Local Treatments in San Juan Bautista, CA

Local Context

When the Structure Is the Artifact, You Treat the Member and Not the Building

San Juan Bautista has more buildings worth preserving per block than almost anywhere in California, and that changes the treatment math. Where the wood in question is a viga end, a lintel, a balcony joist or a run of porch framing, all reachable, identifiable and limited in extent, a local treatment addresses it directly. Drill-and-inject puts termiticide foam or liquid into the gallery system inside a member. Orange oil (d-limonene) works on drywood galleries we can reach. Borates soak into bare accessible wood and stay there as a preventive layer.

That fits the buildings here better than it fits most housing stock. Adobe and masonry walls make a full-structure tarp seal difficult, and the infested wood in those buildings is frequently a defined set of members rather than framing throughout. The 19th-century wood-frame houses around the plaza often show the same profile: drywood activity concentrated in exposed eave tails and balcony framing where swarmers landed, with sound wood elsewhere. When that is what the inspection finds, tenting the whole structure is more disruption than the evidence calls for.

It has real limits and we say so. Local treatment only works on what we can reach. If drywood evidence turns up in several separated areas, or in attic framing nobody can get to, spot-treating the visible galleries leaves live colonies in the building and buys about a year. In San Juan Bautista that judgment usually comes down to whether activity sits on the accessible exposed wood or has moved deeper into the structure, and the inspection is what settles it.