Not true. Just because he hasn't had a failure doesn't mean it won't happen. I reclaim barns , and I've seen whole sections of floors collapse because of them. It depends on the type of wood and how much load it carries.
From what I've observed, they prefer wood around the edges. Usually wood further into a barn is spared. I think it's because the outer boards receive sunlight and warm them. Maybe it's something to do with hatching their eggs.
Any soft wood they love, but they especially love poplar. I've seen a poplar 2x8 break because of their boring. It doesn't take a lot of holes, just 1 in the right place.
Company I worked for recommended that option to curb mole (and armadillo) activity. You have to get a lawn treatment from a Scott’s or Tru-Green tho. One customer did it and their yard ceased being ground zero for both varmints.
Here's something I found interesting this year about the carpenter bees. As I recommended I sprayed my fencing and hung up two bee traps, we've all seen these. They look like a bird house with a small jar screwed onto the bottom. I've had these up in the past and they work well.
Within days I had trapped a wood bee in one of the traps. This bee is still alive after 7 days, which is very unusual. Normally they seem to die in a day or two. A couple of days later I caught another bee in the other trap, it died overnight.
The two bees look similar but with a bit different in the amount of yellow verses black. I'm thinking the one who refuses to die is a queen bee. B***h from hell,
Soapy water in a spray bottle or soapy water in a bottle with a hole in the cap to act as a sprayer.
brake cleaner - cheaper than WD 40
All of the above will kill the males you see but not the female and the eggs.
To destroy the nest and eggs you have to jam a flexible wire as far as you can into the hole. This breaks the pollen chambers the queen builds around the eggs. Then you could use wasp spray, Tempo Dust, Repel clothing spray with Permethrin, then plug the hole.
Ok, so oddly enough I was doing yard work today and quickly found out there were two carpenter bee nests in the wooden mailbox stand. I first sprayed both holes with WD-40 and walked away. At some point two carpenter bees slogged their way out of the holes and died on the sidewalk. Then I notice a male came back from wherever he was and was buzzing all around the mailbox. I couldn't get him with WD-40 as it doesn't have the reach. I busted out the wasp spray, hit that sucker once, twice, then a final third time and he just wouldn't quit. Apparently they are even immune to wasp spray which is why I edited my previous post. I broke out the tennis racket and finally took him down. Then I hit a second one with the tennis racket and squished him. I then rammed the WD-40 plastic extension sprayer as far as I could into both holes and sprayed until the WD-40 came back out. Lol
I'll have to keep an eye on those holes and then ultimately fill them in.