85mm Celotex CW4000 Cavity PIR Cavity Insulation Board delivers outstanding thermal efficiency through advanced polyisocyanurate (PIR) technology with low emissivity foil facing. Available in thicknesses from 40mm to 100mm, this insulation board excels in partial fill cavity wall installations.

Celotex has discontinued the following thicknesses: 25mm, 55mm, 65mm, 70mm, 80mm and 90mm. Click to request a quotation and we will recommended an equivalent product.

Product specification

• Brand: Celotex®
• Model: 85mm CW4085
• Thickness: 85mm
• Length: 1200mm
• Width: 450mm
• Pack quantity: 7
• Board Coverage: 0.54m2
• Pack Coverage: 3.78m2
• Dimensions: 1,200mm x 450mm x 85mm
• R-Value: 3.85 m2K/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 | 85mm 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 85mm Celotex CW4000 solution provides exceptional thermal resistance with a thermal conductivity rating of 0.022 W/m.K, allowing you to minimise board thickness whilst meeting your target U-values effectively.

High Performance Facer

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

Easy to Install

These 85mm celotex cavity insulation boards combine lightweight construction with rigid stability, simplifying transport, handling, and installation. They're engineered to align with standard wall tie spacing for seamless fitting.

BBA Certified

85mm Celotex CW4000 partial fill carries full BBA certification, validating its performance in specified partial fill cavity wall applications when installed and maintained according to certificate requirements. Consult the BBA certification documentation for full details and any limitations.

Key Considerations

When installing 85mm Celotex pir partial fill insulation, verify compliance with all relevant Building Regulations, fire safety standards, and applicable height restrictions for your specific location and project type.

More Information on 85mm Celotex CW4000 Cavity PIR

• Manufaturer Link: 85mm Celotex CW4000 Cavity PIR
• Explore our full range of Celotex Insulation products, filtering by thickness or coverage area to find your ideal solution. For expert guidance on product suitability, bulk pricing, or technical queries, contact us via phone on +4402038839057 , email sales@insulationbee or Live Chat - Lowest UK Celotex Insulation Prices.