I am pondering building a new home this year and have the most basic of questions to ask regarding insulation. It seems that most builders use traditional batt insulation in the walls and blown insulation in the attic. I have heard that foam insulation sprayed into the walls is far superior to batt insulation; is this correct? If so what are the cost differences per square foot between foam and batt insulation? I am considering building an ~ 2,200 sq. ft colonial and definitely want and need good windows and insulation to start with. Any advice or thoughts?? Any help is greatly appreciated.