90mm Rockwool PWCB Cavity Barrier

90mm Rockwool PWCB Cavity Barrier products deliver outstanding fire protection for timber frame and masonry structures. 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 barriers provide thermal and weather protection throughout installation. 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 control, and thermal bypass prevention in one solution. It also seals perimeter edges effectively, minimising air leakage and heat loss.

Product specification

• Thickness: 90mm
• Width: 200mm
• Length: 1200m
• Length Coverage: 1.2 LM (linear metre)
• Quantity: 1
• Also Avaiable in packs of: 12
• 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.
• 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

90mm Rockwool PWCB Cavity Barrier suits both vertical and horizontal installations. 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 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

90mm Rockwool PWCB Cavity Barrier has been engineered to surpass the minimum Building Regulation requirements for fire resistance within concealed wall cavities.

Resilient Performance

The PWCB Cavity Barrier remains unaffected by building movement, shrinkage, or thermal changes, guaranteeing dependable performance throughout the building's lifespan.

Durability

These barriers withstand on-site handling and deliver lifetime protection once installed, safeguarding your structure for decades to come.

Vertical or Horizontal Solution

ROCKWOOL Cavity Barriers work in both vertical and horizontal applications. For vertical installations, secure both flanges to the inner leaf at 150mm intervals, whilst horizontal applications require fixing only the top flange of the polythene sleeve.

Acoustic Protection

ROCKWOOL Cavity Barriers prevent flanking noise transmission along concealed cavities in external wall insulation and separating walls, creating a quieter indoor environment.

More Information on 90mm Rockwool PWCB Cavity Barrier

• Manufaturer Link: 90mm Rockwool PWCB 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.