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Forum discussion

CS-2009 EAp2:Minimum Energy Performance

U-factor for existing masonry wall

Morteza Kasmaei

Principal

Climatic Design Inc.

LEEDuser Basic Member

18 thumbs up

August 23, 2013

Hello All In this LEED_CS project, the existing masonry wall was changed to the following configuration (from outside to inside): - glass-fiber-reinforced concrete panels [TAKTL] on galvanized steel furring channels - existing 8" masonry wall - 3" polyisocyanurate insulation (R-18) - 1/2" air space - 3-5/8" metal studs without thermal insulation - 5/8" gypsum wall board Per ASHRAE 1.4.1 Tables “Opaque Building Envelope Constructions” requirement, proposed construction assembly U-factor should be as-designed and consistent with Appendix A of ASHRAE 90.1. I cant fined any table in Appendix A to match this configuration. How should I select the U-factor for this wall? Thank you so much for your help, Morteza

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Fri, 08/23/2013 - 19:42

Find the closest one and extrapolate. Be sure to read the text as the tables include assumptions about the construction. There is a table for block walls with steel framing and continuous insulation. Compare the assumed exterior finish to the one you have to see if there needs to be an adjustment.

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