40mm Celotex CW4000 Cavity PIR Cavity Insulation Board delivers exceptional thermal performance through advanced polyisocyanurate (PIR) technology with low emissivity foil facing. Available in thicknesses from 40mm to 100mm, this insulation board is engineered for partial fill cavity wall installations.

Please note: Celotex has ceased production of 25mm, 55mm, 65mm, 70mm, 80mm and 90mm thicknesses. Request a quotation for suitable alternatives.

Product specification

• Brand: Celotex®
• Model: 40mm CW4040
• Thickness: 40mm
• Length: 1200mm
• Width: 450mm
• Pack quantity: 14
• Board Coverage: 0.54m2
• Pack Coverage: 7.56m2
• Dimensions: 1,200mm x 450mm x 40mm
• R-Value: 1.80m2K/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 | 40mm 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 40mm Celotex CW4000 board achieves outstanding thermal efficiency with a thermal conductivity rating of 0.022 W/m.K, allowing thinner insulation layers whilst meeting your target U-values.

High Performance Facer

The low emissivity foil facing significantly boosts thermal performance within sealed cavity air spaces, delivering superior U-value results.

Easy to Install

These 40mm celotex cavity insulation boards are lightweight and rigid, ensuring simple transport, handling, and installation. They're designed to align with standard wall tie spacing for straightforward fitting.

BBA Certified

This 40mm Celotex CW4000 partial fill product carries BBA certification, verifying its performance for specified partial fill cavity wall applications when installed and maintained according to certification requirements. Consult the BBA certification documentation for full details and any limitations.

Key Considerations

When installing 40mm Celotex pir partial fill insulation, verify compliance with current Building Regulations and all relevant national guidance, plus local and applicable construction standards for your specific project. Fire safety requirements and height restrictions must be observed.

More Information on 40mm Celotex CW4000 Cavity PIR

• Manufaturer Link: 40mm 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 pricing enquiries, contact us on +4402038839057 , email sales@insulationbee or use Live Chat - Competitive UK Celotex Insulation Pricing.