Rockwool 65mm TCB Cavity Barrier

65mm Rockwool TCB Cavity Barrier delivers superior fire protection for timber frame and masonry structures. Engineered to surpass building regulation standards for fire resistance in concealed wall cavities, this product has been tested to withstand up to 60 minutes of fire exposure while maintaining integrity and insulation performance.

Manufactured from non-combustible stone wool and wrapped in protective polythene sleeves, this cavity wall insulation solution provides thermal performance alongside weather protection during construction. The colour-coded sleeves—red for TCB and white for PWCB—enable quick identification on site.

The Rockwool cavity barrier combines fire safety, acoustic flanking prevention, and thermal bypass control in a single product. It also seals perimeter edges effectively, minimising air infiltration and heat loss.

Product specification

• Thickness: 65mm
• Width: 65mm
• Length: 1200m
• Length Coverage: 1.2 LM (linear metre)
• Quantity: 1
• Also Avaiable in packs of: 45
• Thermal Conductivity: 0.038 W/mK
• R-Value: 2.47 m²K/W
• Fire Rating: A1

Key points

• Euroclass A1 non-combustible.
• FLEXI Edge ensures tight friction fit.
• High performing acoustic, thermal and fire protection properties.
• Will not slump, even if studs shrink.
• Zero Ozone Depletion Potential (ODP) and Global Warming Potential (GWP).
• Easy to install
• Fire resistance up to 60 minutes (EI)
• Reduce acoustic flanking transmission
• Improves air leakage & heat loss
• Unaffected by building movement
• Suitable for vertical and horizontal applications
• Site durable & weather protected

Application

The 65mm Rockwool TCB Cavity Barrier performs effectively in both vertical and horizontal configurations. When installed vertically, secure the flanges to the inner leaf at 150mm intervals using staples or clout nails before the outer cavity wall compresses the product. For horizontal installations, fix only the top flange of the polythene sleeve.

Certification

Euroclass A1 fire rating: ROCKWOOL Cavity Barriers meet the highest fire safety standards and have been tested and assessed for up to 60 minutes of fire resistance (both integrity and insulation) in accordance with BS 476: Part 20.

• ISO14001: Compliant with Environmental Management standards.
• EN 13162: Manufactured in accordance with European standards.
• A+ rating on BRE Green Guide: Recognized for excellent environmental performance.

Fire Protection

This cavity barrier product exceeds the minimum Building Regulation requirements for fire resistance in concealed wall cavities, delivering robust protection for both TCB and PWCB applications.

Resilient Performance

The TCB Cavity Barrier maintains consistent performance regardless of building movement, structural shrinkage, or temperature fluctuations, ensuring long-term reliability.

Durability

Designed for robust on-site handling, these barriers provide lifetime structural protection once installed, resisting degradation throughout the building's lifespan.

Vertical or Horizontal Solution

ROCKWOOL Cavity Barriers deliver flexible installation options for both vertical and horizontal placements. Vertical installations allow both flanges to be secured to the inner leaf at 150mm intervals, whilst horizontal applications require only the top flange to be fixed.

Acoustic Protection

ROCKWOOL Cavity Barriers effectively block flanking noise transmission through concealed cavities in external wall insulation and separating walls, enhancing acoustic performance throughout the building.

More Information on 65mm Rockwool TCB Cavity Barrier

• Manufaturer Link: 65mm Rockwool TCB Cavity Barrier
• 170mm Rockwool Partial Fill Cavity Slab is a high-performance brand offering versatile applications.
• Have a browse of our Rockwool Insulation stock and filter by thickness or coverage on the left-hand side of the page. If you'd like to talk through the suitability of some products for your project, or get a quantity discount quotation please call us by phone on +4402038839057 , email sales@insulationbee or Live Chat - Lowest UK Rockwool Insulation Prices.