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Old 10-09-2019, 01:39 PM   #1
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Acoustic Insulation?


I would like to use some type of acoustic insulation for the walls separating a finished basement and a garage. As well as between the ceiling joists to dampen the sound to the upstairs.



I found this product, that I would use along with fiberglass insulation:
https://www.homedepot.com/p/SilveRbo...AKIT/205975329


Is this decent?..what are my other options?
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Old 10-09-2019, 02:14 PM   #2
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Re: Acoustic Insulation?


Search on here about soundproofing and you will find a bunch of good threads on comprehensive approaches prior to drywall and ceiling finishing.



Resilient channel and rubber isolators are going to be helpful here.
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Old 10-09-2019, 02:27 PM   #3
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Re: Acoustic Insulation?


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Originally Posted by Windows on Wash View Post
Search on here about soundproofing and you will find a bunch of good threads on comprehensive approaches prior to drywall and ceiling finishing.

Resilient channel and rubber isolators are going to be helpful here.

I do not plan on putting any type of ceiling in the garage and the finished basement has a drop ceiling, so both of those do not help except for the wall.
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Old 10-09-2019, 04:06 PM   #4
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Re: Acoustic Insulation?


The more details you can provide, in addition to pictures, the more directed the feedback you will get.


If the drop ceiling grid is already in, some joist insulation is your best bet from a cost effective standpoint. Given the likely cumbersome nature of working around a drop ceiling grid, I would go with fibrous insulation in the joist bays. Roxul usually works well here.

For the walls, you can go double wall, quiet rock, green glue, or resilient channel.
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Old 10-09-2019, 04:37 PM   #5
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Re: Acoustic Insulation?


Quote:
Originally Posted by Windows on Wash View Post
The more details you can provide, in addition to pictures, the more directed the feedback you will get.

If the drop ceiling grid is already in, some joist insulation is your best bet from a cost effective standpoint. Given the likely cumbersome nature of working around a drop ceiling grid, I would go with fibrous insulation in the joist bays. Roxul usually works well here.

For the walls, you can go double wall, quiet rock, green glue, or resilient channel.
Yeah, let me better explain, sorry

Garage ceiling:
I do not want any type of covering(plywood/drywall), just faced insulation. Allows for easy access to electrical, plumbing, ect.

I planned to place that SilveRboard right against the upstairs sub floor, then add soundproofing fiberglass faced insulation.

Garage wall to finished basement:
2x6
3/4 Plywood(garage side)
drywall(finished side) - could use quiet rock here
then finish with soundproofing insulation
could do the channels here

Finished basement drop ceiling:
This is heated and heat rises, so I wanted minimize insulation here. I was just going to put that Silverboard between the joists.

So, my main questions are:
#1) Is that SilveRboard a good product?, is there something better?
#2) What is the recommend soundproofing insulation that does not lose R value?

Last edited by mac1990; 10-09-2019 at 04:40 PM.
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Old 10-10-2019, 07:52 AM   #6
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Re: Acoustic Insulation?


Quote:
Originally Posted by mac1990 View Post
Garage ceiling:
I do not want any type of covering(plywood/drywall), just faced insulation. Allows for easy access to electrical, plumbing, ect.

I planned to place that SilveRboard right against the upstairs sub floor, then add soundproofing fiberglass faced insulation.
It sounds like you have habitable rooms above your garage. The ceiling must have a fire rated cover, a la 5/8" Type X gypsum board. The separating wall can remain 1/2".

FWIW if you're that worried about sound transmission through the separating wall from the basement, going the more complicated route like a double wall, channels, or whatever won't make all much difference unless you use an acoustical door.

Quote:
Originally Posted by mac1990 View Post
#2) What is the recommend soundproofing insulation that does not lose R value?
To insulate a garage from adjacent rooms, mineral wool (Rockwool is a brand) is the easiest way to both insulate and get good soundproofing. R15-30 depending on thickness. If you only want soundproofing, Rockwool "Safe'n'Sound" is denser, but only 3" thick so probably is not as good an insulation value (they do not list R value because it is not for that purpose).

Quote:
Originally Posted by mac1990 View Post
I planned to place that SilveRboard right against the upstairs sub floor
Is that SilveRboard a good product?, is there something better?
I have not used that one, but it is just insulation board with a foil face of which there are many products. A radiant film only works as a thermal barrier if there is an air space next to it.
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Last edited by 3onthetree; 10-10-2019 at 07:58 AM.
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