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ATENDIA has two training rooms separated by a movable glass wall. When training sessions ran in both rooms at the same time, speech from one room could be heard and understood in the other. The client wanted better sound insulation between the rooms without building work.
We carried out a site survey and set out in a report where the sound gets through.
We proposed two options, each with a budget:
The client chose the curtains knowing in advance how much they could achieve.
We made, delivered and installed the curtains on aluminium tracks so that they move easily. Delivery took place during the pandemic, but we kept to the deadline and the budget.
The result. We measured the level difference between the two rooms with pink noise – once with the curtains closed and once with them open. The curtains add 4.5 dB – within the forecast. The difference is clearly audible, but it is not “twice as quiet” – that would take about 10 dB. The client now runs training sessions in both rooms at the same time.
When curtains are enough and when they are not. A heavy curtain reduces sound by a few decibels and does little at low frequencies. When 10 dB or more is needed, the solution is a partition – a wall, door or movable wall with a higher sound insulation rating (R′w).
More about curtains – what they can do and how they are installed: Acoustic and Soundproofing Curtains.
Similar problem? See Acoustics and Soundproofing for Offices and how we measure sound insulation or contact us via the enquiry form.
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