25mm Celotex CW4000 Cavity PIR Cavity Insulation Board is a user-friendly polyisocyanurate (PIR) insulation board known for its superior thermal performance and low emissivity foil facing. It comes in various thicknesses ranging from 40mm to 100mm, making it ideal for use in partial fill cavity wall applications.

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: 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

25mm Celotex CW4000 offers excellent thermal performance with a thermal conductivity of 0.022 W/m.K, reducing the necessary insulation thickness to achieve target U-values.

High Performance Facer

The low emissivity foil facing enhances thermal performance in sealed cavity air spaces, improving the achievable U-value.

Easy to Install

These 25mm celotex cavity insulation boards are lightweight and rigid, making transportation, handling, and fitting straightforward. They are designed to fit standard wall tie spacing for hassle-free installation.

BBA Certified

25mm Celotex CW4000 partial fill is BBA certified, confirming its suitability for defined partial fill cavity wall applications when installed, used, and maintained as specified in the certificate. Please refer to the BBA certification page for comprehensive details and restrictions.

Key Considerations

When using 25mm Celotex pir partial fill insulation, ensure that the product complies with all relevant national Building Regulations and guidance, as well as local, national, and other applicable standards for your construction or application. This includes adhering to fire safety requirements and applicable height restrictions.

More Information on 25mm Celotex CW4000 Cavity PIR

• Manufaturer Link: 25mm Celotex CW4000 Cavity PIR
• Have a browse of our Celotex Insulation stock and filter by thickness or coverage on the left-hand side of the page. If you’d like to talk through the suitability of some products for your project, or get a quantity discount quotation please call us by phone on +4402039519012 , email sales@insulationstoreonline or Live Chat - Lowest UK Celotex Insulation Prices.