The room is about 10 by 15. The heat source is the gas fireplace. It has two windows and is not damp.
How did this evolve??? I decided to move my expensive purchased handmade paper out of my damp and at times wet studio to under my bed. Hard to get at but at least it is dry under there. I felt so frustrated, so I had asked myself the question, well what is it in my power to do about these papers getting ruined? I couldn't easily change the studio itself. So, voila, move the papers.