Celotex XR4000 Insulation

  • Wall, roof and floor insulation board
  • BBA Approved
  • Thermal conductivity: 0.022W/(m2K)
  • Size of boards: 1200 x 2400mm

Celotex XR4000 PIR Insulation

Celotex XR4000 is a high performance, rigid polyisocyanurate (PIR) insulation material, suited for use with wall, floor and roof insulation systems. This PIR insulation is manufactured using a blend of blowing agents that have zero ozone depletion potential and therefore a low environmental impact and global warming potential (GWP). Celotex XR4000 helps to maintain a thermal envelope around the entirety of the building, working to prevent thermal bridging and cold spots. Celotex XR4000 is BBA Approved and creates a durable, long-term solution that will ensure energy-saving benefits.

Celotex XR4000 has low emissivity aluminium foil facings to offer improved thermal performance. The insulation is easy to handle and can be cut to fit.

Technical Specification

  • Composition: rigid polyisocyanurate with low emissivity foil facings
  • Thermal Conductivity: 0.022W/(m2K)
  • Reaction to Fire: Class 1
  • Size of boards: 1200 x 2400
  • Thickness: 150mm, 140mm, 120mm
  • Compressive strength: 120kPa


Celotex XR4000 insulation boards provide the second layer solution for two-layer installations such as between and under rafters and joists, and between and over studs. This insulation is suitable for a number of applications, including:

  • Pitched Roofs
  • Flat Roofs
  • Solid masonry walls
  • Timber framed & steel framed systems
  • Floors


Shelf life: please see the manufacturer’s date of expiry. Keep in a dry place, in the original packaging. Avoid excess heat or UV light exposure.

Safety Measures

Wear eye protection, gloves and a mask. Take extra caution when using cutting equipment.


120mm, 140mm, 150mm


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