I sprayed each room as I found ants and called a local exterminator to come help since all this time I hadn't seen a single fire ant coming into the house in the foundation or any nests near the house. We had some fire ant beds in the yard, but none near the foundation.
The bug guy came out and dusted the attic, sprayed the house and yard, and baited the yard (this is now a week since the first outbreak in the master bath) and for about a week this seemed to do the trick. We saw some stragglers which was to be expected, but nothing big for a few days. Then two separate days we had a line of ants going into our living room from an exterior wall. I sprayed more Ortho and checked outside, and as before nothing... no ants coming into the foundation were seen. The day after this they moved into the attic and were coming out of a near by air duct which was just freaky!
I called the bug guy again and he came out and put gel bait outside the house above the foundation and said they were probably attracted to the moisture in the air duct which is why they went up there. We continued seeing them coming out sporadically for a day or two, but I put some Ortho on a paper towel and rubbed it against the vent which seemed to stop them.
We were then bug free short of a few in the bathrooms at times for about another week then our kitchen was hit, which is on the complete opposite side of the house from any other area that's been hit to this point. Our sink sits on an island surrounded by two pillars that go floor to ceiling, and literally hundreds of fire ants were coming out from a small hole where the countertop, wall, and backsplash met and were attacking the sink. I wasn't sure if they were coming from that attic or what, but the bug guy said he's pretty sure they were coming up from the pipes in the foundation. He dusted in the hole then behind the sink where the pipes come up plus in both bathrooms. We haven't seen any ants in the kitchen, but on Monday we had an invasion in our front bathroom from under the baseboard that's opposite of the toilet, sink, or tub. The bug guy had told me not to use Ortho since it could counteract what he put down, so I just soaked the floor in Clorox Bleach bathroom cleaner and that did it... I haven't seen any more there since that night.
Since then we've seen a few in the other bathroom plus some dead ones in the living room where both the bug guy and I have sprayed, so I think they're still trying to come in. But the thing that sucks is still I've seen zero ants in the yard or on the foundation. I walk the house inside out several times a day, and outside seems to be doing great.
So my only conclusion is they're either in the attic or in the foundation, but I'm leaning more towards the foundation. So with that is there any chance in getting rid of them??? I'm literally to the point of cutting holes in the walls to expose the pipes and where they enter the house so we can cover it in ant bait or poison in hopes that does the trick. The dust the bug guy put down was just sprayed behind the cabinets, but I want to bait the things so they'll take any poison back to the nests and kill the suckers.
Has anyone ever heard or seen such a fire ant invasion? We're in Central Texas so fire ants are common, but I've never heard of them this bad. The bug guy said he was dumbfounded and would have someone with more experience with fire ants come out, but in the mean time I'm at a loss on what we can do. It seems these little turds can literally come out of any place in the house at any time, and with a 3yo and new born that's scary.
Thanks for any advice or suggestions... And sorry for such a long post, but hopefully this gives anyone with experience with pest control some pattern's I'm missing.