Yearly bug and pest deterrent spraying around exteriors of buildings

I wanted to add to this because it might catch someone else.

I live in a cedar cabin in the mountains. The wood is untreated on the inside. Cedar is not usually attractive to insects that eat wood, but, well... Every year since we moved there, we'd get small amounts of frass (chewed-up bits of wood) from insects eating the exposed roof beams (!!!) of our house. I would spray the beams with permethrin, a bunch of dead ant-looking things would be on the floor the next few days, and that would be it for the year.

This year I called an exterminator, since it keeps happening. He said that it wasn't termites (yay!), but thought that it was some kind of beetle. (Powder post beetles are a huge problem in our area.) He said we had two options: we could either fumigate the entire house (cost: about $10k, since the whole house would need to be tented), or we could paint all the woodwork in the hose with a 1:1 solution of Bora-Care and water. Bora-Care is a disodium octaborate tetrahydrate and glycerin solution, and should poison the wood for pests, without being toxic to people or animals once it's dried. (I may also have to drill the beams in inject a similar product in order to get deep enough penetration.)

This should be a one-and-done process; I should not need to repeat it.