PWTIMFRSTOP 60-Minute Fire-Rated Party Wall Cavity Stop Sock Timber-Masonry

• PWTIMFRSTOP cavity stop socks comprise a length of non-combustible mineral wool insulation sleeved in a polythene outer layer for on-site weather protection
• 60-minute fire integrity and insulation performance
• Sized to cover a maximum party wall
• Available to suit cavity widths from 50mm up to 150mm

• Complies with Building regulations Approved Document B and Robust Detail part E
• Independently tested by Warringtonfire in accordance with EN1366-4 principles
• Satisfies NHBC technical requirements
• Manufactured using mineral wool insulation classified as Euroclass A1 for fire according to BS EN 13501-1
• Mineral wool insulation is compliant with BS EN 13162 Thermal insulation products for buildings, ISO 50001 Energy Management Systems, ISO 14001 Environmental Management Systems and ISO 9001 Quality Management Systems
• The product contains no CFCs, HCFCs, or other ozone-depleting substances

• The thermal conductivity of the Mineral wool insulation is 0.037 W/mK
• Supplied in 1200mm lengths
• For individual product colours refer to the product code table

Uniclass: Pr_25_80_81_51 Mineral wool fire-stopping
CAWS: P12/360 Mineral wool rigid batts | P12/40 Mineral wool rigid batts

• Manufacturer: Timloc Building Products, Timloc House, Ozone Park, Howden, East Yorks. DN14 7SD. T: 01405 765 567 W: www.timloc.co.uk
• Reference: PWTIMFRSTOP
• Types(s) and location(s): Thermal and acoustic fire stops to be installed vertically and horizontally as work proceeds. Position at party wall to cavity wall junctions or at floor level. Supplied in 1200mm lengths and butt jointed.
• Colour: Red

PWTIMFRSTOP can be installed via one of two methods:

A) Direct fix via polythene flanges to the timber frame:

• Secure each length of PWTIMFRSTOP to the timber frame through the polythene flanges with clout nails or staples spaced 150mm apart.
• To install in the vertical direction apply nails or staples to the flanges on both sides of the product
• To install in the horizontal direction apply nails or staples to the flange on the top edge of the product only
• The construction of the outer leaf can then be completed, ensuring that the cavity width is correct and maintains compression to the PWTIMFRSTOP lengths

B) Compression fit between the inner and outer leaf as brick courses progress upwards:

• Build up the inner and outer leaf to the level at which the PWTIMFRSTOP will be situated
• Check that the cavity width is correct to specification and will provide a compression fit onto the PWTIMFRSTOP lengths
• Ensure that the mortar of the brick work is set then insert the PWTIMFRSTOP lengths into the cavity between the inner and outer leaf

General Installation Notes

• Ensure that the PWTIMFRSTOP lengths fully fill the cavity with an even amount of compression on both sides
• At junctions the lengths of PWTIMFRSTOP should be cut to the appropriate length and butt jointed firmly to the next length or to the supporting construction
• When trimming the lengths any excess polythene should also be trimmed and folded back over to maintain the site weather protection
• Do not bend or deform the lengths to fit into the cavity around corners or junctions as this will damage the mineral wool insulation
• The polythene outer layer does not contribute to the fire rating of the PWTIMFRSTOP it is only used to aid the installation via the flanges and provide site weather protection. If the polythene becomes pierced or torn the stop sock will still function as intended
• If the mineral wool insulation in one of the PWTIMFRSTOP lengths is broken or damaged before installation then it should be discarded and replaced with another undamaged length
• When installed horizontally a preformed horizontal cavity tray should be incorporated into the cavity wall construction (refer to technical department for the appropriate type to suit) and proprietary wall weep vents (1143) spaced at 900mm centres to prevent water ingress from bridging the cavity

To calculate required quantities:

• Divide the overall length of the cavity wall run (measured in mm) by 1200mm
• Allow one additional length for each corner for trimming
• Determine and specify the cavity width that the product needs to fit into