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Looking for sound isolation advice

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DavidR8

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Joined
Aug 27, 2019
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269
Location
Victoria, BC
I'm in the planning stages of a ~20' x 30' garage with a second floor suite, basically a carriage house. I do wood work and metal work. Looking for advice on how to best isolate the garage sound from the up stairs living areas. Already planning to put the air compressor outside in an add-on.
Thinking about putting Rockwool in the ceiling joists and hanging the drywall from resilient bars.
Happy to take any other suggestions.
Thanks!
 
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OP
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DavidR8

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Aug 27, 2019
Messages
269
Location
Victoria, BC
Denwood said:
Two layers of 5/8 typeX with green glue in between, on resilient is a great start. Will there be any HVAC penetrations to the 2nd floor? Stairway?
Click to expand...
No penetrations at this point but still early in the design stage.
Appreciate the advice on two layers. I completely forgot about that option.
 
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egdede

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Dec 20, 2009
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If you can lose the square footage, double framed walls or staggered stud decouples the drywall on each side of the wall. I have framed staggered stud walls with 2X3s over 2x6 plates (on 12" centers) for non bearing curtain walls. You save a little floorpsace w/2x3s. 2x3s make for flexy walls on 16" centers. Staggreed stud did better than double drywall staright on studs. I would either hang single drywall on resiliiant channel or greenglue double drywall before I would just use double drywall straight screwed to studs.

But for an apt in a shop? Staggered stud wall with either green-glued double drywall 1 drywall w/resiliant channel on the interior side would be incredibly effective. Then you could put OSB on the shop side. In general it is also better to have a different surface on each side of any 'soundproof' wall.
 
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Denwood

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Thunder Bay, Ontario, Canada
egdede said:
If you can lose the square footage, double framed walls or staggered stud decouples the drywall on each side of the wall. I have framed staggered stud walls with 2X3s over 2x6 plates (on 12" centers) for non bearing curtain walls. You save a little floorpsace w/2x3s. 2x3s make for flexy walls on 16" centers. Staggreed stud did better than double drywall staright on studs. I would either hang single drywall on resiliiant channel or greenglue double drywall before I would just use double drywall straight screwed to studs.

But for an apt in a shop? Staggered stud wall with either green-glued double drywall 1 drywall w/resiliant channel on the interior side would be incredibly effective. Then you could put OSB on the shop side. In general it is also better to have a different surface on each side of any 'soundproof' wall.
Click to expand...
OP's apartment is upstairs :)

@DavidR8 , you can also fill the ceiling cavity with blown in cellulose. If you do that, with the 2 layers of type x, green glue and resilient, it will be pretty quiet upstairs. That's more or less what we used to isolate the 900 square foot film studio in my commercial building on the 2nd floor. The system worked extremely well.
 
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canopus

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May 12, 2012
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Separate the ceiling joists from the floor joists (yes I know, extra framing). Mineral wool (Rockwool or Safe & Sound, etc) insulate both ceiling and floor and the garage walls. Use acoustic caulk between the studs and the sheetrock in the garage. If you are really concerned about sound you could double sheetrock it with some mass loaded vinyl between sheetrock layers or at minimum use some mass loaded vinyl under the floor upstairs. the main idea is to separate the two noise planes so sound doesn't travel from one to another. Another point is to be sure to back your penetrations so sound doesn't travel into through those electrical boxes etc to go from one space to another. So backing boxes with some kind of packing or sound putty wrap, wrapping pipes or other penetrations from space to space etc.
 
OP
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DavidR8

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Aug 27, 2019
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269
Location
Victoria, BC
canopus said:
Separate the ceiling joists from the floor joists (yes I know, extra framing). Mineral wool (Rockwool or Safe & Sound, etc) insulate both ceiling and floor and the garage walls. Use acoustic caulk between the studs and the sheetrock in the garage. If you are really concerned about sound you could double sheetrock it with some mass loaded vinyl between sheetrock layers or at minimum use some mass loaded vinyl under the floor upstairs. the main idea is to separate the two noise planes so sound doesn't travel from one to another. Another point is to be sure to back your penetrations so sound doesn't travel into through those electrical boxes etc to go from one space to another. So backing boxes with some kind of packing or sound putty wrap, wrapping pipes or other penetrations from space to space etc.
Click to expand...
Thanks, this is an interesting idea. I've seen it done for walls but not for ceilings/floors. I'll mention it to my contractor.
 
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Fav Onefour

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709
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MN cold and hot
Pretty cool to see that there is data available.
I used to do high end audiophile theater and listening rooms before we had data. It was a lot of trial and error.

Good news @DavidR8 , is that you are not working with low frequency transmittable sound. Those are tough to isolate.
The double layer sheet rock methods definitely help. Isolation between barriers also adds better protection. With the ceiling insulation, I personally like using kraft faced insulation with the asphalt backing for the first layer. After that layer, top it off with blown cellulose.

Plan for zero penetrations and make it happen.
Also keep in mind that floor and ceiling finish materials matter. Your process isn't done best if you ignore those steps.
 
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