Every home has penetrations from either the slab or flooring, I can’t think of a single exception. So if you have an example let me know about it. Every time a pipe comes through your slab or flooring there is a chance that termites might exploit the opportunity.
On top of this, there are often issues at the time of the pretreat. Construction proceeds and after we do that pretreat we never know what happens to that hole where the pipe comes up. Often times there is soil piled up and sometimes it is removed and guess where the termiticide is? Gone and there is no protection. So those are the areas where we all need to be vigilant and pay attention to walls and other fixtures.