Aluminum Hurricane Shutters: Gauge, Corrosion, and vs Steel

Hurricane shutters come in more styles than most homeowners expect, but the material behind them matters as much as the style. Aluminum hurricane shutters dominate coastal markets because aluminum is light, resists rust and is strong enough to meet impact standards when it is thick enough. The catch is that not all aluminum panels are equal: thickness, alloy, finish and fastening hardware decide whether a shutter survives a storm and decades of salt air.

The quick answer: for most homes, aluminum is the best all-around choice. Choose .063 inch gauge for large openings and high wind zones, and .050 inch for smaller windows where panels are well supported. Steel panels cost less and resist dents better, but they are heavy and can rust near the coast. Clear polycarbonate panels let light in and weigh even less, though they cost more and can scratch or haze over time.

Whichever material you choose, the shutter must carry a product approval for your local wind zone and be installed with the specified anchors. Material choice comes second to a tested, approved system.

Why Aluminum Hurricane Shutters Lead the Market

Aluminum offers a strong strength-to-weight ratio, so a homeowner can lift and hang panels without a crew. It forms a thin oxide layer that protects it from rust, which is critical near salt water. It also accepts powder coating and anodized finishes, so shutters can match trim colors instead of looking industrial.

The material appears across nearly every shutter style:

• Storm panels: corrugated aluminum sheets that bolt or slide into tracks over windows. The most affordable style.
• Accordion shutters: folding aluminum blades stored beside the window and pulled closed before a storm.
• Roll-down shutters: interlocking aluminum slats that coil into a box over the window, manual or motorized.
• Bahama and colonial shutters: hinged decorative aluminum shutters that close and lock for protection.

Because aluminum works for all of these, your choice of material often comes down to style and gauge rather than a separate material decision. Aluminum storm shutters in panel form remain the budget leader for protecting a whole house.

Gauge Explained: .050 vs .063 Aluminum

Gauge, the thickness of the aluminum sheet, drives impact strength and stiffness. For hurricane storm panels, the two common thicknesses are .050 inch and .063 inch.

Thicker .063 panels flex less under wind pressure and deflect debris better, so they can span taller openings and stay farther from the glass during a storm. They are also about 25 percent heavier, which matters when you are lifting dozens of panels. Thinner .050 panels are easier to handle and cheaper, and they meet code for many openings when installed per the product approval.

Gauge alone does not prove protection. Corrugation depth, alloy temper and the spacing of fasteners all affect performance. Always check the product approval document, which lists the maximum span, required gauge and anchor spacing for each opening size. A panel that is fine for a 4 foot window may not be approved for a 7 foot patio door.

Corrosion in Coastal Areas

Aluminum does not rust, but it can still corrode. Salt spray, standing water and contact with other metals cause pitting and white powdery oxidation over time. Homes within a mile or so of the ocean see this most.

Galvanic Corrosion

The biggest threat is galvanic corrosion, which happens when aluminum touches a dissimilar metal like plain steel or copper in the presence of salt water. The aluminum sacrifices itself and pits rapidly. Use stainless steel or properly coated fasteners specified by the manufacturer, and avoid mixing hardware from different systems.

Protecting Panels and Tracks

• Rinse shutters and tracks with fresh water after storms and every few months near the coast.
• Store panels dry and off concrete floors, separated by spacers so moisture does not trap between them.
• Lubricate accordion and roll-down tracks with a manufacturer-approved silicone lubricant, not grease that holds salt and grit.
• Inspect anchors and sill tracks yearly for pitting, cracking or loose fasteners.

Finishes: Mill, Anodized and Powder Coated

Mill finish is bare aluminum straight from production. It is the cheapest and develops a dull grey patina over time, which is fine for storage panels but can look industrial on the house.

Anodized aluminum has a thickened oxide layer that hardens the surface and improves corrosion resistance. Colors are usually limited to clear, bronze and similar metallic tones.

Powder coating bakes a durable colored finish onto the metal. It is the standard on roll-down, accordion and decorative shutters, available in white, beige, bronze and custom colors. Scratches in powder coat should be touched up promptly near salt water, since corrosion can creep under the finish from a chip.

Aluminum vs Steel vs Polycarbonate

Metal storm shutters come in both aluminum and steel, and clear polycarbonate panels are a growing third option. Each has a place.

Steel Storm Shutters

Galvanized steel storm shutters are the cheapest panels per square foot and resist denting from debris better than thin aluminum. The downside is weight: steel panels can be roughly twice as heavy as aluminum, making installation hard on second-floor windows. Galvanizing protects them for years, but scratches, cut edges and salt exposure eventually lead to rust stains on siding and stucco.

Polycarbonate Panels

Clear polycarbonate panels are lighter than aluminum and let daylight into the house during a storm, which helps when the power is out. They cost more and can scratch, yellow or haze from UV over years. They also need careful storage to avoid warping.

How They Compare

• Weight: polycarbonate lightest, aluminum light, steel heaviest
• Cost: steel lowest, aluminum moderate, polycarbonate highest
• Corrosion: polycarbonate none, aluminum good with proper hardware, steel risk of rust
• Light: only polycarbonate lets light in
• Dent resistance: steel best, aluminum fair to good with .063 gauge

Metal hurricane shutters made from aluminum strike the best balance for most homeowners who must install panels themselves. Some buyers search for aluminium hurricane shutters using the international spelling; the material is identical.

Installation Considerations and Safety

Permanent tracks, anchors and headers should be installed before hurricane season, ideally by a contractor familiar with the product approval. Anchors must go into solid structure (concrete block, poured concrete or wood framing) at the specified spacing. Hollow cores, rotted framing or stucco alone will not hold under storm loads.

Hanging panels involves ladders, often in wind and rain as a storm approaches. Practice ladder safety:

• Use a sturdy extension ladder on firm, level ground at the proper angle, and have a helper hold the base and hand up panels.
• Never stand on the top rungs or overreach to the side; move the ladder instead.
• Wear gloves; aluminum panel edges are sharp.
• Install upper-floor panels early, before wind picks up, or choose roll-down or accordion shutters for those windows.
• For openings on two or more stories, hire a pro with proper equipment rather than working high on a ladder.

Motorized roll-down shutters require wiring. That work belongs to a licensed electrician, and any repair to the motor or controls should start with the breaker off and power confirmed off with a non-contact voltage tester.

Cost Ranges

Aluminum storm panels are the most affordable aluminum option, generally priced per square foot of opening and rising for .063 gauge. Accordion shutters cost more per opening, and roll-down shutters sit at the high end, especially motorized versions. Steel panels come in under aluminum panels, while polycarbonate panels typically cost more. Professional installation of tracks and anchors adds to the total but is often required for permits and insurance discounts. Many insurers offer premium credits for approved opening protection, which can offset part of the cost over time.

When to Call a Professional

Hire a licensed contractor for permanent track installation, accordion and roll-down systems, and any home where windows sit on a second story or higher. Most coastal jurisdictions require permits for shutter installation, along with inspections that confirm anchor type and spacing. A pro also ensures the system matches its product approval, which protects your insurance coverage and the shutter’s real-world performance.