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
New EPDs for Key Product Ranges
Environmental Product Declarations (EPDs) covering two key masonry support and restraint solutions from our trusted Ancon product range are now available. Architects, engineers and contractors can now access these verified documents which provide clear, comparable data on the full lifecycle impact of our products.
New Ancon Staifix Packaging: Built for strength, designed for clarity
Leviat’s brand refresh of its established Ancon Staifix range introduces bold, fresh, and sustainable new packaging – designed for visibility, strength, and reliability.