What the fall caching season does to a San Jose house
There is a stretch each autumn when the roof gets busy and nobody can work out why. Tree squirrel damage from food caching peaks in fall, and the behavior is exactly what it sounds like: animals moving nuts and seed to storage sites, dozens of trips a day, using whatever route is shortest. If that route runs across your roof and past a vent with tired screening, the vent becomes the storage site. This is when a marginal opening turns into a real one, and when homeowners first hear activity that has actually been building for months. It also explains a common misunderstanding. People assume the animals are moving in for winter, so they wait for spring in the belief that the problem will resolve itself. In this valley it will not, because winter lows near 42F never make the space uncomfortable. October is the month to be on a ladder checking vents and roof junctions, before caching traffic finds the weak one for you.
The permit line between two similar looking animals
California puts tree squirrels in the game mammal category, and that produces a split most homeowners do not expect. According to UC IPM, eastern fox squirrels damaging property may be controlled at any time. Gray squirrels are treated differently, and controlling them requires a depredation permit from the state Fish and Wildlife department. So the sequence is identification, then method. A company that arrives with traps before it has said which species is present has skipped the step that makes the rest lawful, and that is a fair thing to raise on the phone. There is a straightforward way to avoid the whole question. A one way door removes an animal from a structure without taking it, so it works the same way whichever squirrel is using your attic. For most San Jose homes with a single adult and one main opening, that is the cleaner approach anyway, because it puts the emphasis where it belongs, on the repair rather than the capture.
Where the openings hide on a valley home
In a wet climate you look for soft wood. Here you look for gaps, because 17 inches of rain a year and average humidity near 65 percent are not enough to rot trim on most houses. Start with the vents. Attic, gable, and eave vents come with screening built to stop insects, not rodents, and it takes very little effort to bend or tear. Next, the junctions: anywhere a lower roof meets a wall, anywhere an addition ties into the original structure, and the flashing around vent stacks and skylights. On tile roofs, the open ends at the eave give access to the batten space, which runs the length of the roof in shade. Rooftop equipment adds another category, since the sheltered space beneath a solar array holds wiring that squirrels will chew. The useful habit is to look at your own roof from across the street at sunrise. Animals use the same route every day, and watching one disappear tells you more than an hour of guessing from inside the attic.
What a first visit should establish
A worthwhile inspection produces three answers before it produces a price: which species, whether the date falls inside the late winter to spring breeding period, and how many separate openings exist. In California the first of those has legal weight, so it should not be a shrug. Expect most of the time to be spent outside and above. The operator should look at every vent, roof junction, tile end, and piece of rooftop equipment, then get into the attic with a light to read the evidence: compressed runs through insulation, cached shells, chew dust, staining, and any damage to wiring. Get the scope in writing. It should name the removal method, the material used at each opening, and what happens to soiled insulation. Ask specifically whether the follow up trip to pull the one way door and permanently seal the entry is included, since that visit is the one that finishes the job and the one most often quoted as an extra afterward.
Prevention that suits an irrigated valley yard
The landscape is doing most of the recruiting, so start there. Irrigation makes water dependable in a place that gets very little rain, and fruit and nut trees make food dependable in autumn. You do not have to remove any of that, but you can stop it leading directly onto the roof. Eight feet of clearance between the nearest branch and the roof edge cuts most of the traffic. Picking up windfall through the caching season removes the reason to travel. Fixing leaking emitters and hose bibs removes the reliable drink. Then harden the building. Back every reachable vent with quarter inch hardware cloth from behind rather than screwing mesh over the face, since the fixings on the outside are what an animal works on. Close tile ends and roof junctions with fitted metal. Cap the chimney with stainless steel. None of this evicts an animal already inside, but on a house that has been sealed properly it is what keeps the place from becoming interesting again next autumn.
Comparing quotes on a high value home
When the house is worth what San Jose houses are worth, the temptation is to assume the expensive quote is the thorough one. That is not reliable. What you actually want to compare is specificity. Count the openings each company lists. If one names six and another says entry points will be sealed, the second has told you nothing you can hold them to. Then read the materials named for each opening, and look for hardware cloth and metal rather than sealant. Third, check for the species answer and what follows from it, since the permit question is real in California. Fourth, ask whether the plan handles one animal or several, and how they will confirm the attic is empty before sealing. Finally, look at what happens after removal. Insulation replacement and any electrical repairs are frequently separate lines, and they are usually where two apparently similar prices diverge. Against a median home value near $1,350,000, the money saved by skipping them is not worth the exposure.