Cutting the bottom of a fire-rated door

[jar546]

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?

 

[cda]

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/

 

[ADAguy]

Good one, thank you