Roofing Directory

Materials / Corrugated Metal Panel

Corrugated Metal Panel

UL 2218 Class 4

Wavy or ribbed metal panels (typically galvanized or Galvalume steel, sometimes aluminum) fastened through the face with exposed screws. An economical exposed-fastener metal roof common on agricultural, industrial, and budget residential roofs.

Category family
metal
Typical lifespan
25–40 years
Typical wind resistance
rated assemblies commonly to 120-140 mph
Typical fire rating
Class A
Max impact class
UL 2218 Class 4
Weight per square
50–100 lbs
Cost band
$$
Slope suitability
both
Typical warranty
25–40 years
Pros
  • low installed cost among metal systems
  • lightweight
  • fast installation over purlins or decking
  • recyclable steel
Cons
  • exposed fasteners require periodic gasket maintenance
  • can cosmetically dent from large hail
  • fewer concealed-fastener aesthetics
Colorado notes
  • hail_performance: resists puncture and typically passes UL 2218 Class 4, but large Front Range hail can leave cosmetic dents in the pan
  • altitude_uv: factory-applied coatings resist fading under high-altitude UV

Related guides

Asphalt vs. Metal vs. Tile Wind & Fire Ratings New Roof Cost Class 4 Impact-Resistant Shingles

Sources