Printed from the blog of Lori Greene, AHC/CDC, CCPR, FDAI
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Feb 23 2009

Door Gap Gauge

Category: FDAI,Fire DoorsLori @ 6:20 pm Comments (2)

door-gap-gaugeThe instructors in my Fire Door Assembly Inspector (FDAI) class showed us a really handy gauge to measure clearances around fire rated doors, and since I’m going to do my first *official* inspection tomorrow I tracked one down.  It can easily and accurately measure 1/16″, 1/8″, 3/16″, 1/4″, and 3/8″ gaps, and a 3/4″ undercut.  For only $18.95, you can be the proud owner of your own Door Gap Gauge by shopping online at

For those of you who are wondering why anyone would ever want to measure their door gaps, NFPA 80 limits clearances for fire rated doors to the following:

  • Wood Doors – 1/8″ at head, jambs, and meeting stiles of pairs, 3/4″ at sill
  • Hollow Metal Doors – 1/16″ – 3/16″ at head, jambs, and meeting stiles of pairs, 3/4″ at sill

Note: I am not in any way affiliated with

2 Responses to “Door Gap Gauge”

  1. Bridget Llorens says:


    We just want to inquire how much is the price for 100 pcs door gap gauge plus the shipping cost to Doha, Qatar?
    In addition to this, are you doing a personalise door gap gauge? (We just need to put Company Logo on the Door Gap Gauge). Is it possible? if Yes, how much is the cost for personalise door gap gauge 100pcs?

    Please send us quotation and sample.

    Looking forward to hearing from you.

    Bridget Llorens

  2. J says:

    This could come in very handy for installation jobs!

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