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Acoustic problems in fitness rooms are reputed to be the most complex to solve given the number of parameters that come into play. Nature and thickness of the support floor, location of the club in relation to residential properties, type of building, and so on are all crucial elements to consider.
As the Basic-Fit gym in Aubervilliers is located on the ground floor of a 6-storey residential building, residents at all levels complained just after its opening about the vibration nuisances caused by heavy dumbbells and other weights being dropped on the floor and the noise caused by large exercise equipment such as rowing machines.
After an initial acoustical treatment proved to be unsuccessful, the owner hired a second acoustic consultant who submitted several proposals with different acoustic floor suppliers, including CDM Stravitec. After a thorough study and on site testing, the results obtained on the CDM Stravitec test platform proved to be the most conclusive.
We therefore proposed a different solution with Stravigym XP with Stravigym GympactLayer-45 and dBooster® technology for the ‘free and functional weight’ zone and Stravigym HP for the so called ‘force’ zone in the gym.
Even if it is not the parameter that prevails first, both systems have a resonance frequency of 9Hz.
The Stravigym XP system has the particularity of pushing the limits of dry acoustic screeds by seeking out very low frequency (31H) noise, even if the regulation is limited to 125Hz.
In order to avoid any misuse, we proposed to install the floor, following tests carried out with dumbbells being dropped on the floor from approximately 1 m, generating noise levels up to 55 dB(A) in Leq, or deadlifts from 80 kg producing more than 42 dB(A) in the apartment above the gym.
We have succeeded in reducing the noise by 30 dB(A) overall, to get to:
- an overall emergence of 1 dB(A);
- at 31.5 Hz of 6 dB max;
- at 63 Hz of 8 dB max;
- at 125 Hz of 4 dB max.
As expected, we no longer experience any noise nuisance now that the gym located under our apartment is acoustically improved. Congratulations!