Two story building; due to design issues the EXIT stair is a rated vertical exit. Therefore, fire barrier walls must be supported by construction having the same rating as the fire barrier.
No problem using CMU as the firebarrier walls for two stories. The issue is contiguous structural framing (Construction Type II-B) that passes through the entire rated vertical EXIT. Per 1020.1.2 (IBC 2006) penetrations must be intended for the EXIT only and cannot pass completely through the EXIT. If the structural steel is a penetrating item and completely runs through the EXIT horizontally, is the structural steel an issue?
Would it not be an issue if it was protected for the same rating as the stair tower while it is inside the stair tower?
Would additional protection be required for the structural steel outside the stair tower to its connection point at a column?
No problem using CMU as the firebarrier walls for two stories. The issue is contiguous structural framing (Construction Type II-B) that passes through the entire rated vertical EXIT. Per 1020.1.2 (IBC 2006) penetrations must be intended for the EXIT only and cannot pass completely through the EXIT. If the structural steel is a penetrating item and completely runs through the EXIT horizontally, is the structural steel an issue?
Would it not be an issue if it was protected for the same rating as the stair tower while it is inside the stair tower?
Would additional protection be required for the structural steel outside the stair tower to its connection point at a column?
