Walls: Sound Isolation in Room with Foam Concrete Slab Insulation

Discussion in 'Acoustics (Live Room, ISO Booths)' started by parabel, Sep 9, 2019.

  1. parabel

    parabel Active Member

    Sep 9, 2019
    Connecticut, US
    I'm planning to sound-isolate an already-converted garage built on concrete slab. I want to modify the walls to have mass-air-mass with two layers of drywall inside and out.

    The room has rigid foam insulation around the slab that protrudes into the room. The insulation, framing, and the drywall installed over it take up an additional 6"+ around the room perimeter. It seems the only way not to disturb the insulation is to add parallel framing on the inside, which I'd really like to avoid.

    Is there a feasible way to isolate the room which doesn't compromise the slab and doesn't require adding new framing?

    Here are two pictures, a diagram and a photo of the insulation taken through a hole in the drywall which has been there since I bought the house.

    Attached Files:

    • p2.png
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    • fd2.png
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  2. kmetal

    kmetal Kyle P. Gushue Distinguished Member

    Jul 21, 2009
    Boston, Massachusetts
    Home Page:
    The only way to increase isolation without adding framing is to use isolation clips or resilleint channel attached to the existing walls. Otherwise you have to remove the existing rigid insulation, and build your new walls/ceiling with a 1" air gap seperaing the new walls from the existing walls.

    Your isolation requirememts and budget determine what the best method will be.

    If you supply more detail about the project i can provide a more specific and detailed response. Budget, what your trying to isolate, the purpose of the studio (tracking / mixing / both?), and the desired outcome professional use, or hobby or band rehersal ect. Info on how quiet it needs to be outside will be necesssary too, are your neighbors are close by and sensitive to noise or a quarter mile away?

    Its tough to get a perspective based on the drawing and close up. A shot from futher back would help.

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