Plywood is only a modestly effective sound blocker.
Tar paper under carpet.
Can we lay roofing paper over the plywood and under the carpet to keep water from coming through and leaking down on our car.
Flooring felt or tar paper is sometimes laid under tile flat carpeting or old linoleum.
Older flooring felt may contain asbestos making its removal critical.
I have a second story deck 3 4 around my house.
Vinyl plank flooring underlayment sound proofing material under 1 00 underlayment vinyl underlayment cement foam roll foam rubber padding.
Paper 2 plastic 16 polyester 2 polyethylene 45 polyisocyanurate pir 1 polymer 1 polypropylene 19 polystyrene foam 7 polystyrene 8 recycled materials 10.
Infused with rosin or asphalt building paper offers a measure of protection against moisture.
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It has deck boards and plywood and previously had carpet on it.
The paper comes in rolls typically 3 feet wide although other sizes are available.
You want it to breathe and not trap moister that may get through the slab and its tar paper vapor barrier.
The deck serves as a carport over my car as well as we use it to entertain on.
As the broad rule you should put the carpet pad directly onto the wood floor and the carpeting over the pad no vapor barrier needed or desired above the wood floor.