Termites love the parts of a house you can't get to — inside walls, high eaves, deep framing. Here's how those inaccessible infestations actually get treated.
One of the most common worries after a termite diagnosis is location: "It's inside the wall — how do you even treat that?" It's a fair concern, because termites gravitate toward exactly the parts of a home you can't easily reach: inside wall cavities, high in the eaves, deep in the attic framing, under floors. The good news is that the treatment method is chosen precisely to solve that problem. Here's how inaccessible infestations get handled.
Why "Reach" Is the Whole Ballgame
Termite treatments fall into two broad camps: localized treatments that address a specific, accessible spot, and whole-structure treatments that reach everywhere at once. The single biggest factor in choosing between them is accessibility. If activity is confined to a reachable board, a localized treatment works. If it's inside walls, spread across the framing, or in spots no one can physically get to without demolition, you need a method that doesn't depend on reaching each spot by hand.
Whole-Structure Methods Reach What You Can't
Tent fumigation is the answer built specifically for inaccessible infestations. Sulfuryl fluoride gas penetrates every piece of wood in the sealed structure — inside wall cavities, under floors, into the attic, everywhere — because a gas goes where a needle or a spray can't. That's the whole reason it exists. We walk through the process in what happens during tent fumigation.
Heat treatment works on a similar principle for a zone or structure: it raises the wood to a lethal temperature (135–150°F) throughout the treated area, reaching termites inside the wood without needing to access each gallery directly.
Both are designed for exactly the situation where "I can't reach it" is the problem.
Where Localized Treatment Still Works
If the infestation is confirmed to be in an accessible spot — a fascia board, a door frame, an exposed rafter — then orange oil, spot/injection, or localized heat can treat it directly, and you avoid whole-structure treatment. The catch is certainty: localized treatment only addresses what's found and reachable, so it's the right call when the inspector can confirm the activity is contained, not when there's uncertainty about how far it extends. Our fumigation vs. no-tent breakdown covers that trade-off in depth.
The Decision Comes Down to Extent and Access
| Situation | Typical approach |
|---|---|
| Confined to an accessible, confirmed spot | Localized: orange oil, spot treatment, or targeted heat |
| Inside walls / spread / can't be fully mapped | Whole-structure: tent fumigation or heat |
| Subterranean, from the soil | Soil barrier (Termidor) targeting the ground route |
The reason this matters: if an inspector can't fully map an infestation, treating only the reachable part leaves the hidden part working. That uncertainty is the most common reason whole-structure treatment gets recommended — not upselling, but the honest limitation of only treating what you can reach.
The Bottom Line
You don't have to reach the termites yourself — the treatment method is chosen to do that for you. Inaccessible infestations are exactly what whole-structure methods are for, while confirmed, contained ones can be spot-treated. Which applies to your home is what an inspection determines. A free inspection maps the activity and matches it to the right method — reachable or not.