Concrete slabs form an important part of termite management nowadays, with slabs being used as termite barriers as they are considered termite resistant (if poured in accord with AS2870) the only potential problem is where pipes or other materials penetrate the slab. Whilst things such as plumbing and electrical conduits are easy to locate and treat, sometimes there are building practices that inadvertently create penetrations through the slab, such as when putting in temporary formwork during construction of slabs, as demonstrated by these photos.
Reo bar used to peg out the step down in wet areas of this slab were left in place, creating a termite highway!
It is important to check all potential entry points by ensuring no penetrations through the slab are left untreated.