Polyurethane vs. Polystyrene Insulation
When insulating a garage door, you generally choose polystyrene or polyurethane. The differences show up in cost, real-world R-value, moisture resistance, noise, and how long the door lasts in Florida’s heat and humidity.
Polystyrene
Polystyrene is a formed foam insert (similar to the material in a foam cup) shaped to fit panel cavities. It is often the less expensive option, but it may leave pockets where insulation does not fully fill the panel. Moisture can collect in those voids over time. Polystyrene doors typically deliver a lower true R-value and shorter lifespan than polyurethane-cored doors.
Polyurethane
Polyurethane insulation is sprayed as a liquid that expands and hardens to fill every corner of the panel. That complete fill produces a higher R-value, resists moisture intrusion, and helps the door operate more quietly with less vibration. Clopay Intellicore doors use this approach for premium energy performance.
How much more does polyurethane cost?
A fair market difference is typically about 10–12%. Be cautious of quotes that price polystyrene doors the same as polyurethane—compare construction details, not just the headline price. We are happy to review any quote and help you choose the right door for your home.