![](/rails/active_storage/representations/redirect/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBBYk09IiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--dd89e6a09d23d3aaffafed6f1de4c44a6c542f8c/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaDdDRG9MWm05eWJXRjBTU0lJYW5CbkJqb0dSVlE2RTNKbGMybDZaVjkwYjE5bWFXeHNXd2RwQXNBRGFRSnJBVG9LYzJGMlpYSjdCam9NY1hWaGJHbDBlV2xhIiwiZXhwIjpudWxsLCJwdXIiOiJ2YXJpYXRpb24ifX0=--add6c03f260459c398580ec7dfa5c470f4dfa962/Product_Headers_Stainless_Steel_Wall_Tie_3000x545.jpg)
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](/rails/active_storage/representations/redirect/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBBb2dNIiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--a08ff0341e7e26bd4d9266c44001deae8c5f73fc/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaDdDRG9MWm05eWJXRjBTU0lJYW5CbkJqb0dSVlE2RkhKbGMybDZaVjkwYjE5c2FXMXBkRnNIYVFLUUFUQTZDbk5oZG1WeWV3WTZESEYxWVd4cGRIbHBXZz09IiwiZXhwIjpudWxsLCJwdXIiOiJ2YXJpYXRpb24ifX0=--96d7c84ffe1141a71c481f53d82ad32a66f6f483/HRT4_200_with_CE_PartE.jpg, /rails/active_storage/representations/redirect/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBBb2dNIiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--a08ff0341e7e26bd4d9266c44001deae8c5f73fc/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaDdDRG9MWm05eWJXRjBTU0lJYW5CbkJqb0dSVlE2RkhKbGMybDZaVjkwYjE5c2FXMXBkRnNIYVFKWUFqQTZDbk5oZG1WeWV3WTZESEYxWVd4cGRIbHBXZz09IiwiZXhwIjpudWxsLCJwdXIiOiJ2YXJpYXRpb24ifX0=--e6669074792a01881b37ac55cdb4ae186ff1fa16/HRT4_200_with_CE_PartE.jpg 2x)
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 springs into action with new T-Head Bolt for easier MDC fixing
Leviat has made installing its market-leading Ancon MDC masonry support system easier and faster, with a new sprung T-Head Bolt design that simplifies fixing and prevents the bolts from disengaging from the cast-in channel during installation.
Leviat Announce the Latest Addition to the Award-Winning Range of Basalt Fibre Low Thermal Conductivity Wall Ties
The new Ancon Teplo-BFL Frame Cramp is an ideal solution where a low thermal conductivity restraint fixing is required between a masonry outer leaf and an in-situ structure.