I read in Jack Sobon's Timber frame construction book that using a dry laid foundation, there would be enough air circulation that the sills need not be pressure treated. Is this true? It seems that the stone would still sweat enough to rot the sills. Most of the old barns in my area eventually needed renovation due to rotted sills but these were all built on mortared stone foundations. Not that the building inspectors would ever let you build on a dry laid foundation, I am still quite curious. thanks tb