We'll be using either traditional quartersawn clapboards from Ward Clapboards in New England or board and batten cypress for siding.

Should the siding be nailed directly to the OSB exterior of the panels? Do we need to protect the OSB from any moisture that sneaks in? Also, do we need to have a path for this moisture to escape, or can we figure it will leave the same way it got in?

Thanks, all.