There are four main types of attic insulation available to Indianapolis homeowners — blown-in fiberglass, cellulose, spray foam, and batt insulation — plus radiant barriers as a supplement. Each has different costs, R-values, lifespans, and performance characteristics in Indiana's climate. This guide compares them all and explains why we recommend blown-in fiberglass for the vast majority of Marion County homes.
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Blown-in fiberglass is our recommended material for Indianapolis attics. It's installed with a blowing machine that fills every gap and void, delivering uniform R-value across the attic floor. It retains its rated R-value for 30+ years without settling, doesn't absorb moisture, won't feed mold, and is fire-resistant without chemical additives.
Cost: $2,200–$7,800 for a typical Marion County home. R-value: R-2.2–R-2.5 per inch, installed to R-49+. Lifespan: 30+ years. This is the material we install in every Indianapolis home.
Cellulose: cheaper per bag but settles 20–30% over time, losing effective R-value. Absorbs moisture. Lifespan 15–25 years. Spray foam: highest R-value per inch but 3–5x the cost, can trap moisture against the roof deck in Indiana's humidity. Lifespan 20–30 years. Batt insulation: pre-cut sizes that leave gaps around wiring and ductwork, reducing effective R-value. Lifespan 15–25 years.
For Indianapolis homeowners, none of these alternatives deliver the combination of cost-effectiveness, longevity, and climate-appropriate performance that blown-in fiberglass offers.
For 90% of Marion County homes, blown-in fiberglass to R-49+ is the right choice — it delivers proven performance, decades of R-value retention, and the best cost-to-savings ratio. The exceptions are homes with specific needs (rim joists, crawl spaces) where spray foam's air-sealing adds unique value.
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For most Indianapolis homes, blown-in fiberglass is the best choice. It delivers uniform R-value, retains performance for 30+ years without settling, doesn't absorb moisture in Indiana's humidity, and offers the best cost-to-savings ratio of any insulation type.
Blown-in fiberglass: R-2.2/inch, 30+ year lifespan, $2,200–$7,800. Cellulose: settles 20–30%, 15–25 year lifespan. Spray foam: R-6/inch, 3–5x cost, moisture risk. Batts: gaps reduce R-value, 15–25 year lifespan. Fiberglass wins for most Marion County homes.
Yes. It's common to add blown-in fiberglass on top of existing batt insulation — R-value is additive. We assess your existing material and recommend the right approach for your Indianapolis home during the free attic inspection.
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