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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Envelope materials with no provided u-values

John Covello

Senior Sustainability Manager

UL Solutions

LEEDuser Premium Member

7 thumbs up

Project location :

January 22, 2015

Hello, On our project we are getting supplied from local contractors materials like sandstone, granite, reused teak wood, and limestone. These materials are going into the floor and ceilings in various places in conditioned spaces. They come with no products sheets from the suppliers and the manufacturers have no U-values for them. I do not see stone mentioned in the Appendix tables for ASHRAE 90.1-2007, unless I am missing it. How would these be modeled in a program like Trace Trane? Also I am getting a request for the u-value of paint for the wall. Is that used in the energy model and how would one determine what that is? Thanks for your help!

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Jean Marais

b.i.g. Bechtold DesignBuilder Expert

LEEDuser Basic Member

581 thumbs up

Thu, 01/22/2015 - 12:12

You have to use the values of assemblies as per App. A. Failing that App. A allows you to calculate the values as per HOF or with a 2D/3D FEM software such as Therm so that the thermal bridging is taken into account. See App. A for details.

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Thu, 01/22/2015 - 21:50

One of the ASHRAE Handbooks contains a pretty comprehensive list of the R/U values of various materials. All stone and all wood are pretty much the same. Make sure you read all of Appendix A and substitute your materials for some of the assumed materials where necessary.

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