Metal Roof Panels, Linear Feet, and Fasteners

ScopeThe panel count from the product's net coverage width (not the sheet width), the total linear feet, the slope-area squares, and the fasteners from the wind-zone pattern. A 36 in exposed-fastener panel and a 16 in standing-seam panel covering the same plane differ by more than a factor of two in panel count - which is why net coverage width, not square footage, sets a metal order. Per roof plane (double for a symmetric gable). A material takeoff, not a wind-uplift design.

Formula or tablepanels = ceil(eave_width_ft x 12 / panel_net_in); total_panel_lf = panels x panel_length_ft; plane_area_ft2 = eave_width_ft x panel_length_ft; squares = plane_area_ft2 / 100; fasteners = ceil(squares x fasteners_per_sq).

Source and editionMetal Construction Association (MCA) and Metal Roofing Alliance (MRA) installation references and the manufacturer panel-coverage and fastening charts, by name; the panel-count and fastener relations are first-principles arithmetic.

Free accessThe panel-count and fastener relations are public roofing-takeoff arithmetic; the net coverage width and the wind-zone fastening pattern are the manufacturer's published values.

What governsEstimate. AHJ and licensed professional govern.

API field nameseave_width_ft, panel_length_ft, panel_net_in, fasteners_per_sq, panels, total_panel_lf, plane_area_ft2, squares, fasteners

• Panel count panels = ceil(eave width in inches / net coverage width): the net coverage width, not the overall sheet width, sets the countMCA / MRA + manufacturer charts
• Slope area panel length is the on-slope eave-to-ridge length, so eave width x panel length is the plane (slope) area; squares = area / 100first principles
• Fasteners fasteners = ceil(squares x fasteners per square): the per-square count is the manufacturer's wind-zone pattern (clips replace exposed screws on standing seam)manufacturer fastening charts