Why Material Choice Matters More in Coastal Florida
A garage door that thrives in Phoenix will rust out in Miami Beach within five years. Salt spray, year-round humidity above 70%, and HVHZ wind-load requirements (High-Velocity Hurricane Zones) narrow your options fast.
Hurricane Andrew proved that garage doors are the weakest point in most homes. When a door fails, wind pressurizes the interior and blows the roof off. That's why Miami-Dade and Broward require impact-rated doors in certain zones—and why material selection isn't just about curb appeal.
Steel dominates the market nationally at 65% share. Aluminum and wood each hold about 10%. But those national numbers don't reflect coastal realities. Let's break down what actually works here.
Steel Garage Doors: The Workhorse With Rust Risks
Steel doors come in 24-gauge (thin, budget) to 16-gauge (thick, commercial). Most residential installs use 25-gauge with polyurethane insulation sandwiched between two steel skins. R-values hit 18–20, the highest of any material.
Pros: Steel dents less than aluminum. It's the cheapest insulated option. Factory finishes now include baked-on polyester that resists fading better than old acrylic paints. You'll find the widest selection of panel styles—raised, recessed, carriage-house stamps.
Cons: Steel rusts. Period. Even galvanized, powder-coated steel will corrode along bottom edges and hinge points if you're within two miles of the ocean. The salt doesn't need to touch the door—it's in the air. Scratches and dings expose bare metal, and rust blooms fast in 80°F humidity. Budget an extra $200–400 every five years for repainting or panel replacement if you're coastal.
If you're inland—Coral Gables, Pinecrest, west Kendall—steel performs fine. Just hose it down quarterly to wash off any salt drift and inspect the weatherseal. A quality steel door should last 15–20 years with basic care.
Aluminum Garage Doors: Lightweight and Rust-Proof
Aluminum doors use extruded frames with infill panels—either more aluminum, frosted acrylic, or glass. They're 40% lighter than steel, which means less strain on the opener and springs. Torsion springs on aluminum doors often outlast their rated 10,000 cycles because there's less load.
Pros: Aluminum doesn't rust. It oxidizes into a stable white powder that actually protects the underlying metal. This makes it the go-to for beachfront properties. The modern aesthetic—powder-coated black or bronze frames with frosted panels—fits contemporary architecture better than faux-wood steel stamping. If you want natural light in the garage, aluminum with glass is your only real option.
Cons: Aluminum dents. A soccer ball, shopping cart, or hail will leave permanent dimples in thin panels. It's also a terrible insulator—R-value near zero unless you add foam-core panels, which kills the translucent look. Expect your garage to match outdoor temps. Finally, aluminum costs 20–40% more than equivalent steel, and the selection is narrower. You won't find many carriage-house styles.
One warning: cheap aluminum doors use thin extrusions that flex under wind load. If you're in an HVHZ zone, verify the door is Miami-Dade NOA-approved (Notice of Acceptance). Not all aluminum doors meet the 180mph rating.
Wood Garage Doors: Beauty That Demands Maintenance
Real wood doors—cedar, redwood, mahogany—deliver curb appeal no steel stamp can match. They're custom-built, heavy (often requiring a 3/4 HP opener), and expensive. Expect $3,500–8,000 installed for a standard two-car door.
Pros: Unique. No two wood doors look identical. You can stain, paint, or let them weather to silver-gray. They're repairable—a damaged panel can be planed, filled, and refinished without replacing the whole section. In historic districts or high-end neighborhoods, wood is sometimes the only aesthetic fit.
Cons: Wood rots in Florida. Humidity, termites, and carpenter bees love untreated wood. Even treated cedar needs a fresh coat of marine-grade sealant every 12–18 months. Miss a year and you'll see warping, splitting, and mildew. The labor cost for refinishing runs $600–1,000 each time.
Wood also expands and contracts with humidity swings. That 95% August afternoon followed by a 60% winter morning? Your door will stick, scrape, and throw the photo-eye alignment off. You'll adjust the track limits twice a year.
If you love wood but hate maintenance, consider composite. It's MDF with a polymer skin that looks like wood but won't rot. Still expensive, still heavy, but you skip the sealant cycle.
Hurricane Code and Wind-Load Requirements
Miami-Dade and Broward enforce the Florida Building Code's HVHZ provisions. If you're within one mile of the coast or in a wind-borne debris region, your new door must meet one of two standards:
- Impact-rated: Survives a 9-pound 2×4 shot at 50 feet per second. These doors use reinforced panels, heavy-gauge steel frames, and laminated windows. They're tested and stamped with a NOA number.
- Non-impact with storm shutters: Cheaper door plus roll-down shutters or panels you install before a storm. Most people skip this—it's a hassle and shutters cost $1,200–2,500 anyway.
Steel and aluminum both have impact-rated options. Wood doors rarely do—they can't pass the projectile test without steel reinforcement, at which point you're paying custom prices for a hybrid.
When you're shopping for new installation in Miami, ask for the NOA number and verify it on the Miami-Dade Product Control database. A door that's not listed there will fail your final building inspection.
Cost Breakdown and Lifespan Expectations
Here's what you'll actually pay installed for a standard 16×7 insulated door with an opener in Miami-Dade, plus realistic lifespan based on coastal vs inland location:
- Steel (25-gauge, R-16): $1,400–2,200. Lasts 15–20 years inland, 10–12 years coastal with maintenance.
- Aluminum (powder-coated, frosted panels): $2,000–3,500. Lasts 20–25 years anywhere—rust isn't an issue.
- Wood (cedar, custom): $3,500–8,000. Lasts 15–20 years if you stay on top of sealing; less than 10 if you don't.
- Composite (wood-look): $2,800–5,000. Lasts 20+ years with minimal care.
Don't forget the opener. A 1/2 HP belt-drive LiftMaster with battery backup and MyQ runs $400–600. If you're going wood, bump to 3/4 HP for $150 more.
One hidden cost: spring replacement. Torsion springs are rated for 10,000 cycles—about 7–10 years of normal use. Lighter aluminum doors stress the spring less, so you might stretch to 12 years. Replacement costs $200–300 for a pair.
Which Material Should You Choose?
If you're inland and budget-conscious, steel wins. Go with 25-gauge minimum, baked polyester finish, and R-16 insulation. Hose it down quarterly and you'll get 15+ years.
If you're within two miles of the ocean, aluminum is worth the premium. The rust-proof benefit pays for itself in avoided repaints and panel swaps. Just accept that dents are part of the deal.
If you're in a historic or luxury neighborhood and willing to maintain it, wood or composite delivers unmatched curb appeal. Budget $800–1,000 every other year for refinishing, or go composite to skip that cycle.
If you're in an HVHZ zone, verify impact rating regardless of material. A non-rated door will fail inspection and could void your insurance if a storm hits. Check the NOA database before you sign any contract.
One last tip: if you're replacing an existing door, measure the header clearance and side room. Some aluminum doors need an extra inch of side clearance for the thicker frame. Steel is more forgiving. A pro installer will catch this during the site visit—another reason not to DIY a garage door swap.