Fire Enclosure Method at Stair Underside

[Mitch]

I am designing a building where the staircase is required to be enclosed with 2-hour fire-rated construction. I would like to utilize the space underneath the stairs in the cellar. How can I enclose the stairs from the underside? Is the only option a horizontal ceiling membrane such as UL design I516? Is there an approved fire-rated assembly that can be installed at an angle directly applied to the stairs/stringers?

 

[TheCommish]

looks like a sloped ceiling to me use a rated listed ceiling design

 

[Jay Smith]

Maybe this would do it.

 

[JPohling]

shaft wall construction