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Soundproofing Forum Topics => Other Soundproofing Questions => Topic started by: warpedcore on October 06, 2015, 11:20:05 PM

Title: Commercial Triple Leaf Effect - Floatation Therapy Center
Post by: warpedcore on October 06, 2015, 11:20:05 PM
Hey everyone,

Currently opening a large floatation therapy ( center where we planned on going all out for soundproofing in order to facilitate the most quiet space possible. Float tanks are essentially large basins filled with skin temperature neutral Epsom salt water (~1000lbs) that you float in; absence of sound, light and touch to help people relax, meditate, recover etc.

Obviously this requires a strong level of either soundproofing or ability to keep the facility extremely quiet.

My concern is that we've spent a fair bit of money, time and effort to put together ~60+ STC rated rooms and just as we've been putting up framing and drywall - I've come to the realization that our double stud setup might be compromised by the firewall/shared unit wall in between us and our neighbor - causing some form of triple leaf effect.

Rundown of our current setup and area of concern in bold:

- double studded (4inch) walls with double layer 5/8" drywall and green glue with R13.
- Air cavity of 10" between each room.
- Air cavity of 6" from shared firewall/unit separator
- 1-3/4" solid core doors with 1/2" MDF with GG on either side + Zero Int'l seals etc. (facing away from shared wall)
- Tanks are all on heavy-duty vibration pads and are not touching any walls.

Assuming our commercial neighbors get noisy (slamming large doors & music) while we have customers, how much of a problem might that one shared wall (4" stud, 1/2" drywall, with minimal insulation) be if our studs are 6" away. We currently have 18" of space from drywall to drywall between each room but only 10" from our drywall to first layer of shared wall drywall. It's also important to note that there is a big metal door attached on the other side of the wall that they seem to use quite often (we may offer to buy them a heavy-duty closer to reduce slamming/vibrations).

Am I just being over-cautious? It just hit me today during construction that it's technical a triple leaf setup and wanted to verify with someone who might be able to guide me in the right direction.

Title: Re: Commercial Triple Leaf Effect - Floatation Therapy Center
Post by: Randy S on October 07, 2015, 03:48:59 PM
You do have enough separation to be a huge benefit and you are definitely in the 60+ STC range.
If the neighbors generate frequencies below 100hz or volumes greater then 90 db you might have some sound that could get in the rooms but not sure it will make it to the float tanks.

Normally I do not like guessing at these values and normally do field testing during the course of installation that way I can increase the mass value if need be.

Are the air cavities left hollow or do you plan on filling them with insulation?

Good idea for the door closer...

Randy S.

Title: Re: Commercial Triple Leaf Effect - Floatation Therapy Center
Post by: warpedcore on October 07, 2015, 11:04:58 PM
Thanks so much for the response Randy - definitely gives me some piece of mind.

I talked to the owners of the neighboring space today and they shouldn't be testing jackhammers or blasting heavy bass during operating hours, so we should be OK. Just as a precaution though, we ended up re-framing the rooms 12" off the walls instead of 6" since we had to make a decision today or be stuck with it.

Vibrations are definitely going to be the killer for inside the tank, although your head is submerged underneath dense salt water. I'm hoping that even if there was some lower frequency noise that the vibration pads - coupled with the mass and air cavity - will mitigate most issues with feeling something in the tank.

As far as we planned, we are leaving the 12" air cavity hollow - aside from the r14 in the actual 4" stud. Would you recommend anything different?
Title: Re: Commercial Triple Leaf Effect - Floatation Therapy Center
Post by: Randy S on October 07, 2015, 11:11:49 PM
dont be fooled by the water, it is an amplifier for vibrations @ 4,700 fps.
Give me a call and lets discuss a few things before the tanks are in and the walls are painted.

Randy S.
760-752-3030 ext 3095