75mm Rockwool TCB Cavity Barrier

75mm Rockwool TCB Cavity Barrier and PWCB Cavity Barrier products deliver outstanding fire protection for timber frame and masonry constructions. These barriers exceed building regulation standards for fire resistance in concealed wall cavities, with proven performance 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 and weather protection during installation. 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 effectively, minimising air leakage and heat loss.

Product specification

• Thickness: 75mm
• Width: 75mm
• Length: 1200m
• Length Coverage: 1.2 LM (linear metre)
• Quantity: 1
• Also Avaiable in packs of: 35
• 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

Install 75mm Rockwool TCB Cavity Barrier vertically or horizontally with confidence. For vertical applications, secure the flanges to the inner leaf at 150mm intervals using staples or clout nails before the outer cavity wall compresses them. In horizontal installations, fasten 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

75mm Rockwool TCB Cavity Barrier and PWCB Cavity Barrier products exceed the minimum Building Regulation requirements for fire resistance within concealed wall cavities.

Resilient Performance

Building movement, shrinkage, and thermal changes have no impact on TCB and PWCB Cavity Barriers, guaranteeing reliable performance throughout the building's lifespan.

Durability

Designed for robust on-site handling, these barriers withstand the test of time once installed, delivering lifetime structural protection.

Vertical or Horizontal Solution

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

Acoustic Protection

ROCKWOOL Cavity Barriers stop flanking noise transmission through concealed cavities in external wall insulation and separating walls, creating better acoustic comfort.

More Information on 75mm Rockwool TCB Cavity Barrier

• Manufaturer Link: 75mm Rockwool TCB Cavity Barrier
• 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.