Recent Comments and Answered Questions on Green Building Advisor

  • Martin Holladay | Nov 20,2017 01:11 PM EST
    Dan, I haven't heard of any summertime moisture problems arising from the use of interior rigid foam. As far as I know, interior rigid foam is safe. For more information on this issue, see
  • Jon R | Nov 20,2017 12:58 PM EST
    RO cost me $200 to purchase plus $2/year in extra water usage - which I find minimal and more cost effective/convenient than drinking bottled water (much of which is produced by RO anyway). Not ...
  • | Nov 20,2017 12:44 PM EST
    Martin, Thanks for increasing my work load with ceiling drywall. Fortunately that project will wait till spring. As a follow-up to cut & cobbling my wall cavities to eliminate moisture on ...
  • Christopher Welles | Nov 20,2017 12:21 PM EST
    Do the windows have an i89 LowE interior coating, what Andersen calls "Heatlock"? That reduces condensation resistance pretty significantly. I don't know if Andersen publishes Condensation ...
  • David Meyer | Nov 20,2017 12:21 PM EST
    FYI, that AHRI website database is rough for searching. Get a cup of coffee and a stack of patience before you go digging in there. Just an FYI.
  • David Meyer | Nov 20,2017 12:17 PM EST
    I will be using these for my rigid foam installation. http://www.rapidmaterials.com/Rodenhouse-Plasti-Gripreg-PMF-Plastic-Masonry-Fastener-200-250pcs_p_1936.html I should be installing the ...
  • Martin Holladay | Nov 20,2017 11:45 AM EST
    Levab, Dana has given you good advice. The first step is always to perform a load calculation. For more information on load calculations, see these articles: How to ...
  • | Nov 20,2017 11:31 AM EST
    @ Martin, thanks for explaining the Low-e. However I don't know if my windows or skylights have it. And whether they do or don't - I still need to choose a Ductless Heat Pump - any advice on that?
  • Malcolm Taylor | Nov 20,2017 11:29 AM EST
    Gregg, However laudable your aim, you are still missing Martin's point: Unless you are sourcing your materials locally, and the materials do not need petroleum to be manufactured, you may be ...
  • John Clark | Nov 20,2017 10:50 AM EST
    I've always been of the opinion that agriculture and animal husbandry are a bigger threat to humans than GHG/climate change. Municipal water systems overall do a good job since testing ...
  • Martin Holladay | Nov 20,2017 10:35 AM EST
    Mark, I don't see any downside to installing polyethylene, as long as you make sure that the interface between the polyethylene and the carpeting doesn't squeak when you walk on it. Ideally, ...
  • Martin Holladay | Nov 20,2017 10:30 AM EST
    Andrew, Here is a link to an article that discusses ways to insulate floors that are exposed on the underside to outdoor conditions:
  • Steve Knapp CZ 3A Georgia | Nov 20,2017 10:29 AM EST
    Panasonic makes great bath fans. Have you contacted technical support to see if any of the models can be configured to operate in the way you want? That said, the newer Panasonic fans have very ...
  • Martin Holladay | Nov 20,2017 10:24 AM EST
    Jon, I'm not sure that I understand your recommendation. Are you recommending that every American residence, whether rural or urban, whether hooked up to a municipal system, a drilled well, or a ...
  • | Nov 20,2017 10:21 AM EST
    My concern goes beyond the lead paint. For that I would reside with cedar. I am fond of old houses and grew up in one. That house was not balloon framed but was stone - 48" thick at the ...
  • Jon R | Nov 20,2017 10:10 AM EST
    I like the point about hydro being a valuable battery replacement that should be used only when other renewable sources are unavailable. The lack of accounting for carbon and other pollutants ...
  • Andrew Southam | Nov 20,2017 09:58 AM EST
    Q: How deep are the rafters? A: I'm using 2x8 rafters. Though, I was hoping to avoid any fiber insulation below the closed cell spray foam. This will be a completely new build, so I have all ...
  • Jon R | Nov 20,2017 09:49 AM EST
    I'm not sure what this means, but I tell people that a test done today doesn't guarantee much about tomorrow. Annual testing might mean drinking who knows what for a year. And current tests do ...
  • Martin Holladay | Nov 20,2017 09:46 AM EST
    B.L., First, we need a better description of what exists. There are four issues which are unclear. 1. You wrote, "I have a vapor barrier" and "vapor barrier is up on walls." What does that ...
  • Martin Holladay | Nov 20,2017 09:36 AM EST
    Birdie, Kevin's suggestion to check the weep holes is a good one. They are often clogged by dirt or vegetable matter. Another important point is that any exterior door should be protected by a ...
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