According to this termites can't survive here in the attic
Heat is a nonchemical option for treatments. Excessive heat kills drywood termites by disrupting cellular membranes and denaturing enzymes needed for their survival. The treatment process involves heating all wood in the structure to a minimum of 120°F and holding this temperature for at least 33 minutes. The benefit of heat treatment is the ability to treat the entire structure without the use of chemicals and the relatively short period of time the structure must be vacated (hours instead of days, as with the use of fumigants)
If you've been in the attic here it gets well above 120 degrees here.
So that shouldn't be an issue, just continue to look at the foundation IMO.
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