Recent Comments and Answered Questions on Green Building Advisor

  • Martin Holladay | Jun 21,2018 08:00 PM EDT
    Andy, Jon suggested we invoke the precautionary principle, and I agree that a valid argument can be made in favor of the precautionary principle. I mentioned the precautionary principle in my ...
  • Andy Chappell-Dick | Jun 21,2018 07:38 PM EDT
    Jon R. asks a great question (comment #21), and I hope earlier commenters weigh in on how to respond to data that is limited. We all agree that junk science is a despicable scam, and hope that it ...
  • Martin Holladay | Jun 21,2018 05:55 PM EDT
    Zane, Your question is addressed in an article titled "To Install Stucco Right, Include an Air Gap." In that article, I wrote: "If you’re installing stucco over ...
  • Bob Harshman | Jun 21,2018 05:54 PM EDT
    You guys are AwESoME! Thanks for the Responses! Dana - I did my best at air sealing I did not tape the seams but -> the top and bottom plates were sealed as well as l the studs I deemed ...
  • Peter L | Jun 21,2018 05:51 PM EDT
    Zane, To be honest, conventional 3 coat stucco systems will crack over time. No way to stop conventional concrete cement systems like that from cracking as they are put on thin, they absorb ...
  • Dana Dorsett | Jun 21,2018 04:00 PM EDT
    At the high cost of rigid rock wool, if it's not possible to drop back to 2x4 framing at this point you can probably still thermally break the framing with interior Bonfiglioni strips with 1-1.5" ...
  • Dana Dorsett | Jun 21,2018 03:55 PM EDT
    At 2" most closed cell foam is still north of 0.5 perms, a class-II vapor retarder that WILL still allow drying toward the interior. You don't have any vapor retarders on the exterior, so it can ...
  • | Jun 21,2018 03:38 PM EDT
    Thank you! I will get reading!
  • Martin Holladay | Jun 21,2018 03:35 PM EDT
    Judy, You can install a continuous layer of mineral wool insulation on the exterior side of your wall sheathing if you want. Here are links to articles that describe this approach:
  • Phil Boutelle | Jun 21,2018 03:33 PM EDT
    This article was in the June 2018 edition of the ASHRAE Journal (subscribers only, but here is a link if you subscribe https://technologyportal.ashrae.org/Journal/ArticleDetail/1981): This ...
  • Dana Dorsett | Jun 21,2018 03:29 PM EDT
    ...putting in perspective, how many beer refrigerators does that one marijuana plant displace? :-) With the kind of money going into this industry the problem will be solved, but it's an ...
  • Dana Dorsett | Jun 21,2018 02:40 PM EDT
    I suppose it's not too late (and still worth it) to caulk the seams of the doubled-up framing and the bottom plates to the sub-floor. (sigh)
  • Martin Holladay | Jun 21,2018 02:32 PM EDT
    Dana, Your advice comes too late. See the photo posted with the original question -- all the Thermo-Ply has already been covered by fiberglass insulation. Thermo-Ply has a vapor permeance of ...
  • Dana Dorsett | Jun 21,2018 02:22 PM EDT
    Yes, foil faced sheathing is a vapor barrier, and that will protect the wall assembly from taking on moisture from the brick. Buy a few rolls of high quality temperature rated foil tape (eg ...
  • Bob Harshman | Jun 21,2018 02:16 PM EDT
    See continuous baffles - they were a pain to install! Picture is before they were sealed up to the ridge.
  • Dana Dorsett | Jun 21,2018 02:13 PM EDT
    Apparently you have a heating history on the place with the oil burner(?). If you have some mid to late winter fill-ups and quantities (with exact dates) and a ZIP code it's possible to use the ...
  • Bob Harshman | Jun 21,2018 02:11 PM EDT
    Martin - Thanks for the Response! This is what the insulation company said -> that it will pass codes... my question is will it behoove me to install a smart vapor retarder or will it be OK as ...
  • Dana Dorsett | Jun 21,2018 01:59 PM EDT
    This isn't a visceral response, this is just calling it what it is- BS served up in a pseudoscience wrapper. Making up stuff (or stating without citation) that line voltage noise in that ...
  • Ryan Magladry Ottawa, Ontario | Jun 21,2018 01:39 PM EDT
    just to give some perspective. the heat load for my new build, 2000 sq ft single level, well insulated, air tight with good windows, and full conditioned basement came in at 22,500btu/hr, in ...
  • Peter L | Jun 21,2018 12:35 PM EDT
    I have the Ultimate Air ERV and yesterday I ran it during the day: 98F outdoor temp 74F indoor temp 80F fresh air discharge It's pretty efficient judging by the above results. My indoor ...
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