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"Guilford of Maine" sells acousticaly transparent material which would work well for what you are hoping to achieve. Make the framework out of wood, staple "Wedgy", 30# roofing felt, or a neoprene rubber to any floor mount frame members in order to isolate them from the floor. Use 2 1/2" screws rather than nails to mount to the floor
You can get material samples from GOM at www.GuilfordofMaine.com/samplecenter
"Guilford of Maine" sells acousticaly transparent material which would work well for what you are hoping to achieve. Make the framework out of wood, staple "Wedgy", 30# roofing felt, or a neoprene rubber to any floor mount frame members in order to isolate them from the floor. Use 2 1/2" screws rather than nails to mount to the floor
You can get material samples from GOM at www.GuilfordofMaine.com/samplecenter