I'm trying to find a good way to seal around the pipes that enter our house behind the toilets and sinks because we're having a problem with ants coming through the gaps between the pipes. From what I remember the hot, cold, and drain pipes come in through the same hole, their just wrapped together with concrete right up to the wrap. I'd like to find something I could squeeze into these gaps that wouldn't crush the pipes yet something the ants won't find tasty. I thought about the Great Stuff Gaps and Cracks but my fear is the ants will just start moving into the foam making a new home.
This will probably involve opening the wall under each sink, which if I have to do I'll just add a plumbing access panel so I can get back in whenever needed.
As for treating the ants, we've tried Termidor (which is supposedly the best), plus we've baited outside to no avail. These pesky fire ants just won't let up, so short of doing a costly whole-house treatment of Termidor under the foundation my thought now is to just seal their access into the house.
Thanks for any advise ...