Steel stiffened

This core can be used for all applications including over-sized, 3-hour fire rating, detention, heavy usage and maximum durability doors.


  • SDI grades III and IV for heavy use/high abuse areas
  • Unlimited heights and widths
  • Estimated performance values:
    • R = 1.17
    • U = 0.855
    • Acoustical value: STC 24

Construction Options

  • 1-3/8″ to 3 1/4″ thickness
  • Fiberglass or expanded polystyrene (EPS) insulation options
  • Used with commercial series doors and selected specialty doors
  • 22 gauge or 18 gauge stiffeners


Lead Time Options

  • Standard: 8 to 10 business days¹
  • Express: 1 to 7 business days²

¹ Consult factory for options on larger projects
² Lead time based on available capacity at time of order

Don’t see what you need here?  Check out our commercial series doorsembossed doors or specialty doors!