The treatment is more than simply spraying..they inject a chemical into the soi using long rods and need to drill through any conrete to form a complete barrier. Most treatments are good for at least 10 years.
Yes the $120 a year for inspection is alot but it most likely includes some sort of guarantee anywhere from a retreatment if termites are found to an assurity bond to cover termite damage...each company is different.
Almost certain most home owner insurance policies will EXCLUDE any damage from wood boring insects...so you are on your own.
For new construction I thought the soil was treated before the slab was poured
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