Metal Cladding Materials

The metal behind a wall panel decides most of what the finished wall can do: weight per square meter, weathering, available finishes, cost, and maintenance. This cluster is the metal-selection layer of the metal wall coverings guide. It does not replace a system choice. The same aluminum coil can be a cassette, a composite skin, or a perforated screen.

Use this cluster after you know whether the wall is interior or exterior and whether it is a rainscreen skin, an insulated sandwich or a screen. Then pick the metal that can do that job in that climate.

How to read a material page

Each material guide follows the same structure so metals can be compared like-for-like: what the metal is, the panel forms it usually takes, strengths, limits, where it fits, and the specification traps that belong to that metal. Performance tables on those pages are orientation, not test reports. Product-specific and assembly-specific numbers still come from the manufacturer and the listed wall.

Industry context for aluminum sits with the Aluminum Association. Broader metal-wall practice sits with the Metal Construction Association.

The six metals this hub covers

Aluminum wall panels are the common architectural answer. Density is about one third of steel, so subframes and renovation loads get smaller. A natural oxide film plus PVDF, powder coat or anodizing covers most colour work. Softness and thermal movement are the usual limits. Aluminum is also the usual face metal for Metal Composite Material panels.

Steel wall cladding is the economical structural skin. It needs galvanizing and a coating system on exteriors. At equal thickness it is stiffer than aluminum, which is why it dominates corrugated fields and insulated metal panel faces. Uncoated steel is not an exterior finish.

Stainless steel wall panels are an alloy and finish decision. Grade, surface and cleaning decide whether the wall stays useful in kitchens, transit interiors or chlorides. “Stainless” on a drawing without an alloy is not a specification.

Corten steel cladding develops a rust patina that becomes the finish. Runoff staining on adjacent stone, glass and paving is the project risk. Corten is a detailing system. It is the wrong choice when the client wants a rust colour without brown water.

Zinc wall cladding weathers to a gray patina and wants ventilation, compatible flashings and slopes that drain. Pre-weathered zinc is often specified to avoid a long, uneven bright period. Zinc fails when it is treated like coated aluminum and sealed against the backup.

Copper wall cladding moves from bright metal through brown toward green. Runoff and oil canning on flat bright faces need design attention. Copper is a signature metal. It is a poor substitute for a painted panel when the only requirement is “warm metal.”

What the metal does not decide

Material choice does not decide drainage. A zinc rainscreen and a zinc face-sealed box are different walls. Material choice does not decide fire classification of a composite or insulated product; the core and the listed assembly do. Material choice does not decide oil canning by itself; panel width, stiffening and gloss do.

If the remaining argument is format, open the systems hub. If it is climate versus interior accent, open the applications hub. If two metals remain, open aluminum versus steel or the matching comparison.

Climate and couples

Coastal air, de-icing salt and industrial fallout change the shortlist. Aluminum and suitable stainless alloys are often more forgiving than painted carbon steel when coatings will be damaged. Cut edges, weep paths and fastener metals still have to be written. Dissimilar metals in wet contact are a corrosion problem, not a style problem.

Living-patina metals need a place for water to go and a surface that is allowed to change. If the adjacent materials cannot accept stain, do not specify corten or untreated copper above them.

Cost position, not a quote

Relative cost on this site is a position, not a bid. Coated steel is usually the lowest metal line. Aluminum sits above it. Stainless, zinc and copper sit higher, and labour plus custom work can erase the metal difference. Read metal cladding cost before treating a coil price as the project price.

How to use this hub

1. Name exposure and drainage on the applications and systems hubs.
2. Open the one or two material guides that can survive that climate.
3. Write finish class, isolation and maintenance, not only the metal name.
4. Return to the metal wall coverings guide if the four-question sequence was skipped.