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floor vibrates like a speaker

Hello,
I am close to finishing my listening room. The walls and ceilings are two layers of sheetrock hung on resilient channel. The problem is the floor. My room is over the garage. The sub floor is 1" t/g particle board. It resonates like a speaker into the garage below, and although it loses some db, it makes its way through the garage walls to the neighbors. I intend to insulate between the floor joists but I doubt if that alone will add much to the STC value. I have seen lots of recommendations for sound blocking, including using expensive vinyl pads. However, the least expensive and one of the more common mehtods recommended is adding a layer of sheetrock (or 2) over the subfloor and then a layer of plywood and then put your carpet pad and carpet. I wonder how soundboard in place of the sheetrock would change the dynamics? Your input is as always, welcome.
joeb
joeb

Showing 1 response by eldartford

eldartford
4,262 posts
 
In my living room I have a floor that is very dead. My intent was to block the sound of an ancient oil burner furnace located directly below. (It sounded like a Saturn 5 rocket when it started up!)

The floor consists of 1" boards with oak flooring over. (This was the original floor 150 years old).Then there is felt (not rubber) carpet underlayment, covered with 1/2 inch ply, nailed down through the felt. Then, in the center of the room, comes the regular carpet underlayment and the carpet, and around the carpet it new oak flooring.

The floor is, as I said, very dead, and I credit the felt carpet liner/plywood layer.
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