Why treat the soil before the slab is poured?
Because a poured slab and finished grade cover the soil permanently. Treating open ground lets the product reach footing trenches, slab areas and plumbing penetrations directly, and avoids the drilling that later treatment needs. It is a one-time window in the build, which is why timing with the builder matters.
Termites do not need a big gap. Hairline cracks, expansion joints and openings around pipes give them a route into a slab house, so the treated zone is meant to be continuous.
When in the build does pretreatment happen?
It happens after grading, forms, footings and plumbing rough-in are in place and the soil is exposed, but before the vapor barrier and concrete go down. For a stem wall or crawl-space foundation, it also happens before backfill. The exact order depends on the builder's schedule and weather.
Rain can be a problem right after treatment if it washes product away or the label requires dry conditions. Tell the call line about the pour date so the visit is timed well. Same-day visits are possible only when a technician is free.
Does pretreatment mean the house is termite-proof?
No. Pretreatment lowers the chance that termites reach the structure through the treated soil, but it does not make a house immune. Landscaping, new utility trenches, wood-to-soil contact and moisture can all create gaps later, so an annual inspection is still a sound habit.
A new house also adds wood that termites find attractive: porch posts, fences, and mulch beds. Keep soil and mulch below the siding line and watch for tubes. See termite inspection for follow-up checks.
What if I am building an addition onto an older house?
An addition is a chance to treat soil on the new section, and a good time to have the existing house inspected too. The old part may sit on piers over a crawl space, and the new part on a slab, so the joint between them is a spot to check for termite entry.
If the old house has a crawl space, ask for it to be inspected before the addition is tied in. See crawl space pest and moisture work for what that involves, and termite control if activity is found.
What should a builder or owner tell the technician before the visit?
Tell the technician the foundation type, the planned pour or backfill date, whether plumbing and electrical rough-in are done, where stumps or fill were removed and who will be on site. Treatment has to happen while soil is open, so accurate timing information is what makes the visit useful.
Send the plans or a sketch if you have them. Garages, covered porches, patios and steps often get forgotten, and they are exactly the slabs that termites reach first when they are left out. Ask the technician to include every poured surface that touches the house.
If the schedule slips, call again. A treatment done two weeks before a delayed pour may need to be rechecked, especially if rain, equipment traffic or re-grading has disturbed the soil in between.
What records should I keep after pretreatment?
Keep the written record of the date, the areas treated, the product used and the company that applied it. It helps with later inspections, warranty questions with the builder and any future sale, when a buyer or lender may ask what was done before the slab was poured.
File it with the house papers rather than with the builder's invoices, so it travels with the property. A record is also what lets a future technician know whether treated soil may be present before they trench or drill around the foundation.