[Bldg-sim] Metal Building R-19 cavity insulation U-factor

[Howe, Timothy]

I have a metal building wall construction with R-19 insulation between
the girts.
 
Now in ASHRAE 90.1-2004 Appendix A, Table A3.2 the single layer of
mineral fiber only goes up to R-13.
 
Any suggestion on how to determine the U-Factor for this wall?
 
Thanks.
 
Tim.
 
 
 
Timothy Howe
Mechanical Engineer
Stantec

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