Introduction
Copse Mill Properties Ltd. commissioned us to provide acoustic design solutions for three dance studios located below an office space at 12 Richmond Parade, Brighton. The aim was to minimize noise breakout from the studios and control the reverberation time within them, ensuring a conducive environment for both the dance activities and the office operations above.
Site Description
The site is utilized by The Brighton Academy for musical theatre and dance rehearsals, which involve amplified music and various dance styles, including tap. The dance studios are situated on the ground floor, directly beneath office spaces.
Acoustic Challenges
- Noise Breakout: The primary concern was the transmission of noise from the dance studios to the offices above, which could disrupt office activities.
- Reverberation Time: High reverberation times within the studios could lead to increased internal noise levels, affecting the quality of the dance rehearsals and contributing to noise breakout.
Survey and Measurement
We conducted a series of diagnostic tests, including:
- Reverberation Time Measurements: Using the interrupted noise method to assess the reverberation times in the studios.
- Sound Insulation Testing: Evaluating the sound insulation performance of the separating floor between the studios and the offices.
Findings
- Reverberation Time: The measured reverberation times were higher than ideal for dance studios, indicating a need for additional sound absorption.
- Sound Insulation: The existing floor construction provided insufficient sound insulation, allowing noise from the studios to be clearly audible in the offices.
Recommendations
Reverberation Control:
- Acoustic Plaster Finish: Applying an acoustic sprayed plaster finish to 50% of the ceiling in each studio to reduce reverberation times
- Alternative Panel Solution: Installing Class C broadband absorbers on 60% of the ceiling area if a panelled solution is preferred.
Sound Insulation Enhancement:
- Mass Barrier Ceiling: Removing the existing plasterboard ceiling and lathe and plaster, and installing a new mass barrier ceiling with acoustic hangers, mineral wool infill, and a minimum 200mm void. This would significantly reduce noise transmission to the offices above.
Conclusion
The proposed acoustic treatments, including the reduction of reverberation times and the enhancement of sound insulation, did create a more suitable environment for both the dance studios and the office spaces. The measures helped in minimizing noise disturbance and improving the overall acoustic quality of the premises.
This case study highlights the importance of tailored acoustic solutions in mixed-use buildings to ensure the functionality and comfort of all occupants.
