Definition
Foam insulation that is injected into a door section as a liquid and expands to fill every cavity, bonding to both steel skins as it cures. The result is the highest R-value per inch of any common door insulation — typically R-12 to R-18 — plus noticeably more rigidity and sound dampening. It is the premium choice for attached garages and anyone who works or exercises in the garage through Four-State winters. Polyurethane doors cost more than polystyrene, but the structural payoff is real.
Why this term matters for homeowners
In the Four-State Area, garage door terms usually connect to insulation R-value, steel gauge, wind load, and whether repair or replacement is the smarter long-term spend.
- Use this term to ask better follow-up questions during estimates.
- Look for this language in Learn and Evaluate guides to connect definition to decisions.
- Confirm how this applies to your specific door size, age, and daily use.
Related pages
Category: Garage Doors