Can I put spray foam over fiberglass?

Name: Scenic City Insulation
Address: Chattanooga, TN, US
Telephone: (423) 464-7464
Price range: $$

We remove old fiberglass first — it traps moisture and reduces foam adhesion.

Fiberglass vs Spray Foam Insulation

Fiberglass is cheap and easy. Spray foam costs more upfront and outperforms it on nearly every metric that matters.

The Big Difference

Fiberglass slows heat transfer but does not air seal. Spray foam does both. In a humid Chattanooga climate, the air sealing matters more than the R-value.

Cost vs Performance

Fiberglass runs $0.50–$1.50/sq ft. Spray foam runs $1.00–$4.50/bd ft. Spray foam pays back in 3–5 years through utility savings.

Frequently asked questions

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