If your home feels drafty in the winter or struggles to stay cool in the summer, your insulation may not be doing its job. Choosing the right insulation is key to lowering energy costs, improving indoor comfort, and preventing issues like moisture buildup and ice dams. But with so many options, how do you decide? This guide compares two of the most popular choices—spray foam and cellulose insulation—so you can make an informed decision for your home.
At ARC Insulation, we’ve been helping Chicagoland homeowners improve energy efficiency and home comfort for over 30 years. We install both spray foam and cellulose insulation and always take a building science approach to recommend the best solution for your needs.
Spray Foam vs. Cellulose: A Side-by-Side Comparison
| Factor | Spray Foam Insulation | Cellulose Insulation |
| R-Value (Insulating Power) | High R-value per inch (≈ R-6 per inch for closed-cell) | Moderate R-value (≈ R-3.8 per inch) |
| Air Sealing | Creates an airtight seal, reducing drafts | Requires additional air sealing for best performance |
| Moisture Resistance | Blocks moisture and prevents mold growth | Absorbs moisture and may settle over time |
| Lifespan & Durability | 50+ years | 20-30 years |
| Soundproofing | Moderate | Excellent |
| Eco-Friendliness | Higher carbon footprint but long lifespan | Made from recycled materials |
| Best For… | Basements, open walls, and homes needing maximum energy efficiency, moisture control, and structural strength | Attic, existing walls, and budget-conscious homeowners looking for an eco-friendly, soundproofing option |
Spray Foam Insulation: High-Performance Efficiency
Spray foam insulation is a polyurethane foam that expands up to 60 times its original size when applied, filling gaps and creating an air-tight barrier. It’s one of the most energy-efficient insulation options available.
Pros:
✅ Creates an airtight seal, reducing drafts and improving energy efficiency
✅ Long-lasting and durable (50+ years)
✅ Strengthens home structure
✅ Provides moisture protection, reducing mold risk
✅ Acts as an air, vapor, and radiant barrier for all-season performance
Cons:
❌ Requires a fire-resistant barrier for safety
❌ Higher upfront cost compared to cellulose
❌ Not as sound-resistant as cellulose
❌ Requires more access behind walls, which may involve drywall removal
Cellulose Insulation: Cost-Effective & Eco-Friendly
Cellulose insulation is made from shredded recycled newsprint and treated with boric acid to enhance fire, mold, and pest resistance. It’s blown in to provide effective coverage and is an environmentally friendly choice.
Pros:
✅ Environmentally friendly, made from recycled materials
✅ Provides excellent soundproofing
✅ Naturally fire, insect, and mold resistant
✅ Cost-effective insulation solution
Cons:
❌ Shorter lifespan than spray foam (20-30 years)
❌ Can settle over time, reducing effectiveness
❌ May require additional air sealing for peak performance
Best Uses for Each Insulation Type
Best Uses for Spray Foam Insulation
✔️ Attics with sloped or cathedral ceilings
✔️ Basements and crawl spaces where moisture control is needed
✔️ Behind walls in homes needing maximum energy efficiency
✔️ New construction or major renovations where access is easy
Best Uses for Cellulose Insulation
✔️ Open attics needing blown-in coverage
✔️ Interior walls where soundproofing is a priority
✔️ Budget-conscious insulation upgrades
✔️ Older homes where minimal disruption is preferred
Rebates & Incentives for Insulation Upgrades
Upgrading your home’s insulation doesn’t just improve comfort—it can also qualify you for valuable rebates and tax credits. Both spray foam and cellulose insulation are eligible for incentives, including:
- Inflation Reduction Act (IRA) tax credits – Up to 30% off insulation upgrades
- Illinois utility rebates – Potential discounts through local energy providers
Want to learn how much you can save? ARC Insulation will help you navigate available rebates and maximize your savings.
Find the Best Insulation for Your Home with ARC Insulation
Since 1993, we’ve helped thousands of Chicagoland homeowners improve home comfort, reduce energy costs, and eliminate common insulation problems like ice dams and drafts. Our expert team ensures a thorough, clean, and professional installation every time.
Schedule a free insulation assessment today!
