What does a pretreatment do, and what does it not do?
A pretreatment places a barrier in the soil before construction, so a colony that reaches the foundation meets treated ground rather than open soil. It does not make the building termite-proof, and it does not replace the moisture, clearance and design measures that keep wood dry.
The barrier is a treated band of soil that the colony has to cross to reach the structure. A pretreatment is most useful at the slab edge, around pipes and conduits that pass through the soil, and along any footing where a form was removed. Those are the gaps a colony uses, and they are the places the barrier is most important.
A barrier is not a permanent seal. Soil moves, concrete cracks, pipes settle and the product breaks down over time, so the barrier is a layer in a longer defense. The record and the monitoring schedule are what tell the owner whether the layer is still doing its job.
A pretreatment also cannot fix a design problem. A wood board that touches the soil at the slab edge, a crawlspace that stays wet or a stucco line that holds moisture against the foundation will still give the colony a route, whatever is in the ground.
Why is a new lot a better time to act than an established house?
On a new lot the soil is open, the footings are not yet poured and the barrier can be placed where it is needed. Treating an established house later means working around finished floors, plumbing and landscaping, which is slower and less complete.
Access is the biggest difference. On an open lot the technician can reach the soil along the entire footing line and under the slab area before the concrete goes in. Once the slab is poured, the only access is through the edge or through drilled holes, and those holes are a compromise.
Timing also matters for the species. The UF study in February 2026 reports the Formosan and Asian range is still expanding, so a lot in Duval County is not a lot that is safely out of range. Setting the barrier while the soil is open is the most reliable way to meet a colony that arrives later.
The cost of working on an open lot is lower than the cost of retrofitting a finished house. That is a point about effort rather than price. No figure is given on this page, and the price is confirmed on site after the plan is known.
What should the builder and the owner ask for in writing?
Ask for the zones treated, the product, the rate, the date, the operator and the monitoring schedule. A pretreatment without a written record is hard to check later, so the paperwork is part of the job.
The record should list each zone by its place on the foundation plan: the slab edge, each utility penetration, the footings and any pier. A zone that is not listed was not treated, and an owner should be able to see that on the page.
The product and the rate should be on the record exactly as the label requires. A homeowner does not need to understand the chemistry to check that the label was followed and that the operator's name and certification are written on the paperwork.
The owner should keep a copy for the building file, along with the monitoring schedule. A future buyer or inspector may ask for the pretreatment record, and it is much easier to produce on the day than to reconstruct later.
- The zones treated, mapped against the foundation plan.
- The product, the label rate and the amount used.
- The date and the name of the certified operator.
- The protection plan until the slab is poured.
- The monitoring schedule for the first years of the structure.
What can damage a pretreatment before the slab is poured?
Trenching, fill delivery, foot traffic and rain can each disturb the treated soil. The plan should say how the zone is protected through the build, and the builder should know which trades are working over the treated area.
Trenching for utilities is the most common disturbance. A trench that crosses the treated band cuts through the barrier, and the crew may not know it is there. The plan should mark the treated zone on the site so trenching is planned around it or the zone is retreated afterward.
Fill delivery is another risk. Fill that is brought in after treatment can cover the barrier and bring in debris, so the plan should say when fill arrives and whether it must be placed before or after treatment. A fill that is placed over a barrier without a note on the record is a gap.
Rain can wash a surface treatment before it has bonded to the soil. The technician should note the weather at application and any rain that followed, and the record should say whether a retreatment is needed.
How does a pretreatment fit a longer plan for the house?
The pretreatment is the first layer of the house's termite plan, followed by the inspection, the moisture and clearance work, and the monitoring schedule. Each layer needs its own record so the owner can see what was done and when it should be checked again.
The first years of a house are the most useful time to watch the structure, because nothing has been damaged yet. A monitoring visit in that period is a cheap check that the barrier is still in place and that no new route has opened at a utility penetration or a footing.
Later, the owner may want a termite inspection at each property sale or each few years. The pretreatment record is the baseline those inspections compare against, which is why the record should be kept with the house documents.
A pretreatment is also a reason to think about the landscape. The clearance from the foundation and the moisture at the wall still matter, because they decide whether the barrier stays dry and whether the wood above it stays out of contact with soil.
