In the last 2 years I have been buying rough lumber off Craig's list, and this and other forums. I was told that some was air dried (some walnut and some oak) and others I was told was kiln dried ( cherry and walnut ) but I am not so sure it was. Anyway, recently I found some of the oak with powder post beetles - the holes and the frass ( dust ) indicating live , and some of the cherry and the walnut have the holes, though I can't be sure if there is frass or not and have decided the best course is to treat everything. From the internet I found that heating 4/4 lumber to temp of 130 or more for 2 1/2 hours or more will kill off the ppb and so I built a very small kiln on wheels, and have run a few loads through with no problems. Now that works though, I am not sure how far apart I need to keep the treated ( heated ) from the untreated. I have a small pressure treated lumber and black pipe rack - can I put some of the treated boards back on the lumber rack so long as they are not touching and are above the boards that haven't been treated. I stored the first few loads in my garage, but I am running out of room and life would be easier if I could take it from the rack one level at a time, and them return it to the rack but I have no idea how the beetles get from one board to the other. ( I considered putting swine flu masks on all the unifected boards - but that was too expensive ) Any suggestions apprecitated.