I was considering gyprocking a 19' x 27' room that I have partitioned off upstairs in my barn. I have insulated the walls with R20 and vapor barrier. I plan on heating the area with a small wood stove however the room will only be periodically heated. Will the gyprock (1/2 inch) get spongy or damp from the lack of constant heat? I'm in a cold climate if that is a factor. I had just heard that there might be the possibility that it will absorb water, become spongy and rather damp if used in a room such as this. Any comments?