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

[JRR]

Jrr wrote;

Steel studs without Styrofoam sheathing is a loosing design choice. Period.
The XPS sheathing should be 1"  or   1.5" ;    3/4 inch is not enough.

Energy 10  will calculate the effective R values in a handy format. So 
will  TREAT.

Kevin Kyte wrote:

>This may help.
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>http://www.maconline.org/designalert.PDF
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>Kevin Kyte, LEED AP
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>RobsonWoese, Inc.
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>(T) 716-636-1800
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>(F) 716-636-1856
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> <http://robsonwoese.com/index.php> http://robsonwoese.com
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>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 1:07 PM
>To: bldg-sim at lists.onebuilding.org
>Subject: [Bldg-sim] Metal Building R-19 cavity insulation U-factor
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>I have a metal building wall construction with R-19 insulation between the
>girts.
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>Now in ASHRAE 90.1-2004 Appendix A, Table A3.2 the single layer of mineral
>fiber only goes up to R-13.
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>Any suggestion on how to determine the U-Factor for this wall?
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>Thanks.
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>Tim.
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>Timothy Howe
>Mechanical Engineer
>Stantec
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