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Cutting the bottom of a fire-rated door

jar546

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If a fire rated door must be cut to make room for new, much higher tile, can it be legally done?

Would a letter from the manufacturer's engineer suffice or would testing be required?
 
From the "la puerta" guru



NFPA 80 specifically allows the following preparations to be made on the job site:

  • Holes for surface-applied hardware
  • Function holes for mortise locks
  • Holes for labeled viewers
  • A maximum 3/4-inch undercutting of wood and composite doors (verify this with the door manufacturer before modifying the door)
  • Installation of protection plates

https://idighardware.com/2018/12/qq-job-site-preps-for-fire-doors/
 
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