I'm building a log cabin by reassembling an 1800's log house. I have some old barn wood than i just took off an old shed, denailed them, and stacked them with air-spacers. I would like to use the old boards for the exterior siding on the eves above the logs. The logs will go about 13' high and the top of the roof ridge will be about 18' so the barn wood would be used in that 5' eve area. Any problems using old barn boards i need to be aware of? Should i power wash them first? Any special treatment?