Construction Question???

[Zedder]

We have made a deal on a new house and are having it constructed over the next year. It has an attached 3-car garage (we're in the city) and I am going to have them build a wall with a door between the two-car garage and the third bay to keep the bikes, garden stuff and garbage cans away from my cars (when I get some again one day after paying for this darn house ). The builder was going to build the framed/drywall wall rght on the slab but I don't think that is a good idea for fear of mold and rot from any potential moisture. I have suggested that they build a cement curb between the two bays and build the wall on top of that given that it is not a load bearing wall. Does this make sense??? Any better suggestions out there? Thanks in advance