I'm dealing with a bit of a problem at my house in Texas. Nearly ten years ago, piers were installed, and since then, I've noticed quite a few bugs getting inside. Initially, I thought it was just a sign of an old home that wasn't well sealed. However, after removing an old wooden deck that was about 6 inches off the ground, I discovered a noticeable gap underneath the slab that I can reach my hand into. It looks like the area was poorly filled after the piers were dug, and I suspect the bad drainage is contributing to the issue. I've put in gutters to help with drainage, but I worry this void is allowing airflow where the plumbing runs through the slab, which might be where the bugs are coming from. So, what's the best method for filling this gap? I haven't seen any leaks, the soil seems dry, and my water meter is still reading normally.
1 Answer
Instead of mud jacking, you might want to consider using non-expanding foam like Great Stuff Windows and Doors. Since you can fit your hand under there, it means that the slab is above grade. Just keep in mind that insects may still get through foam, as they can with dirt. For new builds, there are also stainless steel meshes that attach to pipes embedded in the slab, plus special tapes from brands like SIGA that can help seal the foundation to the sheathing. Otherwise, bugs can crawl in under the mud sill too, and those gaps around door sills are another entry point!
Wait, so bugs can actually get in through concrete? What about the plumbing pipes that go through the slab – are they not sealed? I’m currently getting my sewer line replaced and I’ve noticed tunnels under my house, plus my slab’s on piers after foundation repairs a decade ago. Should I be concerned about bugs getting in?