[Equest-users] U-factor for existing masonry wall

Morteza Kasmai morteza.kasmai at gmail.com
Mon Aug 26 14:02:39 PDT 2013


Hi Byron,

 This is very helpful, thank you very much for your comment.

My Best,
Morteza





On Mon, Aug 26, 2013 at 9:45 AM, Byron Burns <B.Burns at ha-inc.com> wrote:

> Hello Morteza,****
>
> ** **
>
> Here is a catalog of tested wall masonry assemblies, you may be able to
> find most of your assembly in it. I do not guarantee the accuracy of the
> data nor the testing procedures used to obtain it as you will see they did
> not mention the use of any ASTMs. However, it may be helpful calibration
> data if you need to build an isothermal or 2-D model of your wall
> assembly.  ****
>
> ** **
>
> Also ASHRAE  90.1-2007 Section A9 lists the procedures to determine
> assemblies that are not listed in the tables of Appendix A.  Reading
> between the lines a little you can calculate the R-Value for each layer
> using the appropriate calculation method for that type of wall.  For
> example you can use the test data for the exterior CMU wall layers and do a
> parallel path calculation for the continuous insulation and cavity layers,
> sum the results for the assembly R-Value.****
>
> ** **
>
> Hope that helps,****
>
> * *
>
> *Byron D. Burns, EIT, BEMP*
> Energy Analyst/ Modeler
>
> *H&A Architects & Engineers* | www.ha-inc.com
>
>
> ****
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Morteza Kasmai
> *Sent:* Friday, August 23, 2013 2:09 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] U-factor for existing masonry wall****
>
> ** **
>
> Helow 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 Tables “Opaque Building Envelope Constructions”
> requirnment, 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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