Author Topic: concrete walls but still have lots of noise  (Read 1557 times)

98yankees

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concrete walls but still have lots of noise
« on: October 05, 2013, 08:18:34 PM »
I live in a townhouse that has poured concrete walls from floor to the attic.  from the floor of the attic to the top of the roof is 4 sheets of drywall (2 on each side) with fg insulation between.   that said I can hear my neighbors walk, close doors, tv, talking etc.  I cant make out what they say but I can hear noise.  I talked to the builder and he said there is NO voids between units.   before I start considering fixing I would like to get some ideas on why/how noise is getting through.   I have read that concrete is a great noise blocker but.....

thanks for anything you can share which might help me tackle my problem.

Randy S

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Re: concrete walls but still have lots of noise
« Reply #1 on: October 07, 2013, 04:27:22 PM »
actually concrete has a high speed of sound (10,600 fps) vs airborne sound (1129 fps).
any thing that either impacts or is directly in contact with the structure allows that vibration to get through and remit as airborne sound..which is what you are experiencing.
the solution is to decouple from the structure, best at the source but if you can not then you will do a decoupled wall system.
things like the slamming of doors is going to go every where in the structure until it runs out of energy.
Poured concrete wall, how thick? I'm surprised you can hear people talking buy if the neighbors TV bolted to the wall, I can see that being heard.
What about the floors and ceiling? are they concrete also? or stick built?
 
Randy Sieg

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