We built a home twenty years ago and used wooden, cedar clapboards on the exterior. The builder didn’t strap over the Tyvek and we developed severe wall rot after a number of years. We literally replaced studs and sheathing and then used tar paper and strapped the walls etc., but we still cannot keep paint on any of our three buildings. The top of the barn wall which is outside of the in insulated loft is fine.

On our garden shed we removed siding, strapped the wall vertically, and installed screening vents at the bottom of the vertical strapped cavity and drilled two-inch holes at the top of the strapped cavity into the open attic space for air movement. We still can’t keep paint on.