25mm Celotex CW4000 Cavity PIR Cavity Insulation Board represents a high-performance polyisocyanurate (PIR) insulation solution engineered for superior thermal efficiency and low-emissivity foil facing technology. Available across multiple thicknesses from 40mm to 100mm, this product excels in partial fill cavity wall installations.

Please note: Celotex has ceased production of the following thicknesses: 25mm, 55mm, 65mm, 70mm, 80mm and 90mm. Contact us for a quotation to find a suitable alternative product.

Product specification

• Brand: Celotex®
• Model: 25mm CW4025
• Thickness: 25mm
• Length: 1200mm
• Width: 450mm
• Pack quantity: 20
• Board Coverage: 0.54m2
• Pack Coverage: 10.80m2
• Dimensions: 1,200mm x 450mm x 25mm
• R-Value: 1.10m2K/W
• Thermal Conductivity: 0.022 W/mk
• Density: 30Kg/m3
• Material: PIR Insulation (polyisocyanurate)
• Profile: Improved thermal performance
• Vapour Resistivity: 100 MNs/gm
• Building Regulations: Compliant
• Finish: Foil facings
• Shipping method: Articulated Vehicle
• Applications: Cavity Walls ǀ Masonry Walls | 25mm Partial fill insulation
• BBA Certified: Yes (no. 16/5343)
• Features: High-performance Cavity Wall Board
• Manufacturer: Celotex CW4000®

Product Features

• Lightweight 1200 x 450mm boards
• Squared edges
• Low emissivity foil facing
• BBA approved – certificate 16/5343 (Masonry Partial Fill Cavity Walls)

Fire Classification

Euroclass F Reaction to Fire classification, according to BS EN 13501-1. Products with this level of classification are not provided with a rating for smoke emission.

Product Benefits

Thermal Performance

This 25mm Celotex CW4000 delivers outstanding thermal efficiency with a thermal conductivity rating of 0.022 W/m.K, enabling thinner insulation layers whilst meeting your target U-values.

High Performance Facer

The integrated low-emissivity foil facing maximises thermal performance within sealed cavity air spaces, delivering improved U-value results.

Easy to Install

These 25mm celotex cavity insulation boards combine lightweight construction with rigid structure, streamlining transport, handling, and installation. They align with standard wall tie spacing for straightforward fitting.

BBA Certified

This 25mm Celotex CW4000 partial fill product carries BBA certification, validating its performance in specified partial fill cavity wall applications when installed and maintained according to certification requirements. Consult the BBA certification documentation for full details and any applicable restrictions.

Key Considerations

When installing 25mm Celotex pir partial fill insulation, verify compliance with current Building Regulations and all relevant national guidance, plus any local or regional standards applicable to your project. Fire safety requirements and height restrictions must be observed throughout.

More Information on 25mm Celotex CW4000 Cavity PIR

• Manufacturer Link: 25mm Celotex CW4000 Cavity PIR
• Browse our full Celotex Insulation range and refine by thickness or coverage using the filters on the left. For product suitability advice or bulk quotations, contact us on +4402038839057 , email sales@insulationbee or use Live Chat - Competitive Celotex Insulation Pricing.