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

[Miller, Nathan]

Timothy,
 
Table of the 10-5A (page 65 of the pdf, nominal page 49 of the code)  of
the Washington State Energy Code (link below) provides a pretty handy
table for realistic U-values for various metal frame constructions. I'm
not sure your local municipality would accept it, but I use these tables
frequently to get U-values for various construction types.  Depending on
your frame spacing, it looks like a U-value of around 0.1.
 
http://www.energy.wsu.edu/documents/code/wsec2006/wsec_2006.pdf
 
Sincerely,
 
Nathan Miller
Stantec- Seattle

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Howe,
Timothy
Sent: Tuesday, February 12, 2008 10:07 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Metal Building R-19 cavity insulation U-factor


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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