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The right insulation is important in keeping your home warm in the winter and cool in the summer.  It creates a barrier to prevent the inside air from escaping and the outdoor air from entering the house; maintaining a comfortable environment for the inhabitants.  Spray foam insulation is the most widely used type today.  It has a higher R-value and does not settle, shrink, or sag like fiberglass insulation.  After spray foam insulation is applied, it expands 100 times its original volume to provide an air tight seal yet it can expand and contract with the house.  Spray foam insulation is not cheap, but it will save money over time by reducing heating and cooling bills.