TomLeonardPE
Member
- Joined
- Oct 18, 2012
- Messages
- 4
I am the structural engineer for an HVAC project where we are setting a large air handling unit on an existing hospital roof. The roof is over a single story portion of the bulding and more than 20 feet from the nearest three story portion. The steel beams are raised approximately 15" to 24" above the roof line, supported by steel pipe posts that are bolted to the existing roof beams directly above existing columns. Since welding was not permitted in this area, the posts could not be simply welded to the existing columns. Oversized baseplates were used to bolt to the roof beam top flanges.
The existing below the steel is fireproofed and the code official has determined that the dunnage steel must be fireproofed as well per table 601 (IBC 2009). I am interpreting the structure to be a rooftop structure under Chapter 15 and required only to be of non-combustible construction. I can find no reference to dunnage steel in the Code. I have never seen fireproofing required on dunnage and neither has anyone I've discussed this with (fabricators,architects, other code officials). Does anyone know of a section of the code I can refer the local official to. He is requiring this or fireproofing.
The existing below the steel is fireproofed and the code official has determined that the dunnage steel must be fireproofed as well per table 601 (IBC 2009). I am interpreting the structure to be a rooftop structure under Chapter 15 and required only to be of non-combustible construction. I can find no reference to dunnage steel in the Code. I have never seen fireproofing required on dunnage and neither has anyone I've discussed this with (fabricators,architects, other code officials). Does anyone know of a section of the code I can refer the local official to. He is requiring this or fireproofing.