Carpet tile installation over concrete
I'm putting in carpet tiles in my finished basement. These are commercial tiles, not the Flor/Legato "home" versions.
Historically, the basement mildly floods about once every two years. I *think* we have that fixed now, but can't be 100% sure as it is below grade.. so that is an important consideration. The tile I've chosen does have an impervious backing and will be just fine - it's only the adhesive that I'm still at all concerned about.
Other than that, the floor is generally dry. It passes the "tape a poly sheet down" moisture test; would it be a good idea to do a full calcium chloride test?
All of the installation instructions seem to be either for easy-DIY installs ("you don't even need glue") or are the heavy commercial instructions.
I lean towards just using the commercial installation instructions - full spread of adhesive, etc - but can't find any good information on how this performs if the subfloor ever floods. And it sounds like overkill, though maybe that's not a bad thing.
The floor was level enough for the old, heavily padded shag carpet, but there are a couple of rough spots. There's minor pitting where the old tackless strip came up, and what looks like a cut-off, concrete-filled pipe sticking up slightly. I can't puzzle out what it used to be, though whatever it is it's been plugged with concrete for at least 30 years, possibly 50. My understanding is that I really don't need to worry about these spots and can just carpet over them - basically, this isn't ceramic tile or even VCT when it comes to a perfect subfloor.
I will be cleaning the concrete with TSP prior to installation in any case.
I've also considered the double-sided tape, and read about the "5-dot method" of daubing adhesive on the back of each individual tile. How do those methods work? Using tape is certainly appealing if the performance is acceptable.
Also, I do need the adhesive to be releasable. Part of the reason for using carpet tiles is to be able to remove them when they become soiled/stained/wet, so a "releasable" adhesive is a must.
Any thoughts? How should I proceed? Am I missing anything important here?