Fireblocking in a two+ family dwelling

[drw]

IRC 602.8 says that "Fireblocking of cornices of a two-family dwelling is required at the line of dwelling unit separation." Would you interpret this to mean that the attic cannot be open across multi-family units? I cannot come up with a mental picture of "fireblocking of a cornice" in the context that I think of a cornice.

[Bill Kibbel]

R602.8 is not describing anything in an attic.

You'll want to read through section R317, "Dwelling Unit Separation". It states that a fire resistant wall assembly needs to extend to the underside of the roof sheathing (unless the ceiling assembly below the common attic meets the exception).

[Juliana Terra]

Could someone explain what could be the cornices of a two-family dwelling? 

[Mike Lamb]

This isn't a 2 family unit but I assume this is the intention.

Edited December 18, 2020 by Mike Lamb
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