What kind of cost savings can we expect if we use 2X6 walls with R-19 (or R-21) insulation?
Mike writes from Plainfield, Illinois: “I’m an Architect designing new homes. I’ve had several clients ask just what kind of energy savings (cost savings) they could expect if we design using 2X6 walls with R19 (or r21) insulation, instead of 2×4 walls with R13 (or R15). Obviously more is better, but many of my clients are looking for a Return on Investment. Also, are there any other studies that show similar increases in attics, basements, etc?” Answer: It is difficult to give someone accurate numbers on payback because there are so many variables that come into play that impact energy savings. With that said, I did a quick analysis with our GEM program (Global Energy Master) and the annual savings for 2,000 square feet of wall area going from R-13 to R 19 is about $85. We know from experience that increasing your attic insulation from R-19 to R-38 can typically pay for itself in about 5 years. I do not have a copy but there was a study done years ago that showed going from no insulat
