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On occasion a home's crawlspace might require added insulation as well as a vapor barrier. This added insulation helps to regulate the homes temperature, which in turn saves money on energy bills. Typically, a home with block walls will require insulation because that style walling allows a large amount of airflow to invade the home due to the high number of joints and cracks in that type of walling. Combining the insulation with a vapor prevents the skewing of your home's temperature and humidity.