Fire Rating

[Alavalle]

Does a 3hr fire-rated wood floor/ceiling assembly exist? I have been looking at all the UL designs and I haven't found anything but 2hr rated. I am trying to keep it wood to not have to use metal. Something such as wood trusses for floor or ceiling is what I'm looking to use.

 

[concretemasonry]

Check with the truss manufacturers to see what information they have available. UL is not the God of fire resistance, but the manufacturers may have many assemblies that have been tested and rated by companies that do not want to deal with the fees, bureaucracy and time involved to get a certification. Insurance companies like UL, but a good test or approval from a certified lab should be accepted by a code official.

Dick

 

[MiketheEngineer]

Lots of layers of drywall??

 

[Alavalle]

Yep, I guess it could also do that too. Now I need to know which floor/ceiling truss system I will use. This is all for a new aparment complex. And a lot of drywall layers might be that path toward achieving the rating but may not work for the ceiling height clearance. I imagine the trusses are going to get beefy with 100psf LL + DL and long spans. Thanks for the advice.