Most of the work is done on the first floor, which is about 20' x 32'. I built it using styrofoam mixed concrete blocks, which are strong enough and good insulators. I need insulation because the only heat is the kiln and a good wood stove. It's on the edge of the woods and next to an old granite quarry. The Rockport quarries all stopped about 1930 and are now beautiful, full of water, and surrounded by woods.