Metal Roofing Panel Guide

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Coverage Width Is What Fits Across the Eave

Overall (nominal) width is the full sheet from edge to edge. Coverage width is what remains after the side lap. Supplier guides such as Mid Florida Metal Roofing Supply’s coverage-width article exist because crews keep ordering from the bigger number and run short.

• Exposed R-panel / PBR: MBCI publishes 36 in coverage for PBR — that is the number for takeoff, even when overall coil looks wider.
• Standing seam: commonly 12–18 in coverage; 16 in is a frequent residential default. The seam eats the difference between coil and net coverage.
• Corrugated / 5V: often lands near 24 in net; 7/8 in corrugated can lose 2–4 in to the lap versus overall width.

Why Metal Is Often Ordered Custom-Length

Shingles come in bundles sized to cover a fraction of a square. Metal panels are frequently mill-cut to the eave-to-ridge slope length so each sheet runs full length with fewer end laps. That is why the calculator asks for panel length in feet and prints total linear footage — the order ticket looks like “N pieces @ L feet,” not “M bundles.”

Stock lengths you cut on site need a higher waste pad. Mill-cut to the run length still needs waste for hips, valleys, and penetrations — just usually less than asphalt course waste.

Standing Seam vs Corrugated / Exposed Fastener

Standing seam hides fasteners under clips or seamed ribs. Narrower coverage, more panels across, premium look, better thermal movement story. Hand seamers and seaming machines show up on the truck.

Exposed-fastener R-panel / PBR and corrugated through-fasten with hex-washer screws. Wider coverage (often 36 in on PBR), faster on ag and many residential jobs, more exposed fastener maintenance over decades.

Both still need underlayment decisions, ice & water in cold climates, and a structure that can carry snow load — see the ice & water calculator and snow load calculator.

Waste: Often Lower Than Asphalt, Not Zero

Industry estimating notes commonly put mill-cut metal field waste around 5–10% on simple gables and 10–15% (sometimes more) on hips, valleys, and dormers — frequently lower than asphalt’s 10–25% style pads because you are not losing starter and end courses the same way. Using 0% because “it is custom-cut” is how hip roofs arrive short.

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