Recent Comments and Answered Questions on Green Building Advisor

  • D Dorsett | Jan 21,2017 11:58 AM EST
    Those performance tests are done with at least a 50F temperature difference between the warm & cold sides of the foam. So in an insulating sheathing option with other insulation on the interior, ...
  • Alan B | Jan 21,2017 11:49 AM EST
    Thats very good to know and i will keep it in mind, i am already planning on replacing it, hopefully this year, and i'm not sure what kind of metal it is or how to find out. Its at least 30 years ...
  • Charlie Sullivan | Jan 21,2017 11:47 AM EST
    For the people who are finding this annoying, it seems that if you browse the "recent comments" page the spam rarely shows up, even though it shows up on the "recent comments" box on the home ...
  • Charlie Sullivan | Jan 21,2017 11:46 AM EST
    The fact that you need roof work anyway makes it good timing to consider insulation at the roof. An economically and environmentally preferable way to do that would be with reclaimed foam above ...
  • D Dorsett | Jan 21,2017 11:42 AM EST
    Important information necessary to finding the most optimal solutions is the room by room heating & cooling loads for the upstairs, excluding the portion of the loss attributable to the duct ...
  • Charlie Sullivan | Jan 21,2017 11:38 AM EST
    The CERV and Minotair systems are clever, but they are rarely the most efficient option. If you don't want separate duct systems, I would recommend going ductless with one or the other, perhaps ...
  • Charlie Sullivan | Jan 21,2017 11:31 AM EST
    Adam, the thermal conductivity of EPS varies with temperature too, and in fact it become a better insulator at low temperature. You can see that this plot of thermal conductivity (lower values = ...
  • Reid Baldwin | Jan 21,2017 09:53 AM EST
    Regarding the ductless mini-split option, some people use a centrally located head that does a decent job when the doors are open and electric resistance heaters in the bedrooms for when the doors ...
  • Armando Cobo | Jan 21,2017 09:53 AM EST
    Maybe, manufacturers should provide a chart with REAL temperature R-values that Designers and Builders can rely on... start at 0°F to 100°F in 10°F or 20°F intervals, in that way, folks in AK and ...
  • Reid Baldwin | Jan 21,2017 09:05 AM EST
    Are you regarding scissor trusses as an alternative to 1.5 story, turning it into either single story or two story, or do you have some plan for building a 1.5 story with scissor trusses?
  • Reid Baldwin | Jan 21,2017 08:34 AM EST
    Another device that operates similar to the CERV is the Minotair (http://www.minotair.com/home_en/). Both have ventilation modes in which heat is actively transferred between the incoming ...
  • Adam Liberman | Jan 21,2017 02:34 AM EST
    It seems that despite the problem, the R-value per inch at 25 deg F is still significantly better than EPS. So if I want to maximize the benefit of 2" of rigid non-permiable insulation, and it ...
  • Adam Liberman | Jan 21,2017 01:55 AM EST
    A modern multi-speed blower is likely to be running at low speed much of the time, which reduces the velocity and throw at the registers. So I'm wondering how much we really need to worry about ...
  • Luke Morton | Jan 21,2017 12:20 AM EST
    @ Bill Burke, @ Dana The requirement for Manual J, (or ASHRAE HoF) calcs has been on the books for years. As someone who works on the Peninsula, I've experienced this bit of code (Section 150.0 ...
  • c l | Jan 20,2017 08:56 PM EST
    I too hope something is done. What I don't understand is what the spammers get out of doing this?? Many of these spam posts don't even include links, so it is not like they are trying to get ...
  • Steve Knapp CZ 3A Georgia | Jan 20,2017 07:23 PM EST
    Martin Holladay has an article on CERVs, which might help you to make a more informed ...
  • Paul Minotto | Jan 20,2017 07:19 PM EST
    Thank you Dana. Another option might be totally ductless. Without getting into specifics, just thinking in general terms: A 2500 sq.ft. home in SoCal on one level with a tight envelope - ...
  • Steve Young | Jan 20,2017 05:31 PM EST
    First of all, thank you Steve and John for your response. I have an update. Our roofers still haven't put the roofing underlayment down so I went up and had a look at the tape. It appeared as ...
  • Charlie Sullivan | Jan 20,2017 05:28 PM EST
    If your schedule is flexible enough to accommodate the shipping schedule of the source Brendan posted, that's ideal. Another possibility that might or might not be a good idea is to go to a post ...
  • Adam S | Jan 20,2017 05:08 PM EST
    Thanks, Dana. So if there is NO insulation on the foundation walls for a period of one year or two years, will that be a problem with respect to the building code? Note that my permit is under ...
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