To Check a Concrete Wall for Dampness, you have to Place an 18-by-18-inch square of clear polyethylene plastic on the concrete wall. You need to seal all four edges with wide concrete-fiberglass mesh tape. If concrete-fiberglass mesh tape is not available, you must use clear packing tape. After that, avoid exposing the plastic sheet to excessive heat or direct sunlight. Then, let the plastic to remain in place for sixteen to twenty four hours.
You must take steps to eliminate the moisture. Next, Combat dampness by covering the concrete walls with a wall-grade epoxy resin. You should Mix the epoxy resin according to the manufacturer’s directions. You can apply the epoxy resin with a quality paint roller thoroughly covering the surface. You have to let the coating to dry for six to ten hours before applying a second layer that should also dry six to ten hours.