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Sound Control

 
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Old 03-21-2012, 02:15 PM   #1
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Sound Control


I recently added some decorative sound barrier ceilings in an office. They have a main room in the middle of the building with support staff off that and offices on the outside walls. Some of the support staff were complaining about the noise in the main room while they were trying to work, so on 2 of the office areas we were able to install drop ceilings. In three others right above the work area were the fire sprinklers so short of redoing them we had to try a different approach. The main hvac trunk line also is right up there so we'd have to make modifications to that with a full ceiling. We added some stained plywood ceilings to bring ceiling area out to the decorative beam running the perimeter of the main room (see pictures). They are still complaining about the noise levels not changing. Does anyone have any suggestions of options to try?

I attached a few pictures of the area from a few different angles.
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Sound Control-img_1877.jpg   Sound Control-img_1880.jpg   Sound Control-img_1879.jpg  
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Old 03-21-2012, 06:38 PM   #2
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Re: Sound Control


Did you install any RC-1 channel?

Did you apply a sound deadening membrane anywhere between the finished ceiling and decking/joists?

Insulation?

Is there a firewall or separation wall between the office and the warehouse that runs to the deck, or is it just a demising partition that stops 6" above the finished ceiling?

Answer those for me please and I/we will have a better understanding of where your sitting.

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Old 03-21-2012, 06:39 PM   #3
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Re: Sound Control


Tell everyone to whisper. That will be $25.
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Old 03-21-2012, 07:21 PM   #4
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Re: Sound Control


Quote:
Originally Posted by Mud Master View Post
Did you install any RC-1 channel?

Did you apply a sound deadening membrane anywhere between the finished ceiling and decking/joists?

Insulation?

Is there a firewall or separation wall between the office and the warehouse that runs to the deck, or is it just a demising partition that stops 6" above the finished ceiling?

Answer those for me please and I/we will have a better understanding of where your sitting.
I have not installed any insulation yet, that is my thought for the next step. There is no firewall really, the top two photos are from the main room looking over the 8ft walls that are the offices. Due to air flow I don't want to full block it off but thought maybe insulation might help absorb some of the sound.
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Old 03-21-2012, 07:32 PM   #5
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Re: Sound Control


I have used these panels with excellent results. They also have customer support that can guide you in determining your needs.

http://www.atsacoustics.com/cat--ATS...nels--100.html
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Old 03-21-2012, 09:52 PM   #6
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Re: Sound Control


Do I understand correctly that the walls don't go all the way to the ceiling and that you installed the cabinets to block that space?
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Old 03-21-2012, 10:18 PM   #7
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Re: Sound Control


Install white or pink noise generators.
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Old 03-21-2012, 10:24 PM   #8
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Re: Sound Control


Pink noise?
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Old 03-21-2012, 10:30 PM   #9
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Re: Sound Control


White noise is equal energy per frequency and pink noise is equal energy per octave.
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Old 03-21-2012, 10:30 PM   #10
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Re: Sound Control


Should I mention brown noise too?
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Old 03-21-2012, 10:32 PM   #11
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Re: Sound Control


+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
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Old 03-21-2012, 10:39 PM   #12
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Re: Sound Control


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Should I mention brown noise too?
I know all about the brown note.

It figures you know about the pink noise too.
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Old 03-21-2012, 11:29 PM   #13
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Re: Sound Control


You may want to take Millhouses advice and contact the manufacturer for advice.

What I will tell you is that your issue is sound continuance.

You have nowhere for the sound to dissipate and die. It is just being carried over the partitions, through the screws and voids and into the office.

Insulation in and of itself isn't the answer. I'm not familiar with the product you installed but I have done enough soundproofed areas to know you need a system of different components working in harmony to eliminate the sound transmission, not just an individual product.

It may have been helpful to do an STC rating prior to and after the install to see just how much improvement the system made.

Could be static deflection, could be passive energy, doubt it's h.o.w. deflection but who knows.

Sound is like water, or a bug...if you head it off at one area it is going to find another place to come in, no matter how small (like gaps between the drywall and outlets). It will go up to the ceiling, hit the decking, run down the joist and bounce right back down, in and around. Complete sound isolation, or even major isolation is a project in itself.

Some products work better than others, such as sound membranes, acoustical wall wraps, etc..but they need to be complimented by materials such as RC-1, acoustical sealant, woven insulation, GREEN GLUE!!!, and a few others.

It's gonna be hard for anyone here to tell you what the solution is because we don't know the site conditions, what is surrounding the office, amount of vibration be it directly or indirectly, existing construction, application of new system...it goes on.

What I would recommend is to contact the manufacturer, send them ALL the information you possibly can, and set up a meeting with one of their tech's or consultants to see what else can be done in addition to the ceiling to help isolate the transfer.

It's going to be tough with such low walls I can tell you that, but let the people who made the product guide you.

Good luck.
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Last edited by Mud Master; 03-21-2012 at 11:40 PM.
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Old 03-22-2012, 10:25 AM   #14
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Re: Sound Control


Thanks everyone for the input. I am going to contact the Acoustic Panel company and see what they have to say.
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Old 03-24-2012, 03:16 PM   #15
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Re: Sound Control


I just went through a huge issue of sound in a boiler room I built. I posted in the Super Soundproofing forums and got a lot of great information.

I used a lot of: MLV -mass loaded vinyl, green glue, cotton insulation, resilient channel and a bunch of other stuff for my situation and it helped tons.

I bought a lot of stuff from http://soundproofing.org/ and got a lot of support from them too.

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