Why does a subterranean colony reach a house through soil that looks clean?
Subterranean termites need moisture and a route, not an open door. They travel through soil and along concealed tubes, so a clean-looking surface can still carry a path from the colony to the wood. Treatment is built around that path.
The first thing a homeowner should understand is that the termite is not looking for a way in through the front door. It is looking for moisture and cellulose, and it will build a mud tube or travel in the soil to reach them. The soil next to a foundation is often the easiest place for that to happen, especially where mulch is piled high or a planting bed slopes toward the house.
A concealed route is harder to see than an exposed one. A tube can run inside a cavity, through a gap at a pipe penetration or along the back of a cabinet. The inspection is designed to find where the route enters the structure, which is often a few feet from where the damage is.
This is also why a treatment that worked on one side of a house can fail on the other. Soil, drainage and wood contact change from one wall to the next, and a plan that treats the whole perimeter the same way has not looked at the routes.
How do you tell a soil problem from a framing problem?
A soil problem shows as mud tubes and soil contact at the foundation, while a framing problem shows as damage inside a wall or joist that does not match the surface signs. The two need different treatments, and the difference is found by sounding the wood and opening a small access point where needed.
Sounding means tapping the wood with a tool and listening for a hollow or soft response. A sill or stud that is hollow at the base usually has more damage than the surface shows. The technician records each point, because a damaged section that is not recorded is easy to miss at the next visit.
Moisture readings add a second check. Wood that stays damp is more attractive to termites, and a damp reading near a plumbing wall or under a shower pan points to a moisture problem that the pest treatment alone will not solve. The plan should name that moisture problem, even if the pest company does not repair it.
Where the damage is inside a wall, a small access point is sometimes needed. A homeowner should expect the technician to explain why the opening is needed, where it will be, and how it will be closed, and should not agree to larger demolition without a written reason.
- Surface signs point to the soil route first.
- Sounding and moisture readings point to the framing route.
- Access points should be limited, recorded and closed.
- Repairs of lost wood are a separate job and should be quoted that way.
What should a written plan for a subterranean treatment include?
A written plan should list the routes found, the method for each, the products and locations used, the areas that could not be reached, and the monitoring dates. Anything missing from that list is a question to ask before the treatment starts.
The plan is the homeowner's record of the job. Without it, a second technician has no way to know what was done, and a homeowner has no way to tell whether a later sign is new or an old one that was missed. A plan that is vague about products, locations or dates is not finished, even if the treatment has been applied.
The plan should also say what the treatment does not cover. A soil barrier does not repair wood, and a bait system does not close a moisture source. Naming those limits protects the homeowner from assuming the pest work has solved a building problem.
Ask for the plan in writing before any work begins, and ask who will be the technician on each visit. The person who applies the product is the person responsible for the certification that covers it, and that certification is the paperwork worth asking for.
- Routes found, with locations.
- The method chosen for each route.
- Products, locations and amounts applied.
- Areas that could not be reached and why.
- Monitoring dates and triggers for an early visit.
What can be done between treatments to keep the route closed?
Keep wood out of contact with soil, keep the crawlspace dry, clear mulch and planting beds back from the foundation, and repair leaks promptly. These steps do not replace a treatment, but they remove the conditions a subterranean colony needs to keep returning.
Wood that sits on soil is the single most common route into a structure. A stair stringer, a fence post attached to the house, a porch step or a deck board resting on the ground gives the colony a direct path. Replacing those pieces with masonry or raising them off the soil removes the path.
A wet crawlspace is an open invitation. A vent that is blocked, a dryer duct that leaks into the crawlspace, or a gutter that dumps water against the foundation can keep the soil damp for years. The Extension advice for Duval is to direct gutters and drainage away from the house and to fix leaks promptly.
Mulch is useful in a garden but needs a gap. Keeping mulch and planting beds back from the foundation gives the technician a clear line of sight and gives the colony one less place to build cover. Pulling mulch back is a small job that makes every later inspection more reliable.
When is a subterranean termite job more than a treatment?
A job becomes more than a treatment when the damage is structural, the moisture source is ongoing, or the colony keeps finding new routes after each application. At that point the plan needs a repair and a moisture fix alongside the pest work.
If sounding finds that a sill plate or a joist has lost a substantial share of its wood, the treatment cannot restore it. A carpenter or a structural professional has to assess and repair that damage, and a homeowner should keep that quote separate from the pest work so the two can be judged on their own terms.
If the colony keeps returning to the same spot, the cause is usually a moisture source that has not been fixed, such as a shower pan leak, a condensing duct or a downspout discharging at the wall. The pest company can name that source. Fixing it is the homeowner's decision and a plumber's or contractor's job.
A recurring route is also a reason to widen the monitoring schedule. A plan that was set for a quiet route may need shorter intervals once the colony has shown it can reach a new part of the structure.