Why the cheapest termite treatment happens before the slab is poured
Once a house is built, the ground under it is out of reach. Treat it first and it stays protected for years, for a fraction of what a finished house costs to treat.
Subterranean termites, the ones that do the damage in Batangas, live in the ground and come up into a house through the foundation: through cracks in the slab, around pipes and along the outside of the footing. A finished house gives them a hundred ways in and gives us very few ways to reach them.
Soil treatment
Before the slab goes down, the prepared ground is treated with termiticide so that the whole footprint of the house sits on a treated layer. The termites that would have come up through it do not. It is a half day's work on an open site.
Pipe reticulation
A reticulation system is a run of micropore pipe laid across the footprint before the pour. It is then filled with termiticide, and, this is the point, it can be refilled from an access point years later without touching the floor. The house gets a treatment it can renew for as long as it stands. We lay these on sites around Tanauan and Lipa regularly; the pre-construction page has the detail.
What it saves
Treating a built house means drilling the slab edge, injecting, and sometimes opening walls, on top of whatever the termites have already eaten. Treating the ground first means none of that. If you are building, or you know someone who is, this is the conversation to have before the first truck of gravel arrives.