Spray Foam vs. Fiberglass: Which Is Right for Your Home?

Introduction

When it comes to insulating your California home, the choice between spray foam and fiberglass insulation is crucial. Both have their merits, but understanding the differences can help you make the best decision for your specific needs.

Understanding R-Values

The R-value measures an insulation's resistance to heat flow. Higher R-values mean better insulating power.

Spray Foam (Closed Cell): R-6.5 per inch

Spray Foam (Open Cell): R-3.7 per inch

Fiberglass Batts: R-2.9 to R-3.8 per inch

Air Sealing Capabilities

One of spray foam's biggest advantages is its ability to create an airtight seal. Unlike fiberglass, which can leave gaps and requires separate air sealing, spray foam expands to fill every crack and crevice.

Cost Comparison

While spray foam has a higher upfront cost, the long-term energy savings often offset the initial investment. Many California homeowners report 30-50% reductions in energy bills after switching to spray foam.

Moisture and Mold Resistance

Closed-cell spray foam acts as a moisture barrier, making it ideal for California's coastal areas where humidity can be a concern. Fiberglass can absorb moisture, potentially leading to mold growth.

Longevity

Spray foam maintains its R-value for the lifetime of your home, while fiberglass can settle and degrade over time, losing up to 20% of its effectiveness.

Our Recommendation

For most California homes, we recommend closed-cell spray foam for exterior walls and attics, and open-cell foam for interior walls where soundproofing is desired. Contact us for a free assessment of your specific situation.