Bryan Scholtes wrote:

I am finishing my basement. I used Tapcons to secure PT 2x4 to the
basement slab.

After a week of heavy rains, I noticed that all the screw holes were
weeping water. There was definite circles of moisture (but not
standing water) coming from underneath the bottom plate.

-snip-

2. I am considering pulling each screw and injecting silicone into the
holes, then re-driving the screw. What do you guys think?

What you need to do is eliminate the water under your slab. You are
wasting every bit of money and effort you put into that job until your
water problem is fixed.

I was also
considering polyurethane foam or epoxy. If I shoot epoxy down the
hole, I'll NEVER get those bottom plates off.

I don't think that epoxy is a good idea--- but why would you ever want
to take those bottom plates off?

Jim