50mm Soprema SOPRATHERM CW4050 PIR Board

50mm Soprema SOPRATHERM CW4050 (previously Celotex CW4000) delivers high-performance thermal insulation for cavity wall applications with a thermal conductivity rating of 0.022 W/mK. The aluminium foil-faced surface enhances thermal efficiency, and the product holds BBA certification for partial fill cavity wall installations (Certificate 24/7312). Thickness options range from 50mm to 100mm to suit various project requirements.

Pack Size & Coverage

1. Brand: Soprema CW4000
2. Model: 50mm SOPRATHERM CW4050 (previously Celotex CW4050)
3. Thickness: 50mm
4. Length: 1200mm
5. Width: 450mm
6. Pack quantity: 11
7. Board Coverage: 0.54m2
8. Pack Coverage: 5.9m2
9. R-Value: 2.25m2K/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 | 50mm Partial fill insulation
20. BBA Certified: Yes (no. 16/5343)
21. Features: High-performance Cavity Wall Board

This PIR insulation board is engineered to align with standard cavity wall tie spacing, eliminating the need for cutting during most installation scenarios. This design feature streamlines the installation process and reduces labour time on-site.

When properly installed, Soprema CW4050 helps properties achieve UK Building Regulations compliance for energy efficiency and carbon reduction targets. The British Board of Agrément certification confirms the product meets rigorous quality and performance standards.

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: This 50mm product installs against the inner masonry leaf, maintaining a standard 50 mm air gap to the external leaf.
• New Build & Refurbishment: Suitable for both new masonry constructions and thermal upgrades to existing cavity wall systems.

Reaction to fire

• 50mm SOPRATHERM CW4000 PIR insulation board achieves Euroclass F reaction to fire classification under BS EN 13501-1.
• Current UK Building Regulations restrict use in external walls exceeding 11 m height due to combustibility requirements.
• Installation must comply with all relevant Building Regulations, statutory guidance, and applicable standards.

Standards & Certification

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

Info

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