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Building science and design principles that your builder/architect subscribes to can often dictate the method of spray foam used in the attic. Insulation is used on the attic floor to insulate the ceiling from the seasonal cold and/or heat in a traditional vented attic setting. Between the floor joists, where cellulose and fiberglass insulation is traditionally used, spray foam is also applied. However, no insulation is applied to the rest of the attic. The attic, via soffit, ridge, and gable vents, remains highly vented. Although it is not the most effective system, it is the most common engineered system used throughout the U.S.