[Equest-users] Building Wall Difference vs. Report Value

[Matthew Higgins]

Depending on your stud spacing and whether it is metal or wood, you will 
notice that eQuest calculated the effective R-Value for all joist/stud 
assemblies. This is different than the Nominal R-Value of 19 in that 
there is thermal depreciation. This is likely the effective R-Value of a 
metal stud wall, correct? U-0.19 translates to an Effective R-5.3, which 
is not unlikely for a metal assembly.

A wider stud spacing with foam insulation and/or an EIFS system will 
likely bring the effective R-Value up where you would presume it should be.

Shocking isn't it?

Matthew Higgins, LEED AP + ASHRAE-HBDP
Building Performance Specialist
Environmental Dynamics, Inc.
Architecture and Sustainability Consulting Services
505.242.2851 xt.103

Any data provided by the Consultant, verbal or written, are to be considered opinions of building energy and/or daylight performance. The Client understands that the Consultant has no control of occupant habits, equipment or material performance or characteristics, site or climate conditions or the Contractor's method of assembly, and that the Consultant's opinions regarding building energy/daylight performance are made on the basis of the Consultant's professional judgment and experience. The Consultant makes no warranty, express or implied, that the energy/daylight performance of the building will not vary from the Consultant's opinion of building energy/daylight performance.

steven rutter wrote:

> I am trying to input a wall as R-19.  However after I run the 
> simulation, I look at the compliance report and it indicates a U-value 
> of 0.19.  What am I missing here? 
> Steven
>
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