T-Barrier for Pitched Roof

Fire product

ARC T-Barrier Pitched Roof

  • Provides fire stopping at the head of a block party wall
  • Complies with NHBC 2017 7.2.16
  • Held in position by compression fit within the party wall cavity
  • Sits in compression directly under the roofing membrane


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. The product is fitted along the length of the roof pitch, from soffit to apex ensuring an effective and consistent barrier.

The ARC T-Barrier Pitched Roof is easily installed once the party wall blockwork is complete, with the unique T-shape being held in place by compression between the two leaves of party wall blockwork.

Key stats

Length supplied 1.2m
Insulation Rockfibre mineral wool
Thermal conductivity 0.037W/mK
Test standard BS 476: Part 20: 1987 and BSEN 1366-4: 2006

Frequently asked questions about this product

Can this product be used with a flat roof?

Yes, ARC T-Barrier Pitched Roof can be used with either a pitched or flat roof, provided there is a party wall with a cavity, and a 25mm gap between the top of the wall and underside of the roof.

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