Important Information: For all updates and Celotex announcements since June 2017, please see the links below...  See more

Declared lambda values - Read more >

5000 Class 0 testing - Read more >

Rainscreen cladding & RS5000 - Read more >

Celotex US4000

High performance floor perimeter upstand insulation Celotex US4025 is suitable for concrete slab, beam & block and underfloor heating flooring applications when using Celotex FI5000

Product Image
U-value Calculator
Start your U-value calculation >
Use the calculator

IMPORTANT: We have recently identified a compliance issue relating to our calculation and testing of the lambda value of products in our 4000 and 5000 range and the Crown-Bond and Crown-Fix products within Crown Flat Roofing range. Please note that US4000 manufactured after 15 December 2017 will be marketed from January as Celotex US3000 with a declared lambda value of 0.023 W/mK. 

Please use the link below to read our full statements regarding declared lambda:

Read more > Calculator Icon

Celotex US4025 is our premium performance PIR solution for floor perimeter upstands suitable for use with Celotex FI5000.

Celotex US4025 is manufactured from rigid polyisocyanurate (PIR) using a blowing agent that has zero ozone depletion potential (ODP) and a low global warming potential (GWP).

  • Board size: 1200 x 2400mm
  • Thickness : 25mm
  • Lambda: 0.022 W/mK
  • Facer: bi-laminate

With Celotex US4025 you are specifying an insulation board that achieves the following:

  • Low thermal conductivity value of 0.022W/mK
  • Designed to limit the thermal bridge at floor junctions
  • Has a compressive strength value of ≥120 kPa
  • Is easy to cut and install

Calculate Your U-values Calculator Icon