How do you reconcile continuous insulation requirements with rated assembly requirements?
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The application is multifamily construction. We have energy requirements stipulating continuous R-3 insulation, in addition to required cavity insulation. We also have rated exterior wall assembly requirements.
I have not found any UL or GA assemblies that work, nor have I found any SIS product that has been UL tested.
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Replies
Half inch fire-rated rigid polyiso, mayhaps? What UL test does it need to meet?
U356 and/or U305
UL U356 SIS test reports:
http://sbcri.info/docs/pa/dow/TER_1109_01ULU356_Summary_Fire_Endurance_Assembly_UL_U356_FINAL.pdf?PHPSESSID=lss7ckn9kpdkr3bth121qusit0
http://sbcri.info/docs/pa/dow/TER_1109_01_Dow_SIS_Fire_Endurance_Assemblies_FINAL.pdf?PHPSESSID=lss7ckn9kpdkr3bth121qusit0
I'd be surprised if 1.25" Roxul Comfortboard over OSB or ply wouldn't pass the test, but I didn't find U305 or U356 in a cursory scan. http://www.roxul.com/residential/products/roxul+comfortboard+is
Thanks for the help!