Gentlemen,

Thanks for all the great advice. Water can indeed be a problem. I have
good drainage, even the heaviest of rainstorms doesn't affect the
basement. But....I have a pipe running from the A/C to the outside
(condensation water), and last summer tied a utility sink outside into
this drain. My wife was filling up the sink the other day, and water was
coming out the little vent pipe inside. It went right down the gap in
the corner grin.

I extended the vent pipe of course, but it certainly supports what Frank
said.

So, I plan to use a combination of the various ideas.
- Leave the gap where it is narrow
- There are some areas I can't cover with tile (HVAC, well pump/ tank).
Coincidentally (well, probably not...), this is where the gap is widest.
I will partially fill the gap with some expanding foam (just to give it
an edge), then use some thinset (or maybe just gray paint) over it to
make it blend in
- Install baseboard along the sides. Conventional (wood) baseboard is
not going to attach easily to cinder block, so I was looking at vinyl
baseboard instead. Something 1/4" thick should do the job.

Again, thanks for all the advice.


JB wrote:
On Mar 29, 8:38 am, "Frank" wrote:
Floor painted but if tiled
would not show gap. I think you should leave yours alone and not fill
it.

Also there is no such thing as a dry basement. I've had 2 minor water
excursion incidents in the 30+ years I've lived here, both due to not
maintaining draining from downspouts. Simple extensions solved
problems but any time rain water hits side of house, there is
potential for water in basement.


I agree with Frank. I have a similar set up....finished basement with
cinder wall and concrete slab floor with a small gap. I also had some
minor water issues and was GLAD the seepage went down the gap and not
puddle on the concrete floor.

If you really want to seal the gap, why not use the "foam in a can"?
It comes in a "gap filler" formula for larger spaces. From
experience, don't try to wipe away any excess when wet. Just let it
harden up, then trim with a razor knife.

--Jeff