Spray Foam Insulation
Spray foam insulation is usually made of polyurethane that’s applied as foam and expands and hardens as a solid. It creates airtight seals in wall gaps, particularly in the attics. Since spray foam insulation expands, it automatically conforms to the precise shape and dimensions of the area in which it’s being installed.
Spray foam insulation can last for up to 80 years depending on the material being used. Since this type of insulation creates a strong seal, it’s one of the most effective solutions to blocking drafts and minimizing thermal heat transfer in attic spaces.
Blown-in Insulation
In contrast, blown-in insulation is a material made of fiberglass or cellulose. It is blown into cavities in walls to fill in the gaps in insulation. This method is perfect for attic spaces with nooks and crannies that are difficult to insulate due to their sizing and shape.
Cellulose blown-in insulation is the most affordable option because it is made from recycled materials. Once it is installed, this insulation can last for up to 25 years.