W. These high performance PIR insulation boards are ideal for builds where superior energy efficiency is essential.

Thermaclass Full Fill Cavity Wall Boards

The Celotex Thermaclass Full Fill Cavity Wall 21 boards are designed for full fill cavity wall installations. With a thermal conductivity of 0.021 W/mK and low emissivity foil facings, they provide excellent thermal efficiency and can be installed either as full fill or with a 10mm residual cavity.

Insulated Plasterboard

For a convenient 2-in-1 option, Celotex insulated plasterboard combines PIR insulation with tapered edge plasterboard, allowing you to insulate and dry line walls or pitched roofs in one step.

Why Choose PIR Insulation Boards?

High thermal efficiency with low conductivity values for energy savings
Lightweight, rigid boards that are easy to cut, handle and install
Versatile applications across floors, pitched roofs and cavity walls
Foil faced boards designed to boost performance in cavity and reflective systems
BBA certified solutions trusted by contractors and specifiers across the UK