Fire Proof Doors, how many minutes

In a 3 or 4 family converted dwelling such as a brownstone, how many minutes fireproof are the apt doors supposed to be?

I saw this building code citation:

Exit doors and doors providing access to exits shall
comply with the following:
(a) Exit doors. – Doors for required exits shall be
self-closing swinging doors with a one and one-half
hour fire protection rating, except in occupancy group
J-3 buildings and except that:
(1) Exterior street floor exit doors having an exterior
separation of more than fifteen feet need not have a
fire-protection rating.
(2) Doors into stairs and exit passageways shall have
at least a three-quarter hour fire protection rating

hkapstein

in General Discussion 4 years and 8 months ago

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hkapstein | 4 years and 8 months ago

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Thanks, that seems more comparable.

mozeeatupu | 4 years and 8 months ago

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I’m in a 5 family building and the door label I showed is for one of the units, not the front building door.

hkapstein | 4 years and 8 months ago

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Thanks. In 90 minute doors, you can get a mineral core wood door, but more than 90 it would be only metal doors like yours. Unfortunately, I doesn’t help me much because the fire door requirements are different for 1 and 2 fams vs 3+.

dorkofwindsor | 4 years and 8 months ago

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Urbandad, I’m in a 2 fam and have three of these “knock down” doors in the interior, including the utility room. They were done by a previous owner’s reno. They are rather heavy and unsightly. For a rental front door though I think pretty standard like what you would see in a prewar condo etc. They are literally everywhere, cheap and take 10 minutes to install.

hkapstein | 4 years and 8 months ago

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Ok this is good to know. Dorkofwindsor and mozeeatupu, are you in a 3 or 4 family building? 90 minutes seems like it would be sufficient for the fire rated wall assembly per the section of code I cited and others, but it’s very helpful to get confirmation that this is what others are using.

mozeeatupu | 4 years and 8 months ago

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My doors are also 90 minutes [IMG_20201222_110138__01](//muut.com/u/brownstoner/s3/:brownstoner:RZ6K:img_20201222_110138__01.jpg.jpg)

stevecym | 4 years and 8 months ago

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Get this, i only know anything about any of this from commercial. So i would not stick my neck out to answer a res question. But years ago we had work being done in a building and i told the contractor “that door is supposed to be fire rated”. He looks at it. Removes it and runs it to LIFPD. They tag the door, charge him a couple hundred for the tag, and he brings the door back. Same door, more money to call it fireproof.

dorkofwindsor | 4 years and 8 months ago

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mine: 90 min
[IMG_6029](//muut.com/u/brownstoner/s3/:brownstoner:mcW2:img_6029.jpeg.jpg)

hkapstein | 4 years and 8 months ago

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Thanks Steve. I did ask a supplier once and didn’t walk away feeling confident that they knew anything. This is probably more in the realm of architects and engineers. But maybe your guys know something I don’t.

stevecym | 4 years and 8 months ago

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i would calll Long Island Fire Proof Door and ask them. Pretend you have to buy a door.

hkapstein | 4 years and 8 months ago

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I found the citation, but is this the correct interpretation? The apt doors for an apt should be 90 minutes?