If you live somewhere with natural vegetation, there is moisture in the soil. Concrete is porous to moisture. here is how to fix it: glue down 1-2" of XPS or EPS onto the concrete floor, cover with 6 mil poly or heavier with all joints taped, lay strapping down then plywood for the floor. Install 2" fire rated Thermax on the walls; spray foam the joints and edges. There are easier methods; this one works. |