Termite control in Napa, CA has to account for two different termites, because California, and Napa in particular, has both. Subterranean termites nest in the soil and must keep contact with it, foraging up into the structure through foundation cracks, plumbing penetrations, and the mud tubes they build up a foundation face, then feeding on framing from the inside out. They swarm in spring, especially after rain. Drywood termites are different: they live entirely inside the wood with no soil contact, colonizing attic framing, roof eaves, fascia, and window and door trim, and they are especially at home in Napa's older housing stock, the downtown Victorians and Craftsman bungalows built from aged redwood and old-growth lumber. They swarm in the warm months and leave little piles of six-sided pellets that look like sawdust or coffee grounds below the infested wood. The two need different treatments, so the first step is always an inspection to identify which termite, and where. An experienced local exterminator inspects the slab, crawl space, attic, and trim and matches the treatment to what is found.
Two termites, two problems
Subterranean termites are the soil termite. In Napa they exploit slab cracks, expansion joints, plumbing penetrations, crawl-space piers, and any wood-to-soil contact around the porch, deck, fence, or foundation, and the clay soil that shifts and cracks in the dry summer gives them more paths up. The signs are pencil-width mud tubes on the foundation or crawl-space piers, hollow-sounding wood, and spring swarms of dark winged reproductives near windows.
Drywood termites need no soil at all. They fly in and colonize dry, sound wood directly, which is why they turn up in attic rafters, eaves, fascia boards, and window frames, and why Napa's aged-redwood historic homes see them so often. The classic sign is a small pile of hard, six-sided fecal pellets beneath a tiny kick-out hole, and a warm-season swarm of winged termites indoors near a window.
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Termites or flying ants?
A swarm is often the first thing a homeowner notices, and it is easy to mistake for flying ants. The difference matters because the treatments are nothing alike. Termites have a straight, thick waist, straight antennae, and four wings of equal length. Ants have a pinched waist, bent antennae, and front wings longer than the back. If large winged insects appear indoors near a window, save a few and have them identified rather than guessing.
Timing is a clue too. A spring swarm points toward subterranean termites coming up from the soil, while a warm-season swarm and pellet piles point toward drywood termites in the wood above, which is common in the valley's older homes.
How the work is done
It starts with an inspection of the slab, crawl space, attic, eaves, and trim for tubes, damage, pellets, and swarmers. Subterranean termites are handled with a liquid termiticide soil treatment around the foundation and, where a patio or slab abuts the house, treating the soil beneath, plus in-ground monitoring where appropriate. Drywood termites are handled with treatments matched to the extent of the infestation, from local wood treatment of accessible galleries to whole-structure fumigation for widespread activity, which is a common approach for older Napa homes with established drywood colonies.
Moisture correction backs it up, because damp wood and soil contact invite subterranean termites: direct water away from the foundation, fix leaks, keep the crawl space ventilated and dry, and remove wood-to-soil contact around the porch and deck. A local pro matches the plan to the termite found and the construction of the home.