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Acoustic Wall Ties for Internal Separating (Party) Walls

Approved Document E: Resistance to the Passage of Sound specifies the requirements for Type A Wall Ties for use in internal separating walls of new-build attached dwellings.

It states that ties must have a measured dynamic stiffness of less than 4.8MN/m³ to minimise the transfer of sound across a cavity.

Independent tests have proven that the stainless steel wall tie referenced Staifix HRT4 manufactured by Ancon Building Products and which forms part of the company’s low thermal conductivity range, meets this stringent acoustic requirement.


The Staifix HRT4 wall tie is suitable for use in separating walls with a cavity width of 50, 75, 100, 125 and 150mm. The HRT4 can be used with all approved robust details for cavity masonry separating walls, whether traditional or thin-joint blockwork. Use of these details eliminates the need for pre-completion sound testing.

The Staifix range is available from builder’s merchants and other specialist distributors nationwide. The HRT4 is supplied in boxes of 250 ties and bags of 20.

This product is CE marked to BS EN 845. A BIM Object is also available for use in a digital building model.

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