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Fire Door Gaps

by Lori Greene, DAHC/CDC, CCPR, FDAI, FDHI, on Sep 23, 2020 1:00:22 AM

Q: I see several fixes for doors with excessive undercut. My problem is I have a building that is ten years old that has excessive clearance over 1/8-inch at the top of 20-minute fire-rated doors. There have been no alterations since they were installed. I am wondering what is available that will legally fix this problem.

A: There are a few products that can be used to address oversized clearances on fire doors.  Here’s a recent blog post about some of them:  Maybe the NGP 9200 would work for your situation.  The important thing is to make sure that the product you use is listed for use on a door with excessive clearance.  Most gasketing listed for use on a fire door is only listed for doors with the correct clearance and will not correct doors that have too much clearance.

For expert code advice on fire doors and hardware, visit Lori's website at

Topics:Fire Doors

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