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Fire Membrane Joist (AJS® 24 FMJ) One-Step Fire Solution




Met ICC-ES acceptance criteria for fire protection of residential floors. Code approved through ICC-ES ESR 1144. AJS® 24 FMJ has passed the E119 fire test as required to establish equivalency to dimension lumber joists.


  • AJS® 24 FMJ arrives at the jobsite ready to be installed.
  • No Specific top and bottom orientation to help assure correct framing every time.
  • Web holes may be cut the same as with non-protected joists.
  • Non-corrosive to fasteners.
  • Has met stringent durability standards required by the building code.
  • 2x4 flange means longer, stronger spans; wider nailing surface.
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