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Old 10-22-2007, 10:15 PM   #1
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Atlantic et al: Soundproofing Ceiling between 1st and 2nd floors


Hey guys-

I'm in the middle of a pretty extensive rehab of my house. Converting a 1911 two-flat into a single family. Lots of creative electrical, plumbing and uninsulated plaster walls. Plaster is heavy. I mean REALLY heavy (just ask my disgruntled Waste Management guy!). So far, in the demolished walls, I've found some newspapers from 1929, a Chicago Motorclub letter boasting 3500 members strong and a few cardboard caps from old milk jugs. Interesting, but...

I've stripped my living room to the studs and joists. I have all my new electrical in, the new d/v fireplace installed, furred out the existing wall studs to create 2x6 cavities (for greater insulation depth) and added firestops (balloon framed). I'm under the impression that I should stuff the ceiling joist spaces with insulation to tame sound transmission from the second floor (I have 4 year old twin boys). However, I know that insulation (fiberglass, anyway) is not the best material for maximum sound absorption.

Are there better alternatives for maximizing sound attenuation?

Thanx!
Dusty Home Remodeler

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Old 10-22-2007, 10:24 PM   #2
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Atlantic et al: Soundproofing Ceiling between 1st and 2nd floors


I have heard that 2 layers of drywall seperated by furring strips is a good sound insulator. Apply first layer as you normally would. Then, screw furring strips (1x2 or 2x2?) through the first layer and into the ceiling joists. Then add 2nd layer of drywall. I have never done this and I'm sure it could create other issues such as mounting light fixtures etc. In fact, this method was described for walls, not ceilings, I'm just applying it to your situation. I'm sure it would cut out a lot of sound, but I doubt it is really feasable.

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Old 10-24-2007, 11:32 PM   #3
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Atlantic et al: Soundproofing Ceiling between 1st and 2nd floors


The following Canadian government webpage evaluates the performance of 12 different soundproofing solutions: http://www.cmhc-schl.gc.ca/publications/en/rh-pr/tech/90246.htm
For my house I plan to use a combination of 5/8" drywall hung on resilient channel and mineral wool fire/sound insulation.
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Old 10-25-2007, 06:35 AM   #4
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Atlantic et al: Soundproofing Ceiling between 1st and 2nd floors


Sound "deadening" is about changing sound waves. This is primarily done through creating layers or chambers that act like "baffles" when hit by a sound wave.

Explanation: http://en.wikipedia.org/wiki/Soundproofing

More information:

http://www.extremesoundproofing.com/...cs/basics.html

http://www.soundproofing101.com/

http://www.soundproofing101.com/soundproofing_2.htm

http://www.soundproofing.org/

Some alternative materials:

http://www.soundprooffoam.com/

http://www.acousticsfirst.com/vinyl.htm
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