Where to Put the Vapor Retarder in a Concrete Slab
I have an existing basement floor with a 2 car garage under the house. The floor appears solid except for 5 feet in from the garage doors where cracks have developed due to water. In this location, It also sounds hollow when tapped with a metal pry bar in this area. The rest of the basement floor sound solid with no cracks. I’ve received a quote to pour a new 4” concrete slab above the existing floor about 20 feet in from the garage doors with a vapor barrier between the slabs and a perimeter drain. My first question is should a vapor barrier be placed between the old slab and new slab? Should we dig up the damaged area first (5’ in from doors) before pouring a new slab? I do plan to prevent any water from outside coming into basement by installing gutters and using exterior foundation perimeter channel drains. I don’t plan on refinishing the basement to a living space. Thanks!
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