120mm Rockwool TCB Cavity Barrier

120mm Rockwool TCB Cavity Barrier and PWCB Cavity Barrier products deliver outstanding fire protection for timber frame and masonry structures. These barriers exceed building regulation standards for fire resistance in concealed wall cavities, with proven performance for up to 60 minutes of integrity and insulation.

Made from non-combustible stone wool and wrapped in protective polythene sleeves, these cavity wall insulation products provide thermal protection and weather resistance during fitting. Colour-coded sleeves—red for TCB and white for PWCB—make identification straightforward.

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

Product specification

• Thickness: 120mm
• Length: 1200m
• Length Coverage: 1.2 LM (linear metre)
• Quantity: 1
• Also Avaiable in packs of: 15
• 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 120mm Rockwool TCB Cavity Barrier suits both vertical and horizontal placements. For vertical installations, secure the flanges to the inner leaf at 150mm intervals using staples or clout nails before the outer cavity wall compresses them. In horizontal applications, 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

The 120mm Rockwool TCB Cavity Barrier and PWCB Cavity Barrier products surpass minimum Building Regulation requirements for fire resistance in concealed wall cavities.

Resilient Performance

These barriers remain unaffected by building movement, shrinkage, or thermal variations, maintaining reliable performance throughout their service life.

Durability

Designed to withstand on-site handling, these barriers provide lasting protection once installed, enduring for the full lifetime of the building.

Vertical or Horizontal Solution

ROCKWOOL Cavity Barriers work effectively in both vertical and horizontal applications. Vertical installations allow both flanges to be secured to the inner leaf at 150mm intervals, while horizontal applications require only the top flange of the polythene sleeve to be fixed.

Acoustic Protection

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

More Information on 120mm Rockwool TCB Cavity Barrier

• Manufaturer Link: 120mm Rockwool TCB Cavity Barrier
• Browse our Rockwool Insulation range and refine by thickness or coverage using the left-hand filters. For project suitability advice or bulk pricing, contact us on +4402038839057 , email sales@insulationbee or use Live Chat - Best UK Rockwool Insulation Prices.