A standing seam panel is a length of formed metal that runs from ridge to eave and locks to its neighbor at a raised vertical seam. The fasteners sit under the seam on concealed clips, so nothing passes through the exposed face of the roof.
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These two numbers appear on every standing seam quote and change both the look and the cost, since narrower panels mean more panels and more seams to install.
| Spec | Common options | What it changes |
|---|---|---|
| Panel width | 12, 16 or 18 inches | Narrower reads finer and costs more |
| Seam height | 1, 1.5 or 2 inches | Taller sheds water better on low slopes |
| Gauge | 24 or 26 | Lower number is thicker metal |
| Seam type | Snap lock or mechanically seamed | Decides minimum slope |
A 16 inch panel is the common residential default. Twelve inch panels are a design decision you pay for.
Gauge is thickness, and the numbering runs backwards, so 24 gauge is thicker than 26. Thicker metal resists denting from hail and foot traffic and shows less oil canning across the flat of the panel.
Twenty four gauge is the usual specification for residential standing seam and 26 is a legitimate lower cost option. If two standing seam quotes differ by a few thousand dollars, gauge is one of the first places to look. See what sits inside a roofing quote for what else moves a quote.
Striations are the fine lines rolled into the flat of a panel, and pencil ribs are the heavier version. Both exist to stiffen the pan and disguise oil canning, the gentle waviness inherent in any wide flat sheet of light metal.
They are cosmetic rather than structural, and most manufacturers exclude oil canning from warranty cover precisely because it is inherent. If a perfectly flat pan matters to you, raise it before the order. what the components are called covers the rest of the system.
Sixteen inches is the common residential default. Twelve inch panels give a finer line and cost more because there are more of them; eighteen inch panels cover faster and read broader.
On a house, usually yes. The thicker metal resists denting and shows oil canning less, and the price difference is modest against the total.
Visible waviness in the flat area of a panel. It is inherent to light gauge metal, not a structural fault, and it is reduced by heavier gauge, striations and careful handling.
Usually yes on a residential roof. Panels are cut to length for the run, either at a plant or on site with a portable rollformer, so there is no horizontal joint.
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