Steel Doors
The construction-type table: single, double and sandwich layers.
Learn more →Why Insulation Earns Its Keep at This Latitude
- The thermal math: your garage door is the largest, thinnest surface in the garage envelope. An uninsulated steel skin reaches skillet temperatures in afternoon sun and radiates into the space all evening. Insulated panels break that chain.
- Attached-garage physics: the wall and ceiling between garage and house fight the garage's temperature all summer. Every degree the garage doesn't gain is load your AC doesn't carry — and the bedroom over the garage notices first.
- What lives in your garage: vehicles, tools, paint, electronics, water heaters, the second fridge — everything ages faster at 120°. So do opener circuit boards.
- Quiet and stiffness: foam-core panels resist dents, rattle less, and survive opener cycling better on wide doors.
Reading a Spec Sheet Like an Installer
- Construction first: "insulated" should mean sandwich construction (steel-foam-steel), not a foam sheet taped behind a single skin.
- Core type: polyurethane outperforms polystyrene per inch and bonds the panel into one stiff unit.
- Thermal breaks & seals: between-section seals, jamb weatherstripping and a good bottom seal decide whether the R-value on paper survives contact with reality.
- Skin gauge still matters: a quality insulated door pairs its core with respectable steel — see our gauge guide.
Retrofit honesty
Stick-on insulation kits for existing doors add some comfort, and we won't pretend otherwise — but they add weight the springs weren't sized for. If you've added insulation panels to your door, have the spring balance checked; an out-of-balance door quietly destroys openers. And when the door's due for replacement anyway, a factory sandwich door beats any retrofit by a mile.
Common questions
Frequently Asked Questions
Polystyrene or polyurethane — what's the difference?
Polystyrene is rigid foam board fitted between the skins — good, economical insulation. Polyurethane is foamed in place, bonding to both skins — roughly double the insulating value per inch, and it turns the panel into a stiff, quiet composite. Our shorthand: polystyrene for solid value, polyurethane when comfort, quiet or a bedroom over the garage is in play.
What R-value do I actually need?
Honest answer: the marketing war over R-18 vs R-16 matters less than getting from R-0 to something real. For a Las Vegas attached garage used for parking and storage, mid-single-digit to low-double-digit R-value transforms comfort; for workshops, gyms or rooms above, buy toward the top of the range and mind the perimeter seals too. Note that a door's advertised R-value describes the panel center, not the assembled door — every brand plays this game, so compare construction, not just the number.
Will an insulated door lower my energy bill?
If the garage is attached — sharing walls or ceiling with conditioned rooms — yes, by moderating the thermal buffer zone your AC fights against; bedrooms over garages feel it most. On a detached, unconditioned garage the payoff is comfort and equipment protection more than utility savings. We'd rather tell you that plainly than promise magic percentages.
Are insulated doors quieter?
Noticeably. The foam core damps panel vibration (that hollow single-skin boom disappears), and sandwich doors run stiffer and truer in the tracks. Pair one with sealed nylon rollers and a belt-drive opener and the door becomes something you simply don't hear from inside.
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Related Services
Quiet-Door Guide
Insulation is one leg of the quiet trifecta.
Learn more →Residential Doors
The full buying walkthrough.
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