Is it just some condensation or is it puddles of water?
I can not stress the importance of the above enough. Even in areas that traditionally did not require permits, that is changing....a lot of it being revenue driven.As a note, I realize you did not ask, but conversion of a garage to living space typically involves a number of building code driven changes, which could include egress issues, firewall separation between the garage and the house, floor loading, heat, electricity etc. Unless you live in an area that does not require permits and has no building code, or you plan to perform the work without getting a permit (not recommended), you may want to start your project by having a chat with your local building inspector.