40mm Soprema SOPRATHERM CW4040 PIR Board

40mm Soprema SOPRATHERM CW4040 (previously Celotex CW4000) delivers high-performance PIR insulation specifically engineered for cavity wall applications, with a thermal conductivity rating of 0.022 W/mK. The aluminium foil-faced construction provides enhanced thermal performance and is BBA certified 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: 40mm SOPRATHERM CW4040 (previously Celotex CW4040)
3. Thickness: 40mm
4. Length: 1200mm
5. Width: 450mm
6. Pack quantity: 14
7. Board Coverage: 0.54m2
8. Pack Coverage: 7.56m2
9. R-Value: 1.80m2K/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 | 40mm Partial fill insulation
20. BBA Certified: Yes (no. 16/5343)
21. Features: High-performance Cavity Wall Board

The 40mm CW4040 PIR board is manufactured to align with standard cavity wall tie spacing, eliminating the need for cutting during most installations. This streamlined approach reduces on-site installation time and labour costs.

When properly installed, Soprema CW4040 supports buildings in achieving UK Building Regulations requirements for energy efficiency and carbon reduction. The product carries BBA certification from the British Board of Agrément, confirming its reliability and thermal 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: The 40mm Soprema CW4000 installs 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 upgrading of existing cavity wall systems.

Reaction to fire

• 40mm SOPRATHERM CW4000 PIR insulation board achieves a Euroclass F reaction to fire rating under BS EN 13501-1.
• Current UK Building Regulations restrict its use in external walls of buildings exceeding 11 m in height due to combustibility standards.
• Specification and installation must comply with all applicable Building Regulations, statutory guidance, and relevant standards.

Standards & Certification

• Thermal conductivity: 0.022W/mK, tested to BS EN 13165 for factory-manufactured rigid polyurethane foam (PU) products
• 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 products. We deliver across the UK Mainland. For project-specific advice, product suitability assessments, or bulk quotations, contact us on 02038839057 / 02038839057, email sales@insulationbee.co.uk or use Live Chat for competitive UK insulation pricing.