21dB sprays on acoustics

21dB sprays on acoustics

Published: MEA

LEBANON: Beirut-based acoustic consultant, 21dB, has recently tackled two highly reverberant spaces using spray-on acoustic plaster. The consultant used STO’s Akustik Spritzputz as it would be able to handle the curved surfaces at both venues.

The first project took place in the Ada Dodge Gallery at the American University of Beirut. The gallery suffered from long reverberation times which caused very bad music and speech clarity. This inhibited the gallery operator from running any sound art exhibitions in this space.

This was the first time the consultant had used the product and over a 15-day project, 21dB covered a surface area of 325 sq-m with acoustic material. Akustik Spritzputz was reportedly selected as it was the least invasive solution and provided seamless treatment for the gallery.

Akustik Spritzputz is a German-made acoustic spray plaster which 21dB describes as ‘the best solution for curved walls’. It is sprayed on in a series of layers which each need to dry before the next one can be applied until a 15mm thick plaster is in place. This was the main challenge 21dB faced at the Ada Dodge Gallery. High humidity during the application delayed the drying time for the intermediate Akustik Spritzputz layers and lengthen the duration of the project.

Despite this there was a successful result and the reverberation times were reduced from 4s to 1.4s.
The second project took place at Gilt restaurant in Saifi, Beirut. The restaurant was suffering from reverberation that made it difficult for customers to speak and hear the music. A further challenge in this project was that the acoustic solution was not allowed to interfere with the interior design.

The consultant again opted for Akustik Spritzputz to cover the curved walls and ceilings. To complicate matters more, the restaurant was to stay open during the works. The spraying process would start early morning at 5am until 12pm, then the restaurant would open for both lunch and dinner. Over the course of 35 days, 21dB covered 110 sq-m with the acoustic material and there were once again some delays due to high humidity.

The result was again seen as successful. The restaurant’s reverberation time was cut from 1.4s before the application to 0.6s.


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