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EnerGard's 5.5" and 7.25" walls are respectively 29% and 72% more efficient than conventional walls.

Most people refer to a 2" x 6" conventional wall insulated with fiberglass as being an R-20 system.  The "R" value has been estimated at the point in the wall containing the most insulation, which is NOT a true representation of the home's R-value.

There are a number of accepted methods for determining the effective wall R-value (or RSI) of a given assembly.  The appropriate application for each method is related to the variance in thermal conductivities between the individual components used in the particular parallel component assembly.  


According to ASHRAE¹, the parallel path method should be used when the conductivity of the dissimilar materials in the parallel component construction layer are within the same order of magnitude (as is typically the case with wood-frame walls).  A parallel path method thermal analysis has been conducted for the EnerGard® Wall assembly and sheathing options.  The results are summarized in the table below and are contrasted with the performance associated with a standard stud wall assembly using various sheathing combinations². 

R-Value Explained

Effective Wall R-Value of EnerGard® Wall Systems

WALL SYSTEMS
EnerGard


1.  American Society of Heating Refrigeration and Air-Conditioning Engineers (ASHRAE) Fundamentals Handbook, 2009, Chapter 27: Heat, Air and Moisture Control in Building Assemblies - Examples
​2.  Owens Corning, Code Board Air Barrier System, Product Literature
WALL ASSEMBLYRSI

EFFECTIVE

R-VALUE

% GAIN OVER

2X6 BATT WALL*

  2"x6" Stud Wall, 16" O.C.  2.8416.120%
+7/16" OSB      2.91³16.52
  5.5" EnerGard I-column 16" O.C.3.6820.8029%
+7/16" OSB     
3.7621.35
                +7/16" OSB +1/2" Gypsum   
3.8521.86
  7.5" EnerGard I-column 16" O.C.
4.9027.8272%
+7/16" OSB     
4.9928.33
+7/16" OSB +1/2" Gypsum   
5.0728.78