Topics Covered:
Key takeaways
- Foam-filled galvanized steel garage doors averaged $1,850 installed on RJ Garage Door Service’s 2025 Raleigh invoices, about 30% less than the $2,600 average for insulated aluminum.
- Steel doors with two-inch injected polyurethane sections reach R-8 to R-9, while aluminum doors with similar foam top out near R-6.
- Aluminum cannot rust; galvanized steel resists rust until a scratch reaches bare metal, and rust can then spread under the paint within six months.
- A 16 x 7 ft steel door weighs about 165 lb against about 115 lb for aluminum, and both run on standard torsion springs with a 1/2 HP opener.
- The Aluminum Association says around 75% of all aluminum ever produced is still in use.
Galvanized steel is the cheaper, better-insulated garage door, and aluminum is the rust-proof, lighter one with more modern styling. The two materials split on dent resistance, insulation, hardware load and long-term upkeep.
The comparison below comes from RJ Garage Door Service’s installations and service calls across Raleigh, Durham, Cary and the rest of the Triangle since 2013.
How do aluminum and steel garage doors compare at a glance?
Aluminum and galvanized steel garage doors compare on ten points:
| Category | Aluminum | Steel (Galvanized) |
|---|---|---|
| Impact resistance | Dents on hard blows | High strength; dents easily |
| Panel weight (16 x 7 ft) | About 115 lb | About 165 lb |
| Typical R-value | R-6 (foam-filled) | R-8 to R-9 (foam-filled) |
| Rust potential | None | Low until paint scratches |
| Maintenance | Quarterly rinse; occasional wax | Wash + touch-up paint as needed |
| Installed price* | $2.6k (avg.) | $1.85k (avg.) |
| Noise level | Lighter; nylon rollers advised | Heavier; naturally quiet |
| Recyclability | Infinite alloy loop | Highly recyclable steel scrap |
| Hardware needs | Standard torsion + 1/2 HP opener | Standard torsion + 1/2 HP opener |
| Warranty typical | 20 yrs finish/frame | 15 yrs rust-through |
*Installed prices are RJ Garage Door Service’s average Raleigh pricing from 2025.
Which dents more easily, aluminum or steel?
Aluminum and steel both dent, and steel’s dents are harder to fix. Aluminum door skins are 0.040 to 0.060 inch thick; they shrug off everyday bumps but crease when a basketball or lawn-mower handle hits squarely. Galvanized steel panels, made from 24- or 25-gauge sheet, have higher tensile strength and flex less, yet they dent just as visibly because the metal doesn’t rebound.
A dented steel panel holds the crease permanently, while a shallow aluminum dent can sometimes be pulled flat with a suction tool.
Which resists rust and keeps its finish longer?
Aluminum resists rust better than steel because it forms a self-protecting oxide layer, so a scratch dulls the finish but never starts corrosion. Powder-coat chalking shows up on aluminum after about ten years and wipes away with automotive wax.
Steel resists rust with a zinc galvanized coat under baked paint. Once a scratch cuts through that paint, oxidation creeps underneath and can bubble the paint within a season. In humid or coastal areas, steel needs regular touch-up paint; aluminum takes corrosion off your worry list.
Which insulates better, aluminum or steel?
Steel insulates better than aluminum, reaching R-8 to R-9 with two-inch sections of injected polyurethane foam. Bare metal conducts heat, so both doors depend on their foam cores. Aluminum sections usually include thermal breaks but level off near R-6 with similar foam.
In RJ Garage Door Service’s July FLIR scans, steel door interiors ran 4 degrees F cooler than aluminum after three hours of full sun. If your garage is conditioned or used as a workshop, steel saves a few HVAC dollars a year. In an unconditioned garage, the gap won’t show up on your bill.
How does door weight affect springs and opener life?
Door weight affects springs and openers modestly here: a steel door’s extra 50 lb means slightly heavier torsion springs and more opener strain over time. Both materials run fine on a 1/2 HP belt-drive opener. Aluminum makes less noise and needs spring rebalancing less often, so if bedrooms sit over the garage, its lighter operation keeps early departures quieter.
Which material looks better on your house?
Aluminum looks better on contemporary houses, and steel looks better on traditional ones. Aluminum suits satin black flush panels, anodized bronze frames and full-view glass hybrids, and its powder coat holds color for years without chipping, so bold colors work.
Steel comes in raised-panel and carriage-style embossing, and its deeper stampings throw good shadows. Factory steel paint palettes run from crisp white to faux-wood overlays. For ultra-modern lines, pick aluminum; for classic curb appeal at a lower price, steel is still the standard.
What maintenance does each door need?
Aluminum and steel doors both need a quarterly hose rinse and a mild soap wash, and for aluminum that’s the whole routine. Steel also needs a dab of automotive touch-up paint whenever a scratch reaches bare metal, especially on the bottom two panels, where gravel spray and lawn equipment chip the finish first. Skip those touch-ups and rust can spread under the paint within six months, which eventually means replacing a panel.
Which is better for the environment?
Aluminum and steel are both widely recycled, so neither is a poor environmental choice. The Aluminum Association says around 75% of all aluminum ever produced is still in use today, and that recycled aluminum saves 95% of the energy needed to make new aluminum.
New aluminum takes more electricity per ton to produce than steel, but its lighter weight cuts shipping emissions for finished doors.
How much do aluminum and steel doors cost, and which pays back at resale?
An insulated aluminum garage door costs about $2,600 installed and a foam-filled steel door of the same size about $1,850, based on RJ Garage Door Service’s 2025 Raleigh invoices. Steel saves roughly 30%.
For resale, the 2025 Cost vs. Value Report from Zonda Media, as reported by DASMA, ranked garage door replacement first of 28 projects, with a national average cost of $4,672, an estimated resale value of $12,507 and a 268% return. That report doesn’t compare door materials. In upscale contemporary builds, appraisers sometimes give extra credit for aluminum’s clean lines; in traditional subdivisions, buyers take a steel door as no step down in quality.
Should you choose aluminum or steel?
Choose aluminum if you want rust immunity, lighter hardware loads and modern colors, and you don’t mind paying a bit more up front.
Choose steel if you want the best insulation, classic embossing and the most durability for the price, and you’re willing to keep touch-up paint handy for scratches. Whichever you pick, RJ Garage Door Service will size the springs, calibrate the opener force and seal the perimeter gaps so the door runs smoothly for years. Call (919) 438-7447 for a free estimate.
