Metal Flashing vs. Metal Panels: What's the Difference?
Metal flashing and metal panels are both fabricated from sheet metal. The similarities end there. They serve different functions, use different gauges, and go through completely different fabrication processes. Here's how to tell them apart and why it matters.
What Is Metal Flashing?
Metal flashing is thin-gauge brake-formed sheet metal installed at transition points in a building envelope. It's not meant to be seen. It's tucked behind siding, embedded in mortar joints, and lapped by other materials. Its only job is water management: redirecting water away from joints and intersections before it can infiltrate the structure.
Common flashing profiles include step flashing at roof-to-wall intersections, counter flashing lapped over step flashing, kickout flashing at the base of roof-to-wall runs, window head and sill flashing, and base flashing at the bottom of parapet walls. Each profile is specific to its application and the geometry of the transition it protects.
Material weight is light by design: typically 24-gauge galvanized steel, 0.040" aluminum, or 20-oz copper. Flashings don't need structural stiffness. They need to hold a bend, resist corrosion, and shed water.
What Are Metal Panels?
Metal panels are an architectural cladding material. They are the visible face of a building's exterior. Unlike flashing, panels are engineered to be seen, and they're substantially heavier: typically 0.063"–0.125" aluminum or 20-gauge steel, with factory Kynar (PVDF) coatings or anodized finishes in the specified architectural color.
Panel systems include ACM (aluminum composite material, with a polyethylene core between two aluminum skins), solid aluminum panels, honeycomb-core aluminum panels for longer spans, and steel panels for industrial applications. Each system is engineered for structural rigidity, flatness, and long-term color retention under UV exposure.
At PDX Panels, ACM and honeycomb-core panels are CNC-routed and folded. The result is a dimensionally precise panel with tight tolerances. A very different product and process from brake-formed flashing.
The Key Difference
Flashing is a waterproofing element. Panels are a cladding element. The two involve sheet metal, but different gauges, different processes, different specifications, and completely different installation scopes.
Using flashing-weight material for visible panels produces visible oil-canning, surface waves, and a poor finished appearance. Using panel-weight material for hidden flashing is expensive and unnecessary. The products are not interchangeable.
When Both Show Up on the Same Job
On most commercial buildings, both show up together. Wall panels cover the face of the building; flashings and coping manage water at the panel edges, perimeter transitions, window openings, and roof connections. The two systems must be designed to work together. Panel systems without proper flashing at their edges will leak regardless of how well the panels themselves are installed.
PDX Panels fabricates both. If you need panels for the cladding and flashings for the perimeter details, we can quote the full scope. Call (503) 914-0210 or submit a quote request online.
Frequently Asked Questions
What's the difference between metal flashing and metal panels?
Flashing is a thin-gauge waterproofing element installed at transition points in the building envelope. Its only job is water management. Panels are architectural cladding, the visible face of a building, engineered for appearance and structural rigidity. They use different gauges, different fabrication processes, and are not interchangeable.
Can you use flashing material for visible metal panels?
No. Flashing-weight material oil-cans and waves on large flat surfaces, producing a poor finished appearance. Panel systems require heavier gauges with factory Kynar or anodized finishes. Using flashing stock for panels will look bad and won't hold up.
Does PDX Panels fabricate both flashings and metal panels?
Yes. PDX Panels CNC-routes ACM and honeycomb-core panels and brake-forms all standard flashing profiles. We can quote both the panel cladding and the perimeter flashings on a single job. Call (503) 914-0210 or request a quote online.
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