its a 130 year old corn crib, (airy barn,) that a client wants turned into a sustainable guest house. I am attaching a greenhouse for passive heating, supplemented by a wood burning stove in the sitting room. ( N. GA mountains). Half of the barn will be a bedroom. It currently has 1x3 horizontal battens, spaced 1" apart, that they want to keep exposed for historic value. It is framed with rough cut 2x4's usually spaced about 20" apart. I'm thinking of cutting hardi board, that I pre-cover with a creamy white stucco, to place in between the 2x4's up against the battens on the inside. THis will create a chinked look from the outside. Then place a layer of 2"-3" foam on the inside to insulate between the 2x4's. Then cover with this with a stucco or plaster or hot drywall mud, then top with a clear coat. I would trowel on this finish and knife it up to the edge of the 2x4's. This keeps the 2x4 studs exposed on the inside, and actually on the outside too.
One of my biggest concerns is that the humidity and excessive hot and cold that this building might experience during times of vacancy could cause cracking, mold, flaking, etc. to the interior finish.
Suggestions? Am I going to get anything to stick to foam board? Do I need to use a wire mesh? Should the foam be textured or is a standard smooth finish OK?
How about another layer of Hardi for the inside? Or does drywall come into play here?
One of my biggest concerns is that the humidity and excessive hot and cold that this building might experience during times of vacancy could cause cracking, mold, flaking, etc. to the interior finish.
Suggestions? Am I going to get anything to stick to foam board? Do I need to use a wire mesh? Should the foam be textured or is a standard smooth finish OK?
How about another layer of Hardi for the inside? Or does drywall come into play here?