Comparing Attic Insulation Types
Choosing the best attic insulation depends on your priorities — budget, performance, longevity, and specific home conditions all play a role. Spray foam insulation (both open-cell and closed-cell) offers the highest performance with superior air sealing. Fiberglass batts are the most affordable but offer lower performance. Cellulose provides good value with decent performance, while mineral wool excels in fire resistance and soundproofing.
For most homeowners in the Franklin, TN area, closed-cell spray foam provides the best overall value when considering long-term energy savings, durability, and performance. However, each home is unique, and the best choice may vary based on your specific attic configuration and goals.
Spray Foam: The Premium Choice
Spray foam insulation comes in two varieties: open-cell and closed-cell. Open-cell spray foam has an R-value of about R-3.7 per inch and is less expensive, making it suitable for interior applications where moisture isn't a primary concern. Closed-cell spray foam delivers R-6 to R-7 per inch and provides a vapor barrier, making it ideal for attics exposed to weather extremes.
Both types create an air barrier that other insulation types cannot match. This air sealing capability is particularly important in attics, where air leaks around recessed lights, plumbing penetrations, and electrical wires can significantly reduce insulation effectiveness. BST Spray Foam of Franklin specializes in both types and can recommend the best option for your attic.
Making the Right Decision
When selecting attic insulation, consider the full picture: upfront cost, energy savings, lifespan, and maintenance requirements. Fiberglass batts may cost half as much as spray foam initially, but they typically need replacement every 15-20 years and don't provide air sealing. Spray foam can last 80+ years and pays for the cost difference through energy savings.
Also consider your home's specific needs. If you have a very leaky attic with many penetrations, spray foam's air sealing makes it the clear winner. If you have a well-sealed attic and are primarily adding R-value, blown-in cellulose or fiberglass might be cost-effective. Schedule a free consultation with BST Spray Foam of Franklin to get personalized recommendations.