Spray foam insulation delivers higher thermal resistance, better air sealing, and improved moisture control compared to traditional insulation materials like fiberglass and cellulose. In New Lenox, IL’s mixed climate with humid summers and cold winters, these performance advantages significantly impact long-term energy savings and indoor comfort.
This article outlines the technical and practical differences between insulation types, focusing on the functional reasons spray foam often outperforms conventional options. All comparisons are based on verified field experience and installation outcomes in residential insulation and commercial structures across northern Illinois. South Chicago Insulation applies this firsthand data in assessing insulation performance and advising clients across the region.
| Feature | Spray Foam (Closed-Cell) | Fiberglass Batts | Blown-In Cellulose |
|---|---|---|---|
| R-Value per Inch | 6.0 – 7.0 | 2.9 – 3.8 | 3.2 – 3.8 |
| Air Sealing | Excellent | Poor | Moderate |
| Moisture Resistance | High | Low | Low to Moderate |
| Mold Resistance | High | Low | Moderate |
| Longevity | 30+ years | 10-25 years | 15-30 years |
| Installation Complexity | High (Requires professional) | Low | Moderate |
| Cost per Square Foot (IL Avg) | $1.75 – $3.50 | $0.50 – $1.00 | $0.60 – $1.20 |
Closed-cell spray foam insulation handles New Lenox’s fluctuating humidity and sub-freezing winter temperatures more effectively than traditional options. The dense foam structure resists moisture ingress during humid months and prevents convective heat loss during freezing temperatures.
| Attribute | Closed-Cell Spray Foam | Value |
|---|---|---|
| R-Value per inch | ASTM C518 | 6.5 average |
| Water Vapor Permeance | ASTM E96 | < 1.0 perm (acts as vapor barrier) |
| Air Permeability | ASTM E283 | < 0.02 L/s/m² @ 75 Pa |
| Compressive Strength | ASTM D1621 | 25 – 30 psi |
| Flame Spread Index | ASTM E84 | < 25 |
| Thermal Drift over 10 Years | Field Observation | < 5% R-value degradation |
Bonus Tip: Always test substrate temperature and humidity before installation. Applying foam to a cold or wet surface in winter can lead to poor adhesion and curing issues.
Yes, once cured, closed-cell spray foam is inert. Proper ventilation during installation is essential.
No. Professional installation ensures proper expansion, safety, and compliance with building codes.
Closed-cell foam often acts as its own vapor barrier. Always verify based on local humidity levels and code.
Spray foam insulation has a functional life of 30+ years without settling or sagging.
Yes. Closed-cell spray foam provides insulation and moisture control for encapsulated crawlspaces.
Bonus Tip: Use closed-cell foam in rim joist areas where condensation and thermal bridging commonly occur. These zones are often overlooked and account for significant energy loss.
Need help deciding whether spray foam is right for your property in New Lenox? South Chicago Insulation provides accurate evaluations and honest recommendations based on local conditions and field-tested results.
Phone: (779) 803-8025 Email: [email protected]
No ongoing maintenance is needed. Periodic checks for structural issues or water intrusion are recommended.
Closed-cell spray foam retains shape and structure. Shrinkage is rare if installation temperatures are correct.
Spray foam isn’t a food source and is less likely to be disturbed than fiberglass, but sealing entry points remains important.
Yes. Hybrid assemblies often use foam for air sealing and fiberglass or cellulose for added thermal value.
Most homes in Illinois see energy cost payback in 3 to 5 years, depending on usage and HVAC upgrades.