Has anyone had an issue with metallic octagon concrete box fire ratings where installed in an elevated concrete deck? (a parking garage in this instance) Say the deck/floor slab is rated at 3hr fire. I can't find a UL assembly for this type installation. Installation has not begun, just the topic has been brought up. Seems to be a valid argument against concrete boxes, although this is a common installation practice. Any help is appreciated.
Metallic concrete box fire resistance
- Thread starter brentp
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mgookin
Senior Member
- Location
- Fort Myers, FL
- Occupation
- Retired inspector, plans examiner & building official
If it is embedded in the concrete, whatever design professional assigned the 3hr rating to that deck needs to review it and make sure his requirements are not compromised. What he's going to be looking for is maintaining minimum concrete thickness and maintaining minimum concrete cover on the reinforcement.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Which means that it may even come down to locating the boxes between rebar instead of directly opposite rebar.
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