3-hour horizontal assembly
3-hour horizontal assembly
(OP)
I have a project that requires a 3-hour horizontal assembly between the 1st and 2nd level and the 1st level is type IA construction. I have assumed that to meet this requirement I would need to design the floor framing system with the primary framing members as 3 hour rated and the secondary members would be 2-hour rated as listed in IBC Table 601 type IA.
The architect of record is insisting that a "3-hour Horizontal Assembly" must have all elements with a 3 hour rating.
Do I need to provide 3-hour rated concrete joists in addition to the 3-hour girders and columns of the primary framing system and slab in order to meet this requirement?
The architect of record is insisting that a "3-hour Horizontal Assembly" must have all elements with a 3 hour rating.
Do I need to provide 3-hour rated concrete joists in addition to the 3-hour girders and columns of the primary framing system and slab in order to meet this requirement?





RE: 3-hour horizontal assembly
BUT, in such matters I *NEVER* argue with the Architect. Presumably you are already on record as trying to spend less of the Owner's money (makes me wonder if the Architect is on one of their famous costs plus percentage of total cost of work contracts), and thus you have already tried to defend the client's pockets.
When there is a difference of professional opinion such as this, the tie should always go to increasing safety.
RE: 3-hour horizontal assembly
This horizontal assembly is a building separation between a parking garage and a retail store per IBC 510. Both are fully sprinkled.
RE: 3-hour horizontal assembly