Why are the "calculated" and "tested" values for Hy-Fi different?

The "tested" value is for specific dimensions - specifically the air space between the Hy-Fi and foam.  The tested precision is about +/- 10%.  In view of this, the agreement between the calculated and "tested" values are quite good.  Hy-Fi adds R-7.1 to the insulation assembly with a 1.5" air space.

Product Reference: 

HY-Fi

Professionals Reference: 

Builder
Insulation Contractor
Rater

Product Applications Reference: 

Walls
Walls
Walls
Walls
Walls

Building Type Reference: 

Wood Framed

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