The spray foam insulation is often a neglected part of a home, but adding insulation to the space can make your house easier and cheaper to heat in winter and cool in summer. Combined with attic air sealing, it can also help reduce the formation of dangerous ice dams in winter. Choosing the right type and R-value of attic insulation depends on your climate.

The R-value of insulation is a measure of how well it prevents the flow of heat, and different types and thicknesses offer varying levels of performance. The US Department of Energy recommends an R-value of at least R-30 for most regions, but it is possible to achieve higher R-values in colder regions. Spray foam insulation, for example, has a high R-value and creates an airtight seal, making it ideal for colder regions.

Is Spray Foam Insulation Right for Your Attic? Here’s What You Need to Know

Blanket or batt insulation is a common DIY option for attic insulation, but it’s not a good fit for every project. It comes in sheets that can be affixed to unfinished parts of the attic, and it can be made from fiberglass, mineral wool or natural materials like cellulose. It is moisture-resistant, but it tends to settle and lose R-value over time. It can also be a favorite snack of raccoons, which can degrade it.

Blown-in or loose-fill insulation is a popular choice for professionals and DIYers alike. It is made of small particles that can be blown into attics, and it can be made from fiberglass, cellulose or mineral wool. It can be more effective in colder climates than blanket insulation, but it may not provide the same level of R-value in hotter climates. It can also be prone to dust accumulation, and it requires an air gap for proper function.

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