I had problems with a damp basement for decades. A friend who is in business for himself in the building trade recommended I have the cement block walls sprayed with foam. I had home stud out the walls so it would give me 6 inches of foam to the outside of the studs. I am so glad I did it because now I have no dampness problem and the basement which has no heat is a lot warmer than it was prior. It is a two part foam that mixes in the air as it is being sprayed and it gets very hard when it dries.