The master bathroom wall swells during the winter. The buldge is pronounced, and I have a 1/8-inch gap between it and the vanity and counter. During the summer, the swelling disappears, as does the gap. This wall shares an exterior wall, and has a floor register with some directional vents pointing toward it. (When the heat or AC is on, some of the air is pointed toward the wall and vanity.) The plumbing runs through the floor, and there are no obvious signs of leaking. We leave the window and door open when showering as there is not an exhaust fan in the bathroom.
The same happens to a lesser extent in the kitchen. It, too, shares an exterior wall. Except, instead of a floor register providing a heat source, the refrigerator is on the wall. The kitchen is part of an open concept, and there is plenty of air ciculation.
No other walls in the house which 1) share an exterior wall or 2) have a floor register with directional vents pointing toward the wall have this problem. The master bathroom wall faces east, and the kitchen wall faces north. We live in the Midwest with extreme temperature during the winter and summer.
We would like to upgrade the kitchen counter and add a tile backspalsh, as well as upgrade the vanity and counter in the master bathroom. All of the work will be for naught if we cannot solve this problem.
Any ideas will be greatly appreciated. With many thanks!