Originally Posted By: roconnor
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Russel is right that for new construction the current IRC only requires a 20 min door (1-3/8" solid min) and there is no self closing requirement. A plain hollow core wood door can’t meet the 20 min fire rating.
Fire doors for commercial/industrial buildings must be self-closing according to the IBC, but that does not apply to residential buildings.
Note that my state (NY) changed the fire rating to require a 3/4-hour rated self-closing door. There is some talk about amending the IRC to add the self-closing door requirement.
I think it's a good idea in general to have self-closing fire doors, but some say it's not likely for a residential garage door to be left open, and they have a point.
Robert O'Connor, PE
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NACHI Education Committee
I am absolutely amazed sometimes by how much thought goes into doing things wrong