I have a sewing room in my finished basement but the basement gets damp and smells of mildew. This could potentially ruin alot of material. The concrete walls are covered with wallboard and painted. The floor is still the bare concrete. There are no apparent leaks in the foundation. It is a walkout basement. It is much better in the winter when the woodstove burns all winter but come warmer weather (SW Michigan) it gets cool, damp and mildewy. There are no windows in this room.