Is $3,500 to spray foam attic with open-cell insulation a fair price?
Project Details
I have a 4-sided brick 1950s ranch house in Georgia. My house is ~1,700 SF total, but the attic is only above ~1,300 SF. The other 400 SF was an addition with a rubber roof directly on top, with no attic space. The air handler and ductwork is in the attic. I currently have blown-in insulation, so the attic is very hot during the summer. Our HVAC is running for probably 16 hours a day on average during the summer months. My crawlspace is also encapsulated. My goals here are to 1) reduce my energy bill, and 2) increase the longevity of my HVAC system, at a reasonable cost. I'm contemplating doing open cell spray foam, which is permeable to water. So if there is a roof leak, I'll it'll make its way through to the attic and I'll know (vs closed-cell which can get trapped and cause rot). I'm not looking to spray foam my walls, just the roof line.
Quote Details
This option includes the removal of existing blown-in insulation and the application of open-cell spray foam insulation to the attic roof line. This type of foam is considered standard in the South due to its performance in hot-humid climates. It offers several benefits over closed-cell foam, including: - Safer Moisture Behavior: Allows the roof deck to dry inward and reveals roof leaks. - Avoids Structural Stress: Flexible and low-density, it does not shrink or pull on roof decking. - Better for Retrofit Fit & Air Sealing: Expands significantly (approx. 100x) to fill gaps completely. - Easier to Modify Later: Soft and easy to remove for future work. - More Cost-Effective: Achieves excellent thermal and air-sealing performance for significantly less money.
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More Details
Category
Insulation
Price
$3,500
Quote Date
July 22, 2025
Location
Georgia
Home Size
1,700 sq ft
Year Built
1950
Insulation Type
Spray foam
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