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ROCKWOOL® TCB Cavity Barrier

Preventing fire spreading through concealed voids is essential for improving safety and property protection. One of the best ways to achieve this is to correctly specify and install cavity barriers.

ROCKWOOL Cavity Barriers have been specifically developed to exceed minimum building regulation requirements for fire resistance in concealed wall cavities. They have been tested and assessed for up to 60 minutes fire resistance (Integrity and insulation).

Rockwool insulation products do not contain blowing agents with an ozone depletion potential (ODP) or global warming potential (GWP), are CFC-HCFC-HFC free and 97% recyclable. Compatible with most materials with which it is likely to come into contact in normal building and industrial applications. Will not react with metal components or cause loss of plasticiser from PVC cables and pipes.


  • Easy to install.
  • Durable products withstand on-site handling.
  • Once installed, performance is not affected by movement in the building, shrinkage or thermal change.
  • Can be used vertically or horizontally.
  • Non-combustible.

General information


Can be used in both vertical and horizontal applications


Non-combustible stone wool encapsulated within a resilient polythene sleeve incorporating two flanges

Uniclass 2015

Pr_25_80_80_79 Sleeved mineral wool cavity barriersPrimary


F30/18 Cavity closers

F30/180 Cavity closers

K10/530 Cavity fire barriers within partitions/ wall linings

P10/420 Sleeved mineral wool small cavity barriers

P10/70 Sleeved small cavity barriers

P10/75 Wired small cavity barriers

Specification data - Sleeved mineral wool cavity barriers

Product Reference

ROCKWOOL TCB Cavity Barrier

ROCKWOOL PWCB Cavity Barrier


1200 mm

To suit cavity width

50 – 55 mm

56 – 65 mm

70 – 80 mm

90 – 100 mm

101 – 110 mm

111 – 120 mm

121 – 130 mm

131 – 140 mm

141 – 150 mm


+5/10 mm cavity width


200 mm


Standard product features


Non-combustible, achieving a classification of A1 in accordance with BS EN 13501-1.

The Cavity Barriers have been tested and assessed for up to 60 minutes fire resistance (integrity and insulation) in accordance with BS 476: Part 20.

Rockwool Cavity Barriers comply with the generic description for cavity closers to prevent flanking noise transmission, along concealed cavities in both external and separating walls.

Digital objects
PlatformCompatibleVersionCertified to
IFC2X3 3 1.3
Revit 2016 4 2.0
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