50mm Celotex CW4000 Cavity PIR Cavity Insulation Board delivers exceptional thermal efficiency with its polyisocyanurate (PIR) construction and premium low emissivity foil facing. Available in thicknesses from 40mm to 100mm, this insulation board is purpose-designed for 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: 50mm CW4050
• Thickness: 50mm
• Length: 1200mm
• Width: 450mm
• Pack quantity: 11
• Board Coverage: 0.54m2
• Pack Coverage: 5.94m2
• Dimensions: 1,200mm x 450mm x 50mm
• R-Value: 2.25m2K/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 | 50mm 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 50mm Celotex CW4000 board achieves outstanding thermal efficiency through its 0.022 W/m.K thermal conductivity rating, allowing you to meet target U-values with minimal insulation depth.

High Performance Facer

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

Easy to Install

These 50mm celotex cavity insulation boards combine lightweight construction with rigid strength, ensuring simple handling and installation. Standard wall tie spacing compatibility makes fitting quick and straightforward.

BBA Certified

This 50mm Celotex CW4000 partial fill product carries BBA certification, validating its performance for specified partial fill cavity wall applications when installed according to certificate requirements. Review the BBA certification documentation for full details and any restrictions.

Key Considerations

When installing 50mm Celotex pir partial fill insulation, verify compliance with current Building Regulations, fire safety standards, and applicable height restrictions for your location and project type.

More Information on 50mm Celotex CW4000 Cavity PIR

• Manufaturer Link: 50mm 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, quantity discounts, or technical guidance, contact us via phone on +4402038839057, email sales@insulationbee, or use our Live Chat service for the best Celotex Insulation prices in the UK.