The Real Cause
When attic temperatures hit 130–150°F in a Chattanooga summer, that heat radiates straight down through the ceiling. Old fiberglass batts, gaps around can lights, and uninsulated attic hatches let it through.
The Fix
Air seal the ceiling plane first, then bring insulation to R-49 or higher with blown-in or spray foam. Spray foam at the roof deck creates a conditioned attic and stops heat at the source.
- Air seal top plates, can lights, plumbing chases
- Insulate to R-49+
- Consider spray foam at the roof deck
- Add or upgrade attic ventilation if vented
What It Costs in Chattanooga
A typical attic upgrade in Chattanooga runs $2,500–$7,500 depending on size and insulation type. Most homeowners see HVAC bills drop 15–30% the first month.