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Building a Flammable Storage Locker

- April 30, 2019 by Jason Rozar (View all posts by Jason)

The need for flammable storage lockers can create a lot of questions for a company. Typical questions include: “What are the requirements for a flammable storage locker?” and “Can I build my own Flammable Locker from wood?” A flammable locker can be constructed of wood as long as it meets the requirements set forth by the OSHA Standards for the Construction Industry.

The standard permits both metal and wooden storage cabinets to be used for the storage of flammables. However, they have to be specifically designed and constructed to meet the following guidelines according to OSHA:

  • Storage cabinets must limit the internal temperature to not more than 325ºF when subjected to a standardized 10-minute fire test.
  • All joints and seams have to remain tight and the door must remain securely closed during the fire test.
  • Storage cabinets shall be conspicuously labeled, “Flammable – Keep Away from Open Flames”.

If you decide to build a wooden storage cabinet, OSHA has some additional requirements you will have to meet:

  • You have to use plywood with at least a 1 inch thickness for the bottom, sides, and top of the cabinet.  The plywood cannot break down or delaminate under standard fire test conditions.
  • You have to rabbet all joints and they must be fastened in two directions with flathead wood screws.
  • If you decide to have more than one door, there must be a rabbeted overlap of not less than 1 inch.
  • Steel hinges have to be mounted so that they will not lose their holding capacity due to loosening or burning out of the screws when subjected to fire.
  • You also have to paint the cabinet inside and out with fire retardant paint.