I have purchased the 1/2 inch echo soft + tiles. I am installing them on our cement garage. Do I need to put a moisture barrier down under the tiles? We live in a humid area, so the floors to get some condensation, but not much, and not often.

Our Eco-Soft tiles are completely waterproof and can be installed on a subfloor without a moisture barrier. If you are worried that the conditions of your floor might lead to a mildew problem then it may be smart to lay down some sort of underlayment in order to prolong the live of the tiles and to avoid mildew on your floor under the tiles.