stc of a wall assembly?

i've searched here, and in various wall assemby books for an STC of a certain wall. No luck. I was hoping someone here may have it in a book that i don't have. the assembly... __________________________________ 5/8" type "x" gyp. bd. __________________________________ 2x6 wood studs @ 16" o.c. 3" sound attenuation fire batt insulation __________________________________ 15/32" osb __________________________________ 5/8" type "x" gyp. bd. __________________________________ let me know if i need to do a pretty picture. lab, test date, and any test data would be good too, but i'm not holding my breath. thanks in advance!!!

Assuming no resilient mounts, approx. STC 43, with 20 dB TL @ 50 hZ; changing stud spacing to 24" improves to STC 45, and adding resilient channel or RSIC clips raises to STC 51 - no change at low end, because this is primarily a function of gap and mass. These are all approximations based on a now unavailable demo of a VERY expensive program... Steve (the demo only allows standard weight household insulation, so the fire batts would improve things in midrange by another dB or two over what I gave)

Thanks. This is for a 4 story hotel. These are shear walls, so the stud spacing needs to stay at 16. With so many walls, I'd prefer to not use RC. I could more easily add thicker insulation, thicker osb, or another layer of gyp. the STC has to be at least 50, or 45 if i field test it. Does your program give TL contours? What is it? What is VERY expensive? Recommend any other software?

The program is a demo of an older version of Marshall-Day's "Insul" calculator - at that time, they had personal and pro versions at approx. $200 and $1000 respectively - since then they've dropped the personal version entirely, updated the pro version and it's around $11-1200. I think they have a stateside rep, the parent company is in NZ, the email I have is [removed] Another possibility - have you downloaded this http://irc.nrc-cnrc.gc.ca/pubs/fulltext/ir761/ir761.pdf the Canadians built and tested 350 different walls just for this project... your exact configuration may be one of them... Steve

Thanks Steve. That pdf is great. I'll check out that demo too.