T-Barrier for Masonry Construction

Fire product

ARC T-Barrier for Masonry

  • Up to four hours fire integrity
  • Seals edge of party wall cavity
  • Zero U-Value at party wall can be achieved
  • Up to three times more effective as an edge seal than conventional systems
  • Reduces flanking noise
  • Minimises thermal bypass
  • Easy to install


ARC T-Barrier enables the closing of an external cavity at a party wall junction where building regulations require the use of a mineral wool closer for acoustic insulation purposes. Additionally, it provides an effective edge seal around the party wall cavity, helping to achieve a zero U-value.

Key stats

Length supplied 1.2m
Insulation Rockfibre mineral wool insulation
Thermal Conductivity 0.037W/mK
Fire rating Up to 4 hours
Test standard BS 476: Part 20: 1987 and BSEN 1366-4: 2006
Construction type Masonry

Frequently asked questions about this product

How do you install T-Barrier for Masonry Construction?

Please follow the guidance on our datasheet.

Industry awards and accreditations for this product

Other products you may be interested in

ARC Building Solutions

Fire product

Cavity Stop Sock

ARC Cavity Stop Sock restricts the spread of smoke and flames within the cavity of external masonry walls.

Product details

Fire product

T-Barrier for Pitched Roof

The ARC T-Barrier Pitched Roof is designed to provide a fire, thermal and acoustic barrier between the top of the party wall blockwork and the underslaters felt.

Product details

Fire product


ARC U-Barrier is compressed between the top of the spandrel panel and underside of the roof covering, creating a fire and thermal break.

Product details

Cold Bridging product

Eaves Insulator

The requirement for ARC Eaves Insulator elevated from the problem of heat loss through the roof membrane at the junction between the pitched roof and the top of the cavity wall.

Product details