However, in order for you to achieve the sound deadening results you are looking for, there must never be any direct physical connection between the Homasote or other material and the plywood base. This means glue or caulking but no screws, nails or brads of any kind, ever! If you are using brads or nails to mount the track, make sure they are sized so as not to penetrate beyond the thickness of the Homasote. As soon as one nail penetrates beyond the isolation matting and into the plywood base, you have created a significant transfer path for sound and vibration.
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