Timber Frame Party Wall Cavity Barrier 551

Timber Frame Party Wall Cavity Barrier 551

Timber Frame Party Wall Cavity Barrier 551 has been designed to prevent passage of fire through concealed voids within the external fabric of a timber frame building, but more specifically where the junction is formed between the external cavity and the party wall cavity.

The Barrier helps in reducing flanking sound transmission at separating wall junctions and is suitable for positioning vertically at compartment wall/party wall locations.

Timber Frame Party Wall Cavity Barrier 551 assists in satisfying the requirements of guidance documents such as Approved Document B and The Scottish Technical Handbook.

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Specifications

  • Tested and assessed to the general principles of BS 476 Part 20: 1987
  • Suitable for vertical application
  • Provides up to 120 minutes fire resistance performance
  • Accommodates a maximum void of 175mm
  • Designed for installation within masonry/timber frame cavities at the junction between the external cavity and party wall cavity
  • Manufactured in bespoke sizes to suit the specified cavity width

Product Performance

551 T2

Timber Frame Party Wall Cavity Barrier 551 has been tested and assessed to the general principles of BS476 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 143454 Issue 3). Consideration must be given towards the overall width of the party wall construction – please contact Mayplas for further technical guidance.

Installation

  • Suitable for installation against timber substrates
  • Easy installation process
  • 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 Party Wall 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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