Spray foam is one of the most talked-about insulation materials in Delray Beach, and for good reason — it offers high R-value per inch and air-seals as it expands. But it's also significantly more expensive than blown-in fiberglass, and in Florida's heat and humidity, it can trap moisture against the roof deck if applied incorrectly. This guide helps Palm Beach County homeowners understand when spray foam makes sense, when blown-in fiberglass is the better choice, and how to decide for your Delray Beach home.
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Spray foam offers roughly R-6 to R-7 per inch (closed-cell) or R-3.7 per inch (open-cell), compared to blown-in fiberglass at R-2.2 to R-2.5 per inch. That means spray foam achieves target R-value in less depth — but at 3–5x the cost of blown-in fiberglass for the same attic. For most Delray Beach homes, the cost premium isn't justified by the performance difference.
Blown-in fiberglass is the better choice for the vast majority of Palm Beach County attics because it delivers proven R-value at a fraction of the cost, doesn't trap moisture, and can be removed or topped up easily. Spray foam is best reserved for specific applications — like rim joists or crawl spaces — where its air-sealing and moisture properties add unique value.
In Florida's relentless humidity, spray foam applied to the underside of the roof deck can trap moisture against the sheathing if the building envelope isn't perfectly air-sealed. This can lead to roof deck rot — a costly problem that's nearly impossible to detect until it's severe. Blown-in fiberglass on the attic floor avoids this risk entirely.
For Delray Beach homeowners, the safer and more cost-effective approach is blown-in fiberglass on the attic floor (to R-49+), combined with proper air sealing and balanced ventilation. This delivers the energy savings without the moisture risk or the 3–5x cost premium of spray foam.
A typical Delray Beach attic insulated with blown-in fiberglass to R-49 runs $2,200–$7,800. The same attic with closed-cell spray foam can run $8,000–$20,000 or more. The energy savings difference between the two is minimal — both cut cooling bills 15–30% — but the payback period for spray foam is 10–15 years vs 3–5 years for blown-in fiberglass.
For most Palm Beach County homeowners, blown-in fiberglass is the clear winner on cost, payback, and risk. Use our instant quote tool to see your projected Delray Beach cost and savings.
It depends on your goals. Spray foam offers higher R-value per inch but costs 3–5x more and can trap moisture in Florida's humidity. For most Delray Beach attics, blown-in fiberglass delivers the same energy savings at a fraction of the cost with no moisture risk.
Closed-cell spray foam in Delray Beach typically runs $8,000–$20,000+ for a full attic, compared to $2,200–$7,800 for blown-in fiberglass to the same R-value. The payback period for spray foam is 10–15 years vs 3–5 years for blown-in.
Yes, if applied to the roof deck underside without perfect air sealing, spray foam can trap moisture against the sheathing, leading to rot. Blown-in fiberglass on the attic floor avoids this risk entirely and is the safer choice for Delray Beach homes.
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