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.
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.
Latest News
Leviat Launches New 300mm Type 4 Wall Tie for Wider Cavities
Leading construction accessories manufacturer, Leviat, announces the release of its new Ancon Staifix HRT4 300mm Wall Tie designed for use in wider walls with cavities ranging from 151-175mm. The addition of this product to the existing range will help specifiers and builders to meet the latest Part L regulations and achieve the more stringent U-values and building fabric requirements in the upcoming Future Homes Standard.
Enhanced Ancon IHR Head Restraints Now Accommodate 100mm Gaps Due to Customer Demand
Due to customer demand and changes to fire regulations, Leviat have successfully re-engineered the Ancon IHR range of internal head restraints, now accommodating gaps at the wall head of up to 100mm, extending the previous maximum of 75mm.