Soprema CW4000 FF (Full Fill Cavity Wall Insulation Board) 1190mm x 450mm

• Rigid PIR insulation board – High-performance thermal insulation for full fill cavity walls
  
• Low emissivity aluminium foil facing – Can be installed full fill or with up to 10mm residual cavity
  
• Thickness 90mm – Thermal resistance RD 4.05 m²·K/W – Suits standard cavity wall designs
  
• Thickness 115mm – Thermal resistance RD 5.20 m²·K/W – Suits deeper cavity wall designs
  
• Thickness 140mm – Thermal resistance RD 6.35 m²·K/W – Provides maximum thermal performance
  
• Tongue and groove edge profile – Ensures tight-fitting installation and reduces thermal bridging
  
• Compressive strength: 120 kPa at 10% deformation – Strong and durable for standard wall construction
  
• Dimensional stability – DS(70,90)3; DS(-20,-)1 (EN 1604)
  
• Reaction to fire: Class F – Tested to EN 13501-1
  
• Certified to BBA 24/7312 PS4 – Confirms compliance with UK building standards
  
• Safe for health and environment – Contains no harmful substances; meets hygiene and safety requirements
  
• Manufactured to EN ISO 9001 quality standards – Independently monitored quality assurance

Cavity Walls

Soprema CW4000 FF is used in cavity walls as thermal insulation. It is designed for full fill cavity wall applications and can be installed with up to a 10 mm residual cavity to accommodate mortar squeeze, or as a full fill solution with no residual cavity. The boards feature a low emissivity aluminium composite foil facing on both sides to enhance thermal performance.

What is Soprema CW4000 FF?

Soprema CW4000 FF is a rigid thermal insulation board manufactured from polyisocyanurate (PIR) foam. It is faced on both sides with a low emissivity aluminium composite foil and is designed primarily for use in full fill cavity wall applications.

How is Soprema CW4000 FF installed in cavity walls?

Soprema CW4000 FF is designed for full fill cavity wall applications. It can be installed as a full fill solution with no residual cavity or with up to a 10mm residual cavity to support ease of installation and accommodate mortar squeeze. After installation, the boards must be protected against weather conditions and sunlight. Always consult local regulations and the manufacturer for technical guidance.

What are the thermal performance properties of Soprema CW4000 FF?

Soprema CW4000 FF has a declared thermal conductivity (λD) of 0.022 W/mK (EN 12667). Thermal resistance (RD) values vary by thickness:

• 90mm: 4.05 m²K/W
  
• 115mm: 5.20 m²K/W
  
• 140mm: 6.35 m²K/W
  

The low emissivity foil facing also contributes to thermal performance within cavity wall constructions.

What sizes and edge profile does Soprema CW4000 FF come in?

Soprema CW4000 FF boards have nominal dimensions of 1205mm x 465mm with a tongue-and-groove edge profile. They are available in thicknesses of 90mm, 115mm, and 140mm. Boards should be stored flat, kept dry, and protected from sunlight prior to installation.