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4 Layers of Insulation and Sound Deadening (Spray Foam, Wool/Denim, ESP Low-E EZ Cool Professional Car Insulation, Polysio Rigid Foam)
Foam board insulation with timber overlay.
The floors have 3/4" hard foam insulation and a 1/2" plywood sub-floor. The sub-floor was screwed into the chassis with 1.5" stainless steel lag screws, which were counter sunk into the wood. Then a layer of wood filler and one foot square vinyl tiles.