Wood floors and a 1hour stair wall
Wood floors and a 1hour stair wall
(OP)
Ok, I have a wood frame building used for "light" office. I have two stair towers in the corners of the building that require a 1Hr interior wall, and a floor that does not need to be rated (I am taking the architects word for this). Both the wood frame stairs, and the wood floor will be framing/bearing on the wall. The floors have some decent spans 26' trusses, so the reaction is fairly high for a wood framing.
I typically use CMU or a double wood wall with a gypsum separation wall between. However this building is so small neither are cost effective or practical. I am also not a big fan of trying to get the hanger to bridge over the gap of the 5/8" drywall.
Anybody have a detail, or experience in dealing with this?
I typically use CMU or a double wood wall with a gypsum separation wall between. However this building is so small neither are cost effective or practical. I am also not a big fan of trying to get the hanger to bridge over the gap of the 5/8" drywall.
Anybody have a detail, or experience in dealing with this?






RE: Wood floors and a 1hour stair wall
I have been trying to find a good source of information for you to reference, but in the mean time you should begin with finding out which rated assembly your architect intends to use and try to look up specific information regarding that specific assembly.
For example... http://www.awc.org/Publications/dca/dca3/DCA3.pdf shows a few examples. Most of which are rated to 100% load capacity, but this is not often the case with the UL rated assemblies I have seen.
Just for additional information, how many stories are intended for this project.
RE: Wood floors and a 1hour stair wall
For the firewall joist support, you essentially have two choices:
1. Use hang-over joist hangers with reduced load capacity for the drywall gap.
2. Use fire-retardant treated plywood over the joists and butt the gypsum to the plywood, sealing the joint with fire rated foam or putty.
RE: Wood floors and a 1hour stair wall