140mm Rockwool PWCB Cavity Barrier

140mm Rockwool PWCB Cavity Barrier products deliver superior fire protection for timber frame and masonry construction. These barriers exceed minimum building regulation standards for fire resistance in concealed wall cavities, with proven performance up to 60 minutes of integrity and insulation.

Manufactured from non-combustible stone wool and wrapped in protective polythene sleeves, these cavity wall insulation solutions offer thermal protection and weather resistance during construction. Colour-coded sleeves—red for TCB and white for PWCB—enable quick product identification on site.

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

Product specification

• Thickness: 140mm
• Width: 200mm
• Length: 1200m
• Length Coverage: 1.2 LM (linear metre)
• Quantity: 1
• Also Available in packs of: 7
• Thermal Conductivity: 0.038 W/mK
• R-Value: 2.47 m²K/W
• Fire Rating: A1
• Fire Resistance: Up to 60 minutes

Key points

• Euroclass A1 non-combustible material.
• FLEXI Edge technology ensures secure friction fit.
• Outstanding acoustic, thermal and fire protection performance.
• Resists slumping even when timber studs shrink.
• Zero Ozone Depletion Potential (ODP) and Global Warming Potential (GWP).
• Simple installation process.
• Fire resistance up to 60 minutes (EI).
• Minimises acoustic flanking transmission.
• Reduces air leakage and heat loss.
• Maintains performance despite building movement.
• Works in vertical and horizontal orientations.
• Weather-protected and site-durable.

Application

140mm Rockwool PWCB Cavity Barriers suit both vertical and horizontal installations. For vertical applications, secure both 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, tested and certified for up to 60 minutes of fire resistance (integrity and insulation) to BS 476: Part 20.

• ISO14001: Meets Environmental Management standards.
• EN 13162: Manufactured to European standards.
• A+ rating on BRE Green Guide: Recognised for outstanding environmental credentials.

Fire Protection

140mm Rockwool PWCB Cavity Barriers surpass minimum Building Regulation requirements for fire resistance in concealed wall cavities.

Resilient Performance

These barriers remain unaffected by building movement, timber shrinkage, or thermal fluctuations, guaranteeing reliable long-term performance.

Durability

Designed to withstand on-site handling and installation stresses, these barriers provide protection throughout the building's lifespan.

Vertical or Horizontal Solution

ROCKWOOL Cavity Barriers deliver flexibility for both vertical and horizontal use. Vertically, secure both flanges to the inner leaf at 150mm intervals. Horizontally, fix only the top flange of the polythene sleeve.

Acoustic Protection

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

More Information on 140mm Rockwool PWCB Cavity Barrier

• Manufacturer Link: 140mm Rockwool PWCB Cavity Barrier
• Browse our complete Rockwool Insulation range and refine by thickness or coverage using the left-hand filters. For product suitability advice or bulk quotations, contact us on +4402038839057, email sales@insulationbee, or use Live Chat for the best UK Rockwool Insulation prices.