Author Topic: Soundproof small basement shop  (Read 6224 times)

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Offline Jdw8320

  • Posts: 2
Soundproof small basement shop
« on: January 03, 2018, 06:21 PM »
What would be the best way to soundproof a roughly 13’ by 13’ room in the basement? It’s directly under the master bedroom and baby’s room. It has a drywall ceiling with no insulation, 2 walls are cinder block foundation just painted and the other 2 are dry walled. Didnt know if anything needed to be done on the block walls or not.  Don’t know if this makes sense or not but I was thinking of building a stud wall all around the exterior  lowering the ceiling some and putting roxul up. Basically building a slighter smaller and lower room inside of a room. I don’t really want to tear the old ceiling drywall down as there is a lot of plumbing and hvac running through the joists

Offline StanB

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Re: Soundproof small basement shop
« Reply #1 on: January 03, 2018, 08:44 PM »
Use double drywall with silicone or sound dampening adhesive. Screws can be used just be sure to have the silicone behind it to limit sound transmission.

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Offline Sparktrician

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Re: Soundproof small basement shop
« Reply #2 on: January 04, 2018, 08:21 AM »
Roxul Safe 45 is also a great sound dampener. 
- Willy -

  "Show us a man who never makes a mistake and we will show a man who never makes anything. 
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Offline ChuckS

  • Posts: 4697
Re: Soundproof small basement shop
« Reply #3 on: January 04, 2018, 09:16 AM »
I have an acoustic project waiting to be done and came across this Green Glue during my research:


My local Home Depot stores carry this product.

Offline 3PedalMINI

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Re: Soundproof small basement shop
« Reply #4 on: January 04, 2018, 02:42 PM »
I do theaters and soundproofing for a living.

I dont have time right now to go into grave detail but look up theater sound dampening. the High Frequencies of the equipment are easy to contain (just like in a theater) the problem is the lower frequencies are what transfers through walls. (motor drone, cutting, things falling etc)

for proper soundproofing you need to decouple the ceiling. the second you screw through your sheetrock (even with acoustic glue) into the joists it will transfer to the floor above. I know its hard to believe but its true, even just one screw Doing so will negate all of your efforts for sound dampening. you will want to install the roxul, use decoupling systems for the drywall. The problem is its expensive todo.

If you are lucky enough to have the headroom and wall space building a "room within a room" is ideal. you can also use things like z channel or "hat" channel to help further decouple the drywall. also dont forget about the HVAC system, that needs to be isolated as well. best way is to use "dead vents" a substantial amount of sound can be transferred through your HVAC system.

If budget is a concern......use hat channel, two layers of drywall 1 layer 1/2" another layer 5/8" green glue (acoustic glue, its all the same) and take stupid precautions not to drive a screw through the sheetrock into the joists. make sure there is nothing in the ceiling as far as lights/outlets/vents. then use roxul everywhere. hang your lighting and build a wall from the foundation. cement block is a nasty sound reflector. Also hang some acoustic panels up on the ceiling and walls. you can make your own with owens corning 703 and acoustic transparent fabric. Also plan on using a rubber floor, same as the walls you dont want sound reflecting everywhere.

Look up theater designs, it will help you out alot. in your diagram with the two layers of sheetrock its absolutely pointless todo so since the screw is going right up through the layers into the joists. no different then just having a regular layer. Also, make sure the room is not a square, you want a rectangle! this prevents the sound from bouncing around (ever wonder why all theaters are rectangle?) also things like an angle wall in a corner, or a bulkhead around the perimeter of the room all helps with acoustics.
« Last Edit: January 04, 2018, 02:46 PM by 3PedalMINI »
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Offline dupe

  • Posts: 157
Re: Soundproof small basement shop
« Reply #5 on: January 04, 2018, 05:30 PM »
I'm in the process of deadening my truck, but also toyed with treating my shop and living room. Cost was and issue and so many variables, didn't know where to start - Great write up @3PedalMINI . Lots of good points covered here.
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Offline ChuckS

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Re: Soundproof small basement shop
« Reply #6 on: January 04, 2018, 05:36 PM »
Insightful stuff from 3padalmini. Thanks.

Offline Cheese

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Re: Soundproof small basement shop
« Reply #7 on: January 04, 2018, 06:57 PM »
Pursuant to the room configuration that 3PedalMINI was talking about, there are actually ratios of length x width x height for the best sound reproduction and the elimination of standing waves.

Offline mobetta

  • Posts: 14
Re: Soundproof small basement shop
« Reply #8 on: April 08, 2018, 11:17 AM »
you could blow in mineral wool before you cover the existing drywall with a layer of 5/8 + green glue.
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