I live in a 200 year-old farmhouse in Central Maine with a full basement made of granite blocks with a dirt floor. As winter is coming soon, I remember banking the asement of my childhood home with plastic and am wondering if this is a good or even applicable practice on my current home. There is no insulation currently between the basement and the main floor (slippers please!) and no insulation attached to the interior granite surfaces of the basement. Any commentary on this situation would be greatly appreciated!