Steel Stiffened Laminated Core Door (Trio)


Strong, Beautiful and Green, best describes Trio, the innovative new product from Ceco Door. Trio is a fusion of composite and steel stiffened cores to create a new patent pending laminated core design like no other. Trio contains all the aesthetic and insulating benefits of a Ceco Imperial foam door but with the added strength of a steel stiffened laminated core.


  • Steel stiffened laminated core for added strength and durability


  • No vertical weld marks on door face sheets so aesthetically pleasing gloss paint can be applied
  • Many door designs and color options available


  • High recycled steel content for LEED points up to 58.8%.


  ADEX Platinum Award 2010

Winner of the 2010 ADEX Platinum Award for Design Excellence

Trio Standard Features

  1. 18 gauge face sheets, 16 and 14 gauge optional
  2. 16 gauge inverted end channels welded to both face sheets for added strength
  3. 14 gauge closer reinforcement
  4. 18 gauge face sheet plus 22 gauge core plate is effectively 14 gauge thick on threat side of the door
  5. 22 gauge steel stiffeners spaced every 6" apart and welded to core plate every 5" on center for total surface support.

Other Features and Options

Available Sizes:

  • 4’0” x 9’0”maximumsingle, 8’0” x 9’0”maximum pair


  • Cold rolled or galvanneal steel

Core Options:

  • Injected polyurethane foam or fiberglass insulation in between the stiffeners

Edge Construction:

  • Mechanically interlocked, hemmed vertical edge seams
  • Seamless edges available

Hardware Reinforcements:

  • Reinforcing for most lock preps, including concealed hardware
  • 7 gage steel hinge reinforcements


  • Electrostatically applied prime base coat
  • Optional Colorstyle factory pre-finish


  • Sound Transmission Class: STC 38 for fiberglass core (ASTM E90-09 & E413-04) fully operable
  • Physical endurance testing: Meets ANSI A250.4 performance test, level A (1,000,000 cycles) class 1 stiffness
  • Fire rating: Up to and including 3 hours 4’0”x 8’0” singles and 8’0”x 8’0” pairs (no astragal required!) up to 8’0”x 9’0” pairs 90 min. (UL10C) UL & WH agencies