I am sharing this to hopefully help someone else out. I came up with this on my own after reading a lot about this problem. These bees had returned outside my home about 16 feet in the air, in a large mass in a small 1/4 inch X 2 foot long gap, going into the trimming on my large house, that is in good shape. They came back every year from about April to September. I had tried several things that didn't work. This is what has worked for me and has kept them away.
Get a bottle of De-Solv-it (at Wal-Mart or Ace Hardware), and DAPtex Plus Multi-Purpose Foam Sealant (shoots with a straw that comes with it). At almost dark, or night with a flashlight - shoot De-Solv-it in the holes. It is greasy like WD40, and most importantly, is in a citrus solution that insects hate. Seal the holes with DAP through the straw, then spray De-Solv-it all over the outside. GENTLY wipe the excess of DAP off, taking only what's on the outside. The Dap on the inside is going to expand and get hard. Don't waste your $ on anything else but this DAP Product I've described, as this one is easy clean up afterwards. It is the only one I've found where you can rinse out the straw and spray nozzle with warm water, and reuse.
Good Luck!
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At an apartment that my husband and I lived years ago, we had problems with carpenter bees; however, when we would fill the holes as suggested in the post, they would find a way to drill themselves out through another hole. Maybe it will work where you live, but did not for us.
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