Sheets of foam board can be cut to fit tightly between wall studs or attic ceiling joists. Because they are not as effective at insulating, foam boards are not as popular as blanket insulation. Blown-in insulation refers to blowing or spraying insulation products into wall cavities, attics, and floors. Two of the most common types of blow-in insulation are fiberglass, rock wool, and cellulose, which are applied in an attic space with a blowing machine for easy, even distribution. While this insulation is also one of the most inexpensive and easiest types to install, it isn’t as effective as spray foam insulation.
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