Tin Roofing (Corrugated Metal)

Modern "tin roofs" are actually galvanized steel or Galvalume-coated steel with a corrugated profile. True tin-coated steel (terneplate) was historically common but has been largely replaced by more durable coatings. Corrugated metal remains one of the most affordable and fastest-to-install roofing options, widely used on agricultural buildings, sheds, porches, and budget-conscious residential projects.

Corrugated vs. Standing Seam

Corrugated panels use exposed fasteners (screws through the panel into purlins), making installation straightforward but creating potential leak points at every screw hole. Standing seam conceals fasteners and costs 2-3 times more. For outbuildings, porches, and covered structures, corrugated metal at $3-5 per square foot is hard to beat on value. For primary residences, standing seam's superior weather performance justifies the premium.

Panel Sizing

Standard corrugated panels are 26 inches wide with 24 inches of coverage after the one-corrugation overlap. Lengths range from 6 to 16 feet in 2-foot increments at most suppliers, or custom-cut to your exact measurement. Panels should run from eave to ridge without horizontal joints when possible. If horizontal joints are necessary, overlap panels by at least 6 inches with sealant between layers.

Fastener Pattern

Fasten corrugated panels at every other rib (high point) along each purlin line. At eaves, ridges, and end laps, fasten at every rib. Use screws with neoprene washers sized to the corrugation profile — overtightening crushes the washer and creates leaks, while undertightening leaves gaps. Plan for 60-80 screws per 100 square feet of roof area.