The Roofing Book

Materials / Stone-Coated Steel

Stone-Coated Steel

UL 2218 Class 4

Steel panels with an adhered stone-granule surface, formed into tile, shake, or shingle profiles. Combines the impact and wind performance of steel with the appearance of tile or wood at a fraction of the weight.

Category family
metal
Typical lifespan
40–70 years
Typical wind resistance
rated assemblies commonly to 120 mph or higher
Typical fire rating
Class A
Max impact class
UL 2218 Class 4
Weight per square
120–160 lbs
Cost band
$$$
Slope suitability
steep
Typical warranty
40–50 years
Pros
  • UL 2218 Class 4 impact resistance on many products
  • lightweight versus clay or concrete tile
  • non-combustible Class A assemblies
  • tile or shake appearance
Cons
  • higher cost than exposed-fastener panels
  • requires trained installers
  • fewer color changes after install
Colorado notes
  • hail_performance: Class 4 stone-coated steel is a popular impact-resistant tile alternative in the Colorado hail belt
  • altitude_uv: stone granules shield the coating from high-altitude UV

Manufacturers

Westlake Royal Roofing Solutions

Named products

DECRA ShakeWestlake Royal Roofing Solutions DECRA Shake XDWestlake Royal Roofing Solutions DECRA Shingle XDWestlake Royal Roofing Solutions DECRA TileWestlake Royal Roofing Solutions DECRA Villa TileWestlake Royal Roofing Solutions Unified Steel Barrel-Vault TileWestlake Royal Roofing Solutions Unified Steel Cottage ShingleWestlake Royal Roofing Solutions Unified Steel Granite-Ridge ShingleWestlake Royal Roofing Solutions Unified Steel Pacific TileWestlake Royal Roofing Solutions Unified Steel Pine-Crest ShakeWestlake Royal Roofing Solutions

Related guides

Asphalt vs. Metal vs. Tile Wind & Fire Ratings New Roof Cost Class 4 Impact-Resistant Shingles Class 4 Insurance Discounts Metal Roofing in Colorado

Sources