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All buildings, whether they are residential homes or businesses, must be insulated against air and moisture. In the winter, when the temperature is cold, you turn your heat on. The warm air from inside flows out of buildings through cracks and seams. In the summer, when the temperature is warm, you turn your air conditioner on. The warm air from outside flows into the buildings through the same cracks and seams. If you seal up the cracks and seams with insulation, air cannot flow out of or into the building. This keeps warm air from escaping in the winter and warm air from entering in the summer. Foam roof insulation is being installed by homeowners and businessmen. Many homeowners and businessmen are realizing the benefits of roof insulation. They are discovering that roof insulation is effective in sealing up the cracks and seams, which in turn keeps their heating and cooling bills to a minimum.