Author Topic: soundproof condo between floors  (Read 4743 times)

tyoungnj

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soundproof condo between floors
« on: October 22, 2014, 06:55:46 PM »
I am putting together a plan to partially soundproof my condo and would appreciate any tips/feedback/etc from the experts. Here's my situation - the building is concrete construction (block walls between each unit) with metal truss/poured concrete floors. There is very little transfer between walls, but the sound from above is unbearable. The unit above is tile floor, and I can hear every footstep, every chair being moved, and when they open their sliding door it sounds like a 747 is landing in my unit.

I'm about to do some remodeling so I want to take the opportunity to soundproof as much as possible, without breaking the bank. My plan is to remove the existing sheetrock on the ceiling, attach isolation clips (have been looking at ISOMAX) directly to the trusses, attach furring channel to the clips, then do 2 layers of 5/8 sheetrock with Green Glue in between. I'd also fill the space between the trusses with Safe N' Sound.

I've attached a pic showing what the trusses look like, and a drawing of my plan. The questions I have are:
- is this sufficient to eliminate sound transfer?
- is there a more efficient/cost-effective approach?
- how much transfer will I still get through the tops of wall where I can't add clips?
- how much soundproofing would I lose if I just did the safe n' sound and didn't isolate the ceiling?
- any idea on what a contractor would charge (ballpark) to do this in a ~1100 sf condo in FL? I'm guessing it's not cheap.

Thanks!



Randy S

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Re: soundproof condo between floors
« Reply #1 on: October 23, 2014, 04:59:59 PM »
- is this sufficient to eliminate sound transfer? this system will give you about 40% reduction

- is there a more efficient/cost-effective approach? based on your current assembly maybe a third layer of drywall after you assess the first 2 layer w/green glue

- how much transfer will I still get through the tops of wall where I can't add clips? we can not determine flanking noise until the project has been completed.

- how much soundproofing would I lose if I just did the safe n' sound and didn't isolate the ceiling? with out clip and channel you will not reduce footfall.
- any idea on what a contractor would charge (ballpark) to do this in a ~1100 sf condo in FL? I'm guessing it's not cheap. materials would run about $4.00 sqft unsure what they would charge for labor.

Randy S.

Randy Sieg

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tyoungnj

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Re: soundproof condo between floors
« Reply #2 on: October 23, 2014, 11:52:43 PM »
Randy - thanks for your answers. Are there other ways to reduce the sound transfer? I'm really hoping for more than a 40% reduction. I know I'm dealing with a lot of hard surfaces - tile, concrete, corrugated metal, metal trusses, etc. But I thought I had read that using clips would prevent at least 60-75% of the transfer.
I went back and measured and I'm not sure I have the depth to do 2 layers of sheetrock, so 3 definitely won't happen. From your responses it sounds like you're saying that the doubled-up sheetrock is where most of soundproofing is occurring, right? With the limited depth I have should I be looking at QuietRock or other acoustical board instead?
Last question - do I even need the safe n' sound? Seems like you're saying that won't do anything to prevent the sound transfer.

Appreciate all your help!

Todd


Randy S

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Re: soundproof condo between floors
« Reply #3 on: October 24, 2014, 03:21:55 PM »
The clips will reduce the impact quite well, I just do not want to over promise and under deliver.
The problem is the walls are still tied in and the impact will go down the walls and remit as airborne sound therefore you will lose some of the systems performance we just do not know what the value is until the project is done. no one can predict this.
As for the insulation, IT IS A MUST! if you leave it hollow you will have very little reduction.
And for the double drywall with green glue, it is better than quiet rock and yes this layer is keeping the impact sound with in the cavity, that is the idea.
make sure you leave the 1/4" gap around the perimeter and fill with acoustic caulk finish wet  , do not mud and tape perimeter.

sound board is a waste of money.
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

tyoungnj

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Re: soundproof condo between floors
« Reply #4 on: October 27, 2014, 08:54:05 PM »
Thanks Randy! Have a few more questions, if you don't mind:

- When I have the ceiling open I may be able to wedge some material in between the trusses and furring channel that the walls are attached to (the furring channel is held to the trussed with wire, as you can see in the picture. so there may be some play). Will this help? If so, what's the best material to use?

- Why do I need acoustic caulk at the edges of the ceiling? If I do this correctly shouldn't the ceiling already be isolated by the clips and furring channel? Do I use this just around the perimeter of the room or between each piece of sheetrock?

- I had an insulation contractor tell me that the best solution would be to spray foam the underside of the corrugated steel and the trusses, and not to use safe n sound at all. What do you think? I thought spray foam was a very poor sound insulator.

ymi

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Re: soundproof condo between floors
« Reply #5 on: June 07, 2015, 02:24:44 AM »
Hello,

I was wondering how your sound insulation went and how your results were?

Thank you,
Mimi

 

anything