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How do you reconcile continuous insulation requirements with rated assembly requirements?

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.

Asked by david nofsinger
Posted Nov 27, 2012 9:59 AM ET
Edited Nov 27, 2012 11:02 AM ET

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4 Answers

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1.

Half inch fire-rated rigid polyiso, mayhaps? What UL test does it need to meet?

Answered by Dana Dorsett
Posted Nov 27, 2012 3:02 PM ET

2.

U356 and/or U305

Answered by david nofsinger
Posted Nov 27, 2012 4:22 PM ET

3.

UL U356 SIS test reports:

http://sbcri.info/docs/pa/dow/TER_1109_01ULU356_Summary_Fire_Endurance_A...

http://sbcri.info/docs/pa/dow/TER_1109_01_Dow_SIS_Fire_Endurance_Assembl...

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

Answered by Dana Dorsett
Posted Nov 27, 2012 4:56 PM ET

4.

Thanks for the help!

Answered by david nofsinger
Posted Nov 27, 2012 5:01 PM ET

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