I’m in the process of building a summer cottage. It is winterized and the heat will be left on at about 45 degrees all winter, unless we are there, at which time we will turn the heat up to more normal temperatures. I am about to start doing the window returns and I love the look of knotty pine. The returns are about 5 1/4″ wide. Has anyone ever seen this done? Is knotty pine stable enough? Will I have a problem with knots falling out years down the road?