Is a thin layer of rigid foam better or worse than nothing?
I am building near Madison, WI. Our house plan has walls that consist of (outside-in): Cedar or Hardieplank, tyvek, 7/16 OSB, 16" on center-studs, R23 bib insulation, 6 mil vapor barrier, drywall. My question is whether 0.5" of rigid foam insulation added to the exterior, inside the Tyvek will do more harm than good. I gather it will reduce thermal bridging, but it is too thin and may lead to moisture problems. I know 1.5 to 2" of rigid foam is the correct thickness. So the question is, should I just ditch the foam?
Thanks in advance.
Posted May 6, 2012 11:27 PM ET
Other Questions in Energy efficiency and durability
I have a half vault ceiling with 3 vertical skylights at the peaks. It was condensating alot so we had the blown insulation stuffed between in between the ceiling joists from soffit. There is no ridge vent as its cut off at the windows. Even after replaci
I live in an 1890 Victorian in Southern Pennsylvania, heated by oil. While I love radiators, I hate using fossil fuels! Is there a way to use green technology to use less oil? My methods to date have been uncomfortable - installing a wood stove,