I am working on a historical barn in AZ. I have been told to caulk the board and battens on the horizontal joints. I disagree. I don't think you should caulk anything on board and batten siding, esp. on a barn! The board and battens only cover the lower third of the barn siding, above them are cedar shingles. Between the board and battens and the shingles above is a cove moulding topped with a drip cap that extends roughly 1" beyond the siding. The board and battens also rest on a skirt or band board below. Both the skirt board and the drip cap are bevelled to allow water to flow away from the building. Am I correct?