I have a barn-garage type outbuilding (I believe it was a small barn originally; it has that kind of tall, roomy upper loft). It's about 40 by 20 feet. It's got a concrete foundation and the lower part is divided into two equal sized rooms.
I'm thinking about taking one of the lower rooms and making it a little more hospitable to hang out in and do projects. It would mean patching some wall, adding real doors, and insulating and sheetrocking it.
I want to keep the floor as bare concrete so I can anchor machine tools etc to it for ultimate rigidity. But if it's sharing a concrete foundation with the other room, is heating it in the winter going to be practical? (This house is in the US Pacific Northwest; it gets fairly cold.) Is the floor going to be a giant heat sink?
Are there are any other things I'm not thinking about here, where moisture or heat concerns might bite me if I'm just insulating and heating one room in this larger structure?