Yeah, I have wood bees in my carport, too. My car is covered by yellow stuff and sawdust! Chuck says they don't bore into treated lumber. I've had a "little" luck spraying with Tempo, but have to do it more often than the label says. I like that stuff b/c you can use a pump sprayer and stand back and get a pretty far shot without being covered. Plus, it works for most all other bugs (ants, scorpions, spiders, flies) and is safe for pets after it dries. Supposed to have a residual effect.