We decided to rip out the carpet from our basement rather than try to
dry it out. Although it has no padding underneath and shouldn't be too
difficult to dry out, we had already been thinking of replacing it anyway.

We found a wonderful deal on some closeout 2'x2' carpet tiles at the
local home improvement store but now are wondering whether we should put
down a subfloor of OSB or plywood over Delta-FL (http://www.deltafl.com)
or something similar (if it exists).

Or, since carpet tiles will be easy enough to pick up and dry out if we
get water in the basement again, is it worth bothering about
underlayment at all?

Perce