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Fire Rating Question

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Philarchitect

Registered User
Joined
Dec 24, 2021
Messages
3
Location
Philadelphia
Hello,
Our office is constructing an addition above an existing 7-story structure. The existing structure was originally constructed out of module steel boxes with light gauge cold-rolled steel floor, ceiling & wall infill framing. The new floor will be posted up above the existing roof framing. The final assembly will be a combination of new floor & old roof framing.
My question pertains to the proper fire-rated assembly. I have created a detail which should make this a bit more clear. Use the link below to access the detail. Hopefully someone can give me some advice.

Microsoft OneDrive

1drv.ms 1drv.ms
 
Philarchitect said:
Hello,
Our office is constructing an addition above an existing 7-story structure. The existing structure was originally constructed out of module steel boxes with light gauge cold-rolled steel floor, ceiling & wall infill framing. The new floor will be posted up above the existing roof framing. The final assembly will be a combination of new floor & old roof framing.
My question pertains to the proper fire-rated assembly. I have created a detail which should make this a bit more clear. Use the link below to access the detail. Hopefully someone can give me some advice.

Microsoft OneDrive

1drv.ms 1drv.ms
Click to expand...
Update: I forgot to mention that I am looking for a 1-hour fire rating
 
How are the existing floors fire protected?

Gypsum Association FC-4490 provides 1-hour fire rating. The double layer of 5/8" type X gypsum board provides 1 hour protection for the framing.
 
Paul Sweet said:
How are the existing floors fire protected?

Gypsum Association FC-4490 provides 1-hour fire rating. The double layer of 5/8" type X gypsum board provides 1 hour protection for the framing.
Click to expand...
Thank, but unfortunately that assembly contains a plywood subfloor which would not be permitted in the Type-II, non-combustible construction.
 
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