Skip to content

Wall Ties & Restraint Fixings

Approved Document E

Approved Document E: Resistance to the Passage of Sound

This document specifies the acoustic performance requirements of ties suitable for use in separating walls (Type A ) and external walls (Type B) of new build dwellings.

Type A ties must have a measured dynamic stiffness of <4.8MN/m3 for the specified minimum cavity, at a standard density.

Type A ties throughout the site are indicated by this logo e.g. Ancon Staifix HRT4, ACOU Acoustic Wall Tie Range.

Staifix HRT4

Ancon Staifix HRT4

All Ancon ties which cross a cavity meet the requirements of Type B.

How the dynamic stiffness of wall ties is measured

The ends of six samples of each tie are cast into 100mm square concrete blocks, the blocks are suspended, one block excited and the frequency response measured. From these tests the mean dynamic stiffness is calculated for the specific cavity and multiplied by the tie density (usually 2.5 tie/m2). The results are shown in MN/m3.

BIM Objects

CAD Drawings

Latest News

Leviat ensures HS2 tunnel construction remains on track with the creation of rebar facility

The Skanska Costain STRABAG joint venture (SCS JV) turned to Leviat for training, specialist equipment and ongoing support in order to create an on-site steel threading facility capable of producing the required 92,000 rebar couplers. This innovative and cost-effective rebar facility removes the risk of delays, enables new jobs, reduces lorry movements and cuts waste.