Another basement insulation question. I've reviewed several of the basement insulation threads here, but most seem to be concerned with insulating walls to keep the heat in from a stove. My situation is a little different. I'm in an 1860's farm house with two big rooms that make up the basement, and two above that which make up the first floor. In the basement, the sills and the walls are uninsulated. I'm heating the first floor with a wood stove in one room (into exterior masonry chimney with an insulated flex liner, block-off plate, etc) and the other side of the house is heated with a pellet stove. The floor of the first level can be quite drafty at times. I suspect that the heat on the first floor is helping to encourage drafts from the basement. The floor on the first floor is an old wood floor and occasionally there are slight gaps in between the planks that let cold air into the living area. I know I can add some insulation in the basement to help this, but I'm wondering what I should do. Insulate the sills? Insulate the basement ceiling? If so, should I use foam board or fiberglass bats? I heard from someone that sealing up a sill plate may encourage moisture and rot problems.. is this true? I was also thinking about applying a clear caulk or silicone in between some of the problem boards of the wood floor to keep out drafts. Any advice would be much appreciated. Thanks!