Celotex PIR Cavity Wall Insulation 50mm x 450mm x 1.2m

Celotex PIR Cavity Wall Insulation 50mm x 450mm x 1.2m

The Celotex CW4000 PIR Insulation Board is a high-performance, rigid polyisocyanurate (PIR) insulation board developed specifically for use in partial-fill cavity wall applications. With a thickness of 50mm and a narrow width of 450mm, these boards are sized for easy installation between standard wall ties in traditional masonry cavity walls.

Faced with a low emissivity aluminium composite foil on both sides, the boards achieve excellent thermal performance with a lambda value of 0.022 W/m·K, helping reduce heat loss and meet Part L of the Building Regulations.

Key Features:

• Purpose-Built for Cavity Walls
  Slim 450mm width ensures a snug fit between wall ties for quick and effective installation.
• Superior Thermal Performance
  Outstanding thermal conductivity of 0.022 W/m·K, helping to meet and exceed U-value targets in compliance with UK regulations.
• Foil-Faced on Both Sides
  Low emissivity foil layers enhance thermal resistance when used with unventilated cavities, improving the overall insulation performance of the wall.
• Straight Edge Profile
  Ensures tight joints and reduced thermal bridging in cavity wall construction.
• BBA Certified
  Independently assessed and certified under BBA Certificate 24/7312, assuring performance, durability, and compliance.
• Lightweight & Easy to Handle
  Makes transportation and on-site installation faster and more efficient without compromising structural performance.

Technical Specifications:

Typical Applications:

The Celotex CW4000 series is specifically designed for use in:

• Masonry cavity walls in both new build and refurbishment projects
• Partial-fill cavity wall applications where moisture management and insulation are critical
• Residential, commercial, and industrial buildings where high thermal performance is required

Installation Guidelines:

• Boards should be installed in a staggered pattern, with tight butt joints to reduce thermal bridging.
• Ensure wall ties are placed correctly and insulation retaining clips are used where required.
• Leave a residual air cavity (typically 25mm) between the inner face of the outer leaf and the board surface.
• Handle with care to avoid damaging foil facings. Cut with a handsaw or utility knife.

Always follow the latest Celotex CW4000 installation guide and relevant national building regulations.

Frequently Asked Questions (FAQs):

Q: What makes Celotex CW4000 suitable for cavity walls?
A: Its narrow 450mm width allows it to slot neatly between wall ties in masonry cavities, and its low emissivity foil facing enhances thermal performance in unventilated air spaces.

Q: Does the product resist moisture?
A: Yes. The PIR foam core has a closed-cell structure that limits water absorption. It is suitable for partial-fill cavities when installed with proper detailing.

Q: Can it be used in full-fill cavity wall applications?
A: No. CW4000 is specifically designed for partial-fill applications and should not be used in full-fill cavity wall systems.

Q: Is the product environmentally friendly?
A: Yes. Celotex PIR boards are manufactured without CFCs or HCFCs and have a low Global Warming Potential (GWP) and zero Ozone Depletion Potential (ODP).

Q: What is the expected lifespan of this insulation?
A: When correctly installed, it is durable and will remain effective for the life of the building.

Certifications & Compliance:

• BBA Certificate 24/7312
  Confirms compliance with UK Building Regulations for use in defined applications.
• Manufactured to ISO 9001 (Quality Management) and ISO 14001 (Environmental Management) standards.

Warranty Information:

Celotex insulation products come with a standard manufacturer’s warranty that covers defects in materials and workmanship when used and installed as specified. The warranty may vary depending on the supplier, so always consult the product datasheet or contact Celotex directly for specific warranty terms.

Warranty does not cover improper storage, handling, or installation outside the recommended guidance.

Why Choose Celotex CW4000 50mm Cavity Wall Insulation?

• Designed specifically for UK cavity wall widths
• Easy to install and handle
• Helps reduce heating costs and carbon footprint
• Fully certified and tested for long-term performance
• Trusted by professionals in both residential and commercial sectors

Efficient, reliable, and easy to work with – Celotex CW4000 cavity wall boards provide the thermal performance you need for compliant, energy-efficient buildings.