Celotex PIR Insulation Boards

Celotex PIR insulation boards are a popular and reliable choice for thermal insulation across floors, walls, and roofs. Made from rigid polyisocyanurate (PIR) foam, these boards offer excellent thermal performance while keeping insulation thickness to a minimum, helping you save space without compromising energy efficiency.

Celotex boards are lightweight, easy to cut, and simple to install. With foil facings on both sides for enhanced thermal resistance and moisture control, they’re suitable for a wide variety of construction applications—from solid floors and pitched roofs to timber frame and masonry walls. Their durability and all-round performance make them a favourite in both residential and commercial builds.

At Insulation UK, we stock a full range of Celotex (Soprema) PIR insulation boards, available in various thicknesses to help you meet specific U-value targets. Ideal for new builds, retrofits, or renovations—this is a dependable solution that gets the job done efficiently.

Celotex TB4000 Series

• Purpose: Designed for thermal bridging and slimline applications

• Thickness Range: 20mm to 45mm

• Best For: Situations where space is tight—such as detailing around window reveals, door jambs, or between rafters.

• Key Feature: Ultra-thin boards that maintain insulation continuity and reduce cold spots.

• Applications: Ideal for floors, walls, and roofs where minimal thickness is needed.

Celotex GA4000 Series

• Purpose: The general-purpose insulation board in the Celotex range.

• Thickness Range: 50mm to 100mm

• Best For: Standard wall, floor, and pitched roof insulation projects.

• Key Feature: Versatile, easy to install, and suitable for most typical applications.

• Applications: Floors (solid and suspended), walls (masonry and timber frame), and roofs (pitched and flat).

Celotex XR4000 Series

• Purpose: Extra-Rigid, high-thickness insulation for maximum thermal performance.

• Thickness Range: 110mm to 200mm

• Best For: Projects targeting very low U-values or working with deep cavities or voids.

• Key Feature: Minimises heat loss with fewer layers needed—ideal for energy-efficient or passive builds.

• Applications: Deep floor insulation, warm roof systems, and high-spec wall builds.