I have used aluminum on my facias for that very reason.
I really prefer real wood on a log home, but maintaining wooden facias in my climate is tough.
I bent them in a brake and Installed them.....but I don't really like the dimpling you can sometimes get with wide facia aluminum, especially during sunny days even with pre-drilling holes.
I should have tried siliconing them on, or maybe a heavier gauge.
I think I might remove some of them on the south east side this summer or fall and glue them on with silicone.
www.darncarpenterdrills.com This web site should Help!
We have about 8 carpenter bee holes each year, but we spray the powder in them and install a 1/2" cork so we know which holes have been treated. We discover them quick and treat them. They are not usually in the logs, but in the eve facial boards or porch roof beams. There is a special rubber bulb with a long metal neck to spray insecticide powder in the bee holes available on the internet. I never have seen one or the powder in a local store.
I just finished writing a blog post on this very topic! Carpenter Bee season is coming up, and there are several options in the blog on how to deal with Carpenter Bees and in doing so keeping the woodpeckers away. Hope this helps! http://www.logfinish.com/LogBlog/
We found the solution for everyone with fly problems! www.denythefly.com A friend of ours found these people and recommended them to us. We can't thank them enough. Check out their website - - we have 1/10 the flies after they sealed our home. We have always been inundated with flies. Not anymore!!! We highly recommend them to all log home owners. What they did even made our house warmer - - no more drafts. And they were very professional - - the type of people you enjoy doing business with. The name of the company is "Deny The Fly Log Home Maintenance". Their number is 406-721-2399. They are located in Montana, but I do know that they travel.