We are building 2-1 hr rated stairways for a commercial project in Raleigh NC (UL 419). The issue we are having is there is not enough space between the stair stringer and metal studs for the 5/8" drywall to pass through for a continuous fire rated assembly. Our plan is to fire caulk where the drywall and stringer meet on both sides of the stringer but we can not get approval to do this until we submit a detail showing this can achieve our 1 hr rating.
Is there a detail that out there I can use? I am open to alternate solutions as well.
Good afternoon,
We can address your applications through an engineering judgment which will be a detail showing your exact application with the firestop components to maintain the stated ratings.
Please see attached for HILTI engineering judgment request form. Please fill out the form and email the completed form with any additional details to usfirestopeng@hilti.com
The typical turnaround time for our engineering judgments is 1-3 business days.
If you have any questions, comments, or concerns please feel free to call or email us.
Thank you for choosing HILTI as your firestop specialist and have a great day.
Regards,
Dakota Reid
Fire Protection Engineer
Hi Cuyler, I'm running into a similar issue. Did Hilti ever provide a detail ?
Thanks for such a fast reply! My email is krista.bennett1@gmail.com if you don't mind sharing. I've submitted an engineering request, but i am sure it will take a few days for Hilti to respond. :)