Timber Frame Cavity Barrier 551

Timber Frame Cavity Barrier 551

Timber Frame Cavity Barrier 551 has been designed to prevent passage of fire through concealed voids within the external fabric of a timber frame building.

The Barrier is suitable for both vertical and horizontal positioning to the edge of cavities, around penetrations, at separating compartment lines and to sub-divide cavities.

Timber Frame Cavity Barrier 551 assists in satisfying requirements of guidance documents such as Approved Document B and The Scottish Technical Handbook and will also assist in reducing flanking sound transmission at wall and floor junctions.

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Specifications

  • Tested and assessed to the general principles of BS 476 Part 20: 1987
  • Suitable for both vertical and horizontal orientation
  • Solutions available offering either 60 minutes or 120 minutes fire resistance performance
  • Accommodates a maximum void of 175mm
  • Designed for installation within masonry/timber frame cavities
  • Manufactured in bespoke sizes to suit the specified cavity width

Product Performance

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Timber Frame Cavity Barrier 551 has been tested and assessed to the general principles of BS 476 Part 20: 1987 by Exova Warringtonfire.

The fire resistance performance is based on the barrier being installed against a suitable timber framed construction (Report WFRC C68305 & WFRC 143454 Issue 3).

Installation

  • Easy installation process
  • Designed for installation within masonry/timber frame cavities
  • Suitable for installation against timber substrates
  • Installed under compression – the barrier is stapled to the inner timber substrate prior to brickwork being erected and is compressed into the cavity
  • For voids up to 150mm a minimum compression of 15mm is required, thereafter 20mm compression is required up to the maximum void of 175mm
  • When installing Timber Frame Cavity Barrier 551 it may be necessary to consider additional use of DPC’s and/or cavity trays in relevant with Building Control guidance

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