Panel Cut Lists Explained: Vertical vs Horizontal

When it comes to metal building panels, orientation changes everything — not just how the building looks, but how you order materials. Understanding the difference between vertical and horizontal layouts helps you talk to customers, spot errors, and make smarter decisions on the job.

Vertical Panels

Vertical panels run up and down — from the base to the top on walls, and from the eave to the ridge on the roof. They're the default for most carport and open-structure installations.

• Panel quantity is driven by the building's length (sidewalls and roof) or width (end walls).
• Cut lengths depend on wall height or roof slope distance.
• Water drainage is excellent — ribs run straight down, channeling water off naturally.
• Vertical roofs require a ridge cap where panels from each side meet at the peak.

Horizontal Panels

Horizontal panels run left to right, wrapping around the building like siding. On the roof, they span across the building width from eave to eave.

• Wall panel quantity is driven by the wall height — how many rows stack from bottom to top.
• Roof panel quantity is driven by the building width plus overhangs.
• Cut lengths on walls follow the building length; on the roof they include end overhangs.
• Longer buildings may require splices where panels join end-to-end.

Why It Matters for Your Material Order

Switching between vertical and horizontal changes panel quantities, cut lengths, screw counts, and even which frame components you need. A building quoted as vertical won't use the same materials as the same building in horizontal — and the difference can mean dozens of extra panels and hundreds of extra screws.

This is one of the most common sources of errors in manual calculations. Getting it wrong means showing up to the job site with the wrong material count.

Quick Comparison