Walkable floor.....fire rating

[WARose]

I am looking for some flooring that can meet a 2 hr fire rating. It's got to be fairly thin (maybe 3/4") and it's got to span maybe 2'. (With a Live Load of about 40 psf....or 200 lbs point load.)

Any reccomendations?

 

[KootK]

Isn't it the stuff below your floor framing that needs to be fire rated?

 

[WARose]

For that, I was going to use some spray on stuff.

 

[KootK]

Okay, I get it now. You want the sheathing protected from below. Kinda sounds like you want some gypsum below, then, no?

 

[WARose]

Whatever will work as per my criteria.

 

[dik]

Check pages 25-43 to see if anything applicable... I was curious about fire ratings back on Feb 2, in your earlier posting.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[ChorasDen]

American Wood Council's Design For Code Acceptance 3 (DCA3) would be another good document to reference.

 

[Aesur]

A great place to start is table 721.1(3) in IBC2018 chapter 7.

 

[WARose]

I was referred to this system by an architect: (UL H505)

https://www.usg.com/content/usgcom/en/design-studio/assemblies/assembly-detail.10001.html

One thing I am struggling with is how to attach that gyp board. (I'm not sure about all those "Main Runners, Cross Tees" and so on.) It does say "Suspension System May be Used in Lieu of" [all that stuff].

But what I am wondering is: if I have some metal straps/angles running from the bottom of main (structural) beams on the column line (that the 8" joists frame into)....and the gyp board attaches to that....would that be ok as far as fire rating goes? I ask because it seems here they want it suspended.

 

[RPMG]

In my area, that is non-structural and per the architect, so I would frame the CFS joists into the steel beams and support the structocrete. Then the architect would specify how to hang the ceiling with wires and cross tees. I've used this HL system in that manner.