Hush Acoustics provides standards-beating soundproofing for historic mill conversion

  • 3 Feb 2023

Hush Acoustics has helped the developer of an apartment conversion scheme in a Pennine village to achieve superior sound reduction standards in walls and floors that go way beyond the minimum requirements of the Building Regulations.

The Old Mill House project in Diggle near Oldham involved the conversion of a Victorian industrial building into separate residential dwellings. The project’s design had to comply with the requirements of Approved Document E, which sets out minimum standards in England and Wales for airborne and impact sound transmission between dwellings where there is a Material Change of Use. 

Keen to deliver the highest quality living accommodation to potential buyers, however, the developer insisted that the acoustic specification not only met the minimum standards but went beyond them. In order to achieve their goals for the floors and walls, they approached Hush Acoustics for assistance in developing the specifications and to provide the required products.


Given the unique nature of the properties being created, the acoustic design for the flooring had to be compatible with underfloor heating and more unusual floor finishes such as stone tiling. This is where the Hush Acoustics team was able to utilise its wealth of experience in different types of floor construction and deploy the most suitable products from its versatile range.

The specification

The specification developed by Hush Acoustics for the separating floors beneath the floorcoverings featured a plywood timber deck, below which was the underfloor heating system and 8mm Hush FFR resilient underlay.

On the ceiling side, Hush recommended a standard acoustic insulation within the timber joists, two layers of 15mm Fireline plasterboard attached to the underside of the joists, the Hush MF Ceiling System to allow Hush Slab 100 to be fitted in the void created, finished with a layer of 15mm Soundbloc plasterboard.

For the separating walls, two specifications were developed according to the types of wall. In areas where there was an existing masonry wall, a wall lining consisting of independent stud work, Hush Slab insulation and Soundbloc plasterboard was developed. In other areas of the scheme, a twin timber stud wall as recommended, again featuring Hush Slab insulation and Soundbloc plasterboard.

Visits and guidance

As part of the process, the Hush Acoustics team undertook a number of site visits and provided guidance throughout the design and build process to ensure correct installation was followed, and pre-completion testing was also arranged.

The acoustic solutions developed and provided by Hush Acoustics fully met the developer’s goals to go beyond Approved Document E’s compliance standards. 


Pre-completion testing revealed that airborne performances were achieved of 68 dB DnTw+Ctr, 51 dB DnTw+Ctr, 52 dB DnTw+Ctr across the three airborne tests carried out. Approved Document E stipulates a minimum performance level of 43 dB DnTw+Ctr, which means the higher figures delivered by the Hush specifications here represent a significant improvement.

For impact sound, the Hush solution achieved levels of 58 dB LnTw and 53 dB LnTw. Approved Document E sets out a maximum performance level of 64 dB LnTw and anything lower than that figure is improved performance.


A spokesperson for the developer comments: “I wanted to create dwellings of the highest quality, and acoustic comfort is absolutely central to that. Partnering with Hush Acoustics on this project was extremely beneficial and I’m delighted with the finished results.

“The way the team supported me, my architect and contractors from the outset meant everyone involved could be confident that the acoustic products were being deployed in the correct way and that was confirmed in testing.”

Find out more about the acoustic products and fully tested systems available from Hush Acoustics at

Hush Acoustics Ltd
Unit 2, Tinsley Industrial Estate
Shepcote Way
South Yorkshire
S9 1TH

Tel: 0114 551 8685
Fax: 0151 944 1146

Visit Hush Acoustics' website

Leave a Reply

Latest news

Mitsubshi Electric

Family Day Workshop by Mitsubishi Electric

If you are an architecture or environmental enthusiast, bring your children along to a family day of fun and educational activities at the Building Centre on Saturday 22nd June – Mitsubishi Electric will deliver its award-winning programme, The Learning Curve (with a few twists), designed to teach children about energy use and energy efficiency.

Posted in Articles, Building Industry Events, Building Industry News, Building Products & Structures, Building Services, Facility Management & Building Services, Heating Systems, Controls and Management, Heating, Ventilation and Air Conditioning - HVAC, Pipes & Fittings, Plumbing, Retrofit & Renovation, Sustainability & Energy Efficiency


Keller Kitchens excels in Kiwa assessment

Keller Kitchens has been reassessed by Kiwa, a European institute that is involved in the certification of processes, products, employees and organisations. Once again, the company passed with flying colours!

Posted in Articles, Building Associations & Institutes, Building Industry News, Building Products & Structures, Building Regulations & Accreditations, Building Services, Interior Design & Construction, Interiors, Kitchens, Research & Materials Testing, Restoration & Refurbishment, Retrofit & Renovation, Sustainability & Energy Efficiency

National Ventilation

National Ventilation’s Operations Director Completes D-Day 44 Challenge

Alan Parkinson, Operations Director at National Ventilation, has completed the D-Day 44 Challenge in aid of Combat Stress, the UK’s leading charity for veterans’ mental health.

Posted in Air Conditioning, Articles, Building Industry Events, Building Industry News, Building Products & Structures, Building Services, Charity work, Heating, Ventilation and Air Conditioning - HVAC