Must be different in Fla. than around here. If it is an all steel building and a concrete slab, why does it have to have any pesticides at all? Is it just to keep the termites from having a damp dark place to breed? In our area, if it is a steel building, it is put on top of a slab. If it has a block foundation, the the top course of block is either a "termite" block meaning no holes, or if they use cored blocks, then the top course is filled with cement. Then it is required to have a sill plate made from treated lumber. They used to use a sheet of aluminum for a termite shield on the top course. A pole barn has to have treated lumber post and treated boards at the bottom to pour the concrete against. But it is interesting that the different geographical locations vary so much. I remember quite a few years ago on an episode of This Old House, when Bob Vila was the host, that he visited a house in California that the contractor was building homes, with basements, that the complete basement wall and foundation was made out of treated plywood and treated 2 x 4's. I wonder if that contractor is still in business or if he ever had a major class action lawsuit against him? ANd for what it is worth, treated lumber USED to have a 40 year warranty. This was for wet locations and / or ground contact. I tore a deck out that I built 13 years ago and some 2x's that had ground contact were rotted away. Makes you wonder.
Kevin