Metal Siding Impact Guide

Aluminum vs. Steel Siding: The Honest Conversation About Dents

No responsible contractor should describe conventional metal siding as dent-proof. Hail, windborne debris, ladders, branches, baseballs, lawn equipment, and jobsite handling can damage exterior panels.

Steel generally offers greater resistance to ordinary denting than aluminum, but that comparison is not the entire decision. Panel design, thickness or gauge, substrate support, coating, temperature, impact location, and installation quality all influence the result.

The better sales conversation is not, “Which siding cannot be damaged?” Every exterior material can be damaged. The useful question is, “Which material gives this homeowner the right balance of strength, weight, appearance, corrosion behavior, and future repairability?”

Why Aluminum Dents More Readily

Aluminum's light weight is one of its practical advantages. It is easier to transport and handle than many heavier claddings, does not red-rust, and will not absorb moisture. Gentek identifies durability, affordability, low maintenance, light weight, and rust resistance among aluminum siding's primary benefits.^[1]

The same material characteristics that keep aluminum light can make the panel more susceptible to visible dents or creases from concentrated impact. A ladder pressed against the wall, a fast-moving hailstone, or debris striking a poorly supported area can leave a permanent surface change.

Smooth siding can reveal dents particularly clearly when sunlight travels across the wall at a low angle. Woodgrain texture may visually soften minor surface changes, but it does not prevent physical damage.

Compare Suburban Wholesale's smooth Gentek Deluxe Aluminum Siding with Woodgrain Series 2000 to see how surface design changes the appearance of the panel.

Why Steel Generally Resists Ordinary Denting Better

Steel's greater material strength generally allows it to resist routine impact and denting better than many aluminum panels. That does not mean steel cannot be dented, scratched, creased, or punctured.

Gentek describes its steel siding products as engineered for strength, durability, weather resistance, and low maintenance. Product construction, coating, profile, and warranty provisions vary by line.^[2]

Gentek SteelTek Supreme uses 29-gauge Galvalume AZ-50 steel with Kynar PVDF coating technology. Gentek positions the product around resistance to hail damage, denting, scratching, chalking, and color change, subject to the written warranty, exclusions, and product limitations.

Very large hail, windborne debris, damaged coatings, mishandling, or improper installation can still affect a steel exterior. Marketing statements should never be converted into a promise that a real-world storm cannot damage the home.

Panel Geometry Changes Impact Performance

Metal type is only one variable. Bends, ribs, butt projections, locks, and profile geometry add stiffness to a panel. A broad, unsupported flat area may respond differently from a panel with several formed bends.

Contractors should compare the exact products—not generic pieces of aluminum and steel. Important characteristics include:

• Material and alloy or steel construction
• Panel thickness or gauge
• Profile shape and formed bends
• Butt projection and exposure
• Locking and fastening design
• Wall support behind the panel
• Factory coating and surface texture

One manufacturer, profile, or gauge should not be used to make a universal claim about every aluminum or steel siding product.

Substrate Support Matters

Siding is installed over a wall assembly. Sheathing condition, underlayment, fastening, and wall flatness influence how the cladding responds to impact.

New siding cannot compensate for rotted sheathing, missing fastener support, or severely uneven framing. Before installation, contractors should inspect and correct the substrate according to current manufacturer instructions and applicable requirements.

A poorly prepared wall can also make cosmetic distortion more visible. Straight, properly supported courses create a better starting point for either metal system.

Impact Can Damage More Than the Panel Shape

A metal panel can remain generally flat while its coating is scratched, chipped, or otherwise damaged. Contractors should inspect both the shape of the siding and the condition of the factory finish.

After a storm or impact, look for:

• Dents and creases
• Punctures or split edges
• Scratched or fractured coatings
• Disengaged locks
• Distortion around fasteners
• Loose corners or accessories
• Opened seams at custom-formed trim

Gentek publishes separate written warranties for its aluminum siding, steel siding, soffit, fascia, and coil products. Coverage differs by product, and exclusions, remedies, transfer terms, and claim procedures apply.^[3]

Do Not Forget Soffit, Fascia, and Rainware

Hail that affects siding may also dent fascia coverings, gutters, downspouts, window wraps, and soffit panels. These components may use different thicknesses, alloys, profiles, and coatings than the main siding.

Inspect the full metal exterior, including soffit and fascia, trim coil, and rainware.

Document each product separately. Damage to one component does not prove damage to every metal surface on the building.

Repairability Should Be Part of the Purchase Decision

Homeowners commonly compare siding based on initial appearance and warranty language. They should also ask what happens if one panel is damaged several years later.

Before choosing a product, consider:

• Whether individual panels can be removed practically
• How the profile locks together
• Whether replacement accessories are likely to be obtainable
• How a fresh panel may compare with a weathered wall
• Whether leftover labeled material can be stored
• Which purchase and warranty records should be retained

Even when the original product remains available, a new factory finish may not look identical beside siding exposed to years of weather. Physical samples should be compared before a repair scope is finalized.

Which Material Is the Better Choice?

Choose aluminum when lightweight construction, red-rust resistance, and a specific smooth or woodgrain aluminum appearance are the leading priorities.

Choose steel when greater resistance to ordinary denting, material strength, and substantial construction justify its added weight and product-specific installation requirements.

Compare Suburban Wholesale's complete Gentek aluminum siding selection with the Gentek steel siding collection.

The best product is not the one with the most aggressive sales claim. It is the system whose verified specifications, appearance, installation requirements, warranty, and tradeoffs fit the actual project.

Product specifications, test information, warranty provisions, profiles, colors, availability, and installation requirements may change. No siding is storm-proof or damage-proof. Verify the exact product, current manufacturer documents, project conditions, and applicable requirements before ordering or installing siding.