Acoustic Screed for Flats and Apartments: A Building Regulations Guide

Acoustic screed is a specialist floating screed system used to reduce the transmission of impact sound between floors in residential buildings. It is required by Part E of the Building Regulations for all new-build flats, apartments, and converted dwellings in England and Wales. Getting the specification right is critical — an under-specified system will fail acoustic testing and require expensive remedial work.

What Is Acoustic Screed?

Acoustic screed is a floating screed system laid over a resilient layer — typically mineral wool or rubber acoustic mat — that isolates the screed from the structural floor below. This isolation layer absorbs impact energy before it can travel through the structure. The screed must be laid at sufficient depth (typically 65–75mm for sand and cement, or 40–50mm for specialist liquid acoustic screed) and must not be allowed to bridge the acoustic layer at edges or penetrations, which would create a direct sound path.

Building Regulations Part E

Part E of the Building Regulations sets minimum performance standards for sound insulation in new residential buildings. For floors between dwellings, the standard requires a minimum airborne sound insulation of 45dB DnT,w + Ctr and a maximum impact sound transmission of 62dB L'nT,w. These standards must be demonstrated through pre-completion sound testing carried out by an accredited acoustic testing company. screeding.com works with acoustic consultants to ensure every acoustic screed installation is specified correctly before work begins.

Common Causes of Acoustic Screed Failure

The most common cause of failure is screed bridging — where the screed makes direct contact with the wall, creating a flanking path for sound. This happens when edge insulation strips are omitted, installed incorrectly, or damaged during screeding. Other causes include insufficient screed depth, the wrong resilient layer specification, and pipework or services that puncture the acoustic layer without proper isolation sleeves. screeding.com installs perimeter edge strip as standard on every acoustic screed project.

Planning an acoustic screed installation? Ring screeding.com for specialist advice and a free no-obligation quote. We carry out acoustic screed installations on residential developments across the UK.