Properly spray foaming your roof-line to create a dehumidified cool attic environment is by far one of the most effective and quickest payback on initial investment upgrades one can perform on their home if the central air conditioning system is in the attic. Properly spray foaming the roof-line in an attic containing duct-work evens out temperature differences in different rooms of the house that may be experiencing challenges heating and cooling, lowers the relative humidity level of the home by reducing depressurization, and protects the storage of items in the attic by fostering a comfortable environment.