Bruce:

Even if they install the drain lines properly, often the drywallers, tile setters and cabinet installers will liberally ventilate these lines somewhere between the pans and the terminuses (termini for you Latin lovers). How many of you run water in the pans to see if it actually comes out (only) at the end of the drain line? Ever see weeping sill plates? I mean, other than when they pressure wash new garage floors and the interior floors flood.

Of course the basement could have been intended by the owner to be like a hot tub. But, that would open a whole other can of worms . . .

Aaron