Fire Door Ratings

[rosegamble]

Hi everyone. Working with a R-2 building. There is a corridor connecting the dwelling units (1 hour fire partition at the corridor).

For doors from dwelling units into the corridor, I had thought per Table 716.1(2) that the doors would be required to be rated 20 minutes under the fire partition "corridor" row. However... my commentary confused me by stating that "1/3 hour doors are required for corridors and 3/4 hour doors are required for dwelling and sleeping unit separations."

I guess the wall between the corridor and the dwelling unit is both a corridor wall and a wall serving as a dwelling unit separation. I don't know what scenario there would be a door between residential dwelling units so I'm not sure what the commentary is saying exactly, if it's NOT referring to my scenario.

Just checking... you all interpret this condition as requiring 20 minutes, right?

 

[RLGA]

What is the "commentary" source?

 

[rosegamble]

It's the official ICC code commentary for the IBC (granted from 2018). The applicable code is 2021 though.

 

[RLGA]

Okay, I found the quote.

Dwelling/sleeping unit doors into a corridor are permitted to be 1/3-hour.

However, if there are doors in the fire partitions between dwelling/sleeping units, then those doors are included in the row for "Other fire partitions" in Table 716.1(2), which requires a 3/4-hour rating unless the fire partition rating can be reduced to 1/2 hour. An example would be communicating doors in adjoining rooms in a hotel/motel.

 

[rosegamble]

Okay, I found the quote.

Dwelling/sleeping unit doors into a corridor are permitted to be 1/3-hour.

However, if there are doors in the fire partitions between dwelling/sleeping units, then those doors are included in the row for "Other fire partitions" in Table 716.1(2), which requires a 3/4-hour rating unless the fire partition rating can be reduced to 1/2 hour. An example would be communicating doors in adjoining rooms in a hotel/motel.

Got it. Thank you. I didn't think about that hotel situation.

 

[ICE]

How many ratings are actually available? 20 minute, 3/4 hour, 1 hour, 2 hour, etc.?

 

[Yankee Chronicler]

Fire Rated Door Labels / Ratings - Archtoolbox

Fire rated doors and frames are covered, including a chart of the minute/hour ratings, maximum glass size, and other requirements.

www.archtoolbox.com