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Firewall braced by rated floors and roof

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I have a small addition which contains stairs elevator and 5 floor levels (3 main levels and 2 partial levels). The existing building that we are connecting to is at the maximum area and therefore we need a 2 hour "firewall". 

We are building a new firewall but because of the broken up nature of the new building, the fall away concept gets quite complicated and expensive. 

One thought was to use 2 hour precast hollowcore floors and hard tie them into the firewall. If the floors and roof match the rating of the firewall, then the wall should be stable in a fire for the required period. 

Is the intent of IBC 705.2 met with this construction?

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