I used the blu lumber for building my barn, which is basically steel "miracle" trusses with horizontal 2x6 in between, mostly for providing a fastening point for the steel siding. If you look at some of the videos I've posted, you can see them in the background.
The blu lumber is treated with some kind of chemical that is supposed to make it termite and mold proof. It cost me about an extra $500 for the lumber to do it that way.
What I learned:
- If I understood them correctly, the chems were applied at the lumber yard. I know this because I complained about the fact that the blue kept rubbing off on EVERYTHING.
- It does not penetrate enough to make the entire piece blue throughout
- When I mentioned it to our building contractor consultant, he said there just wasn't enough of a moisture/mold problem here in California to warrant it.
- I think it's targeted at the south east US climate
- I asked if it could be used for sill plates instead of pressure treated, and they said no!
I have my concerns about just how good something can be that gets applied like that and doesn't penetrate all that deep. I just came away feeling like it was gimmick. YMMV. Basically, seems like every exposed end would still be an entry point for termites.
Just due to the mess (I had blue clothes!), I didn't use it on the house.