Termite control? We had termites (both types! Subteranean AND drywood!) To defeat the subteraneans, 1/2 inch holes were drilled all along the EXTERIOR of the house in very regular intervals. Termite poison (Premise 75 in our case, but Termidor is likely as well) was injected into each hole. However, after doing it, the termite guys then hammered 1/2" plastic plugs into the holes and covered them with some concrete patch. There are some holes inside the house as well where we have sleeper floors in the "basement" (ie finished crawlspace).
Termites are a problem everywhere (though I also lived in Mississauga for most of my life I don't recall it being an issue for my parent's house, though at Christmas I mentioned termites to a friend in Oakville and he said he cut down a tree FULL of them). I'm in California now where every other house is infested with the buggers!
I don't know why you would want the holes in your slab, now that you have discovered them. If I were you, I would check to see if maybe it was termites. If it WAS, then maybe go ahead and inject MORE poison (it only lasts 5 years) into the holes (get a pro to do it) then get some plastic plugs, hammer them in below the surface and patch it up. If it was for termites and the poison is now gone, you now have an excellent path for termites to come back up through the holes!
It could also be that the previous owner had some unexecuted master plan to use the holes as keys for more concrete or something (like stick rebar in there and add another layer of concrete)
Vince
Termites are a problem everywhere (though I also lived in Mississauga for most of my life I don't recall it being an issue for my parent's house, though at Christmas I mentioned termites to a friend in Oakville and he said he cut down a tree FULL of them). I'm in California now where every other house is infested with the buggers!
I don't know why you would want the holes in your slab, now that you have discovered them. If I were you, I would check to see if maybe it was termites. If it WAS, then maybe go ahead and inject MORE poison (it only lasts 5 years) into the holes (get a pro to do it) then get some plastic plugs, hammer them in below the surface and patch it up. If it was for termites and the poison is now gone, you now have an excellent path for termites to come back up through the holes!
It could also be that the previous owner had some unexecuted master plan to use the holes as keys for more concrete or something (like stick rebar in there and add another layer of concrete)
Vince
