Author Topic: Soundproofing a half-wall in an unfinished basement...  (Read 3756 times)

diwrecked

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Soundproofing a half-wall in an unfinished basement...
« on: November 08, 2012, 08:19:37 PM »
Greetings!

First time post / question here regarding my first soundproofing project....

I recently moved into a new construction home and am looking to soundproof the basement as much as possible.  The basement consists of 6" poured concrete walls on 3 sides and has a 40ft half-wall (Framed and insulated) with fiberglass French Doors on the only side facing my neighbors (about 50 feet away). 

I run a sound company, so I am constantly testing out gear in the basement and have a PA system set up for friends to play music on when we have people over.  I am hoping to make the basement as soundproof as possible as we would like to be able to play music at a good volume at obscene hours of the night.  I have been looking at a lot of different options for soundproofing the half-wall and need some advice. 

I have already used GreenGlue sealant around all doors and windows and have added a layer of Roofing felt behind OSB to the framing as a base to build off of.  I have been contemplating adding a few layers to the wall to increase the mass, but am steering away from going the resilient channel route quite yet. 

Here's the "sandwich" I had in mind:  Framing w/ Insulation | Roofing Felt | OSB | Roofing Felt | Homasote | Drywall | Green Glue | Drywall 

I have all of these materials on hand and am using the Homasote and Roofing felt to dampen/absorb vibrations between the drywall/greenglue combo and the wood.  I have contemplated adding furring strips to create airspace between the homasote and the drywall OR adding MLV to the mix.  I would like to avoid the MLV if possible due to cost. 

Please let me know what you folks think is my best plan of attack.  I would like to block as much sound (including low frequencies) as possible from passing through the half-wall.  I am planning on treating the ceilings as well in a few months when we finish the rest of the basement, but right now the half-wall and french doors are the weakest points in the structure. 

Thank you all in advance!

D


Randy S

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Re: Soundproofing a half-wall in an unfinished basement...
« Reply #1 on: November 08, 2012, 08:37:12 PM »
Well the french doors are a project buster...if you want to play at all hours loudly you are going to have to replace the doors with solid core doors and add mass or build a double door entry...this will decide the entire value of your project. also I would have no idea what the mass value would be using the products you mention...might be great for mids and highs but no way for the low frequency..
If you dont decouple then mass law will be the end value...

Why do you give us a call direct and lets discuss the principles and why you need to apply them.

Randy S.

760-752-3030 ext 104
Randy Sieg

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

diwrecked

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Re: Soundproofing a half-wall in an unfinished basement...
« Reply #2 on: November 08, 2012, 09:21:16 PM »
Yes,  I understand the doors are going to be the hardest part of this project.   :(  The problem is, they are brand new Jeldwen fiberglass insulated doors, so I am reluctant to replace them right off the bat.  I have read that Fiberglass doors, while not as good as solid core doors, can still be effectively treated for sound. 

My plan was to start with replacing the weather stripping and adding door sweeps, a SSP T-Strip, a "soundproof" saddle / threshold and gaskets similar to this: http://www.tmhardware.com/images/D/272A_3_(LR).jpg    I was toying with the concept of adding a sheet of 2LB MLV to the door as well. 

Any thoughts on that? 

As far as the walls go, I am basically looking to add as much mass and dampening with a "sandwich" as possible for now.  Do you see any major benefit to leaving an airspace between the homasote and the drywal/greenglue combo?

D

Randy S

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Re: Soundproofing a half-wall in an unfinished basement...
« Reply #3 on: November 08, 2012, 09:54:20 PM »
ok for the doors for now.. ok for the MLV on the door if need be.
Forget the gap between the homasote and drywall, you dont want to create a resonance chamber.
Randy Sieg

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

 

anything