Hi Johnpaul. Thank you for checking out ASK Hilti! First, you should direct your attention to 2015 IBC code section 714.4. As you can see, only the “ceiling membrane of a roof/ceiling assembly” must be firestopped so that fire does not enter into the protected space of the roof/ceiling assembly.
Follow link to check out 2015 IBC for yourself!
-https://codes.iccsafe.org/public/document/IBC2015/chapter-7-fire-and-smoke-protection-features
Thank You for choosing Hilti as your Firestop Experts!
Best Regards,
Raymond Prescott V, Fire Protection Engineering Team
So the answer is yes, there's a room membrane that may require firestopping?
If that is the case then what is the UL detail for it? I need a detail for electrical conduit penetrations.
Great inquiry Johnpaul! We can create an engineering judgement to show you how to firestop a membrane penetration through a rated roof/ceiling assembly by submitting an EJ request form to usfirestopeng@hilti.com.
Follow link to request an engineering judgment:
https://www.hilti.com/content/hilti/W1/US/en/services/fasteners-firestop-strut/firestop-portfolio.html
Best Regards,
Raymond Prescott V, Fire Protection Engineering Team