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.
Wind, exhaust fans, and rising hot air can steal your heat, even if you've got a lot of insulation.