I honestly dont mind paying, but pay to just have a 10 min conversation of "blah blah blah?

Isn't that what we do though?

Missed the part where it needs to also have a '1 hour separation'. I assume this means a 1 hour fire rating. No idea if it's a fire wall or partition.

its a floor/ceiling

the existing wood floor is a problem if it doesn't have sound board underneath, a sound test would show anything done in the ceiling below as insufficient - the channel and the glue helps a lot, but it's the impact sound that's difficult.

You can also use the UL Design Wizard.

Good luck with that. When I just looked at it I started by identifying floor-ceiling assemblies. Then limited those to wood joist assemblies. Then entered in the hourly rating. Then clicked on the STC rating and "no results found."

Really the UL search only shows one floor-ceiling assembly with an STC rating (STC 60 is the only option available to select) ... and it's using steel joists with concrete floor. https://iq.ulprospector.com/en...

YMMV

Are you using the Product iq that requires a login or the general search?

Didn't see the link. Yup - the OP is screwed. Going to have to use an existing assembly with engineered beams and argue that the the dim lumber has performs better.

Looks like the OP will need to ::gasp:: actually hire an architect to do some calculations and argue their case to the building department! 

Chad, the OP is a regular here and an architect. They posted the following back in Feb 2019 "Im a licensed PM w/ 14yrs of experience at a small 6 person office w/ 85% of our projects being multifamily and strip malls."

Then they should probably know how to figure this out . . . .

All joking aside.  This is going to be a tough assembly to create.  The OP may need to work with the building department to see about using separate assemblies. 

depending on the floor finish and if they can add anything to it, they aren't that far off it seems ... https://www.certainteed.com/resources/techinfo/GypsumCAD_BIM/pdf/GA-FILE-NO-FC-5120.pdf

Dose it have a UL listing?

Yes I am licensed in multiple states and I have never run into this condition. the original building is a 6 plex built in 1964, 4 units up, 2 units down. at some point they gutted a lower unit and used it as a assembly space / multi-purpose / meeting room. flash fwd to June 2021 the owner wants to convert it back to a dwelling unit given no one is gathering as often because of covid, as I explained the exist. floor / ceiling in OP, clearly the existing assembly is not even 1hr rated nor has the min stc of 50, my next move is to argue the existing building code and where we are not reducing the standard but equal or greater that the existing

Ah, so it is a bottom unit with units above still occupied. You can only work on the bottom of the floor. RC channel is definitely not enough. I would go with the spring isolator. Anyway, use the existing code, see if you can get away.

Ah found it. This will satisfy.

These Genie Clips are another option: https://pliteq.com/products/sound-control-clip/genieclip-rst/. Not sure about fire ratings. Call the rep to verify.

Does the OP need a UL listing though?

That can be found in GA-600.

I'm actually glad he does, I would love to have the time and money to test my apartment, I'm pretty sure it doesn't meet code. (I dont have a newer IBC on pdf)

Same reason why a building inspector would care about fire ratings. It's required by local building code.

Maybe because it's a code requirement.

That'll teach me to stay away from multi-family. :P

Yeah, I'm doing a small milti-family project now. Only need 1/2 rated fire partition with an STC of 50 for floors and walls that separate units. Compared to what the OP is dealing with it's easy.

Chad, im used to new construction or demo and remodel, I think this is the first in my career where im fitting up or a converting a 700s.f. assembly space back into a dwelling unit in a small milt-family how it was originally designed.

Are you in the US? I ask because if you're in Canada then the GA assemblies can work. If you're in the US the it's only UL assemblies or a prescriptive assembly.

I was thinking the OP would have to use some type of prescriptive, non UL assembly like that.

the problem with the prescriptive is that stc is typically done by assembly, and not by material

What about hiring an acoustic consultant to write up a report? Give it a little heft?

GA-600

Again - dose the OP need a UL assembly? If so the GA's will not work.

s=r - that's a good point. Also with a prescriptive assembly you have to convince the AHJ to accept what you're proposing.

I was able to convince the AHJs that my calculated method worked, and it saved the client a couple hundred grand.

It can work. All depends on the architect and the AHJ. Sometimes the AHJ will only accept listed assemblies. I've had both success and failures using the prescriptive method.