What’s Worse: Air Leaks or Not Enough Insulation
Cobb would like to know the “tipping point” when a house loses more energy through unwanted air changes with the outside or through a poorly insulated building envelope. His frustration comes with energy modeling software that seems to put an emphasis on R-values while paying too little attention to how tight the building is.
As he explains in a Q&A post at Green Building Advisor, Cobb thinks home buyers have been “brainwashed” into considering R-values alone, while every green builder worth his salt knows that a tight envelope is essential for energy conservation and comfort.
Cobb isn’t alone in thinking that R-values don’t tell the whole story, but there also are critics who think Cobb isn’t taking advantage of what information is already out there.