UL design number of a demising wall adjoining a shower

[alejandrogarcia@birk]

What's the UL listing of a demising wall that shall have a two-hour fire rating but also adjoins a shower?
Is there a specific UL listing for this type of wall (Cement board+tiling), instead of the two layers of MR boards?

 

[TheCommish]

Build and apply covering per the UL listed wall, then install the shower. I have not seen a 2 hour listed premade shower or tub

 

[Paul Sweet]

Check the cement board manufacturers' websites. They might have a list of rated assemblies.

 

[alejandrogarcia@birk]

I found this in the UL Directory Product IQ. I think this option could work for City's approval.
Link and attachment below in case you need it in the future.
Thanks for the advice.

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iq.ulprospector.com

 

[ICE]

demising wall

A few questions.
1. Is the wall non-bearing?
2. Is an STC rating required?
3. What is the wall separating? ie. condo, apartment, hotel etc.
4. Is there a shower stall on both sides of the wall as is typical in MFR?

 

[alejandrogarcia@birk]

Please see below
1-Non-bearing wall
2-No specific STC rating required
3-It's located between two apartments
4-The shower stall is on one side only

 

[ICE]

The only unknown is where the cement board joins the drywall. The joint compound needs to be compatible with both. Perhaps a 1/4” gap filled with intumescent caulk is a good idea.

 

[alejandrogarcia@birk]

Didn/t think about that. Good point, and advice. Thx