75mm Soprema SOPRATHERM CW4075 PIR Board

75mm Soprema SOPRATHERM CW4075 (formerly Celotex CW4000) delivers high-performance thermal insulation for cavity wall applications. This PIR board features a thermal conductivity of 0.022 W/mK and aluminium foil facing, with BBA certification for partial fill cavity wall installations (Certificate 24/7312). Supplied in thicknesses ranging from 50mm to 100mm.

Pack Size & Coverage

1. Brand: Soprema CW4000
2. Model: 75mm SOPRATHERM CW4075 (previously Celotex CW4075)
3. Thickness: 75mm
4. Length: 1200mm
5. Width: 450mm
6. Pack quantity: 8
7. Board Coverage: 0.54m2
8. Pack Coverage: 4.32m2
9. R-Value: 3.40m2K/W
10. Thermal Conductivity: 0.022 W/mk
11. Density: 30Kg/m3
12. Edge profile: Straight edge
13. Vapour Resistivity: 100 MNs/gm
14. Building Regulations: Compliant
15. Material: PIR
16. Finishing top: Alu-kraft
17. Finishing bottom: Alu-kraft
18. Shipping method: Articulated Vehicle
19. Applications: Cavity Walls ǀ Masonry Walls | 75mm Partial fill insulation
20. BBA Certified: Yes (no. 16/5343)
21. Features: High-performance Cavity Wall Board

This PIR board is engineered to align with standard cavity wall tie spacing, eliminating the need for cutting during most installations. This streamlined approach reduces labour time and simplifies on-site fitting procedures.

When properly installed, Soprema CW4075 supports compliance with UK Building Regulations requirements for thermal performance and carbon reduction targets. The product carries BBA certification from the British Board of Agrément, confirming its reliability and thermal characteristics.

Benefits

1. Declared Thermal Conductivity (λD): 0.022 W/mK
2. Nominal Board Dimensions: 2400 x 1200 mm
3. Thickness Range: 40 mm to 100 mm
4. Edge Profile: Straight
5. Aluminium Foil Surface Emissivity: 0.05
6. BBA Certified: Certificate 25/7312 (Partial Fill Cavity Walls)

Application

• Primary Application: Partial-Fill Cavity Walls: 75mm Soprema CW4000 is positioned against the inner masonry leaf, maintaining a standard 50 mm air gap to the outer leaf.
• New Build & Refurbishment: Appropriate for new masonry projects and thermal upgrades to existing cavity wall structures.

Reaction to fire

• 75mm SOPRATHERM CW4000 PIR insulation board achieves Euroclass F reaction to fire rating under BS EN 13501-1.
• Under current UK Building Regulations regarding combustibility, this product cannot be used in external walls of buildings exceeding 11 m in height.
• Installation and specification must comply with all applicable Building Regulations, statutory guidance, and relevant standards.

Standards & Certification

• Thermal conductivity: 0.022W/mK, in accordance with BS EN 13165 for rigid polyurethane foam (PU) products manufactured in factory conditions
• Spread of flame: Euroclass F Reaction to Fire classification per BS EN 13501-1. Products at this classification level do not receive a smoke emission rating.
• BRE Green Guide Rating: A
• Certification: BBA certified

Info

Explore our full range of Sopratherm insulation solutions. We deliver across the UK Mainland. For product suitability advice, project-specific recommendations, or bulk pricing enquiries, contact us on 02038839057 / 02038839057, email sales@insulationbee.co.uk or use Live Chat for competitive UK insulation pricing.