Oak Ridge National Laboratory research shows that “perfectly installed” fiberglass batts lose 11% of their labeled
R-Value, and that “commonly installed” fiberglass batts lose 28% of their labeled R-value.  The article states: “‘R-19’ batts have an R-value of 13.7 when installed as commonly found in actual walls.”   This study confirms tests conducted 20 years ago by fiberglass manufacturers, and reveals the surprisingly large disparity between the labeled R-value and the installed R-value of fiberglass batts.  The point is that R-Value is not the best measure of insulation and that fiberglass is the worst kind of insulation.

Full Document  << click here
(Adobe Acrobat PDF reader needed)                                   <<< click here
Helping the "Building Green" revolution of energy savings for the planet and the pocket.
See U.S. Government "Green Home" building programs.
Cellulose vs. Fiberglass          Spray-applied Polyurethane Foam (SPF)               Attics              Crawl Space            Science Studies    R-Values

Infiltration (air leakage): the killer of insulation   Sources of Air Leaks               Utility Bill savings               Tax Credit        Glossary (coming soon)       Home page
Value Tech Insulation Serves Metro Atlanta
and the Southeast U.S.

Click here to find out what R-value is needed for the different parts of your home        "R-value related to code requirements"