Recent Comments and Answered Questions on Green Building Advisor

  • Jameson Taylor | May 21,2018 08:57 AM EDT
    Thanks for the answers. Dana - That link is helpful, I'll definitely spend some time looking into codes for R-values. So it seems that depending on how much insulation is on ...
  • Calum Wilde | May 21,2018 08:03 AM EDT
    The mechanical room needs lots of room to move around and work in. There's going to be at least an HRV/ERVs and water heater in there. Possibly a well pressure tank and water softener. Even ...
  • Martin Holladay | May 21,2018 06:51 AM EDT
    Andy, Looking into the topic more deeply, I realize that demand-control ventilation (using CO2 sensors) is fairly common for commercial systems. There isn't any reason (other than cost) that ...
  • Reid Baldwin | May 21,2018 06:16 AM EDT
    From your elevations, it looks like the North rooms on the second floor would have very low ceilings. Also, if you use trusses for the garage, one of your garage doors will not have a place to go ...
  • Martin Holladay | May 21,2018 05:25 AM EDT
    Max, Either approach will work. Before you commit to the spray foam option, consult a spray foam contractor to make sure that access is adequate. A 2-foot-high crawlspace is rather tight -- you ...
  • Martin Holladay | May 21,2018 05:19 AM EDT
    Stanger, First of all, can you tell us your name? You haven't really described a problem other than high electricity bills. Before we can help, we need to know the answers to the following ...
  • Martin Holladay | May 21,2018 05:15 AM EDT
    Ross, Malcolm seems to understand your question, but I'm not sure I do. The most important question is: Are you planning to install mineral wool batts directly against concrete? If you are, ...
  • Chris B. | May 20,2018 06:11 PM EDT
    Thanks for the input. I can't find anyone around here who still does open cell anyway - they all want to do closed. When I asked AMVIC about it, they responded that I could install any cavity ...
  • Malcolm Taylor | May 20,2018 05:33 PM EDT
    Ross, Yes they will compress fine. You just have to watch you don't tear them pushing them through.
  • Jan Juran | May 20,2018 04:14 PM EDT
    Hi L.T.: according to htts//pvwatts.nrel.gov 500 watts of PV panels in a grid tied system near Tampa FL should generate 782 KwHrs per year, more than enough electricity to run both an efficient ...
  • Calum Wilde | May 20,2018 07:35 AM EDT
    Before you can spec anything else you need to define your wall assemblies and roof assembly so you can predict your insulation and airtightness levels. Will there be insulation under the new ...
  • Martin Holladay | May 20,2018 06:15 AM EDT
    C.D., Every house needs a well-defined thermal boundary. In most homes, the attic is outside of this thermal boundary. If that's the case at your house, you have what is called a vented ...
  • Martin Holladay | May 20,2018 06:09 AM EDT
    Brad, It sounds like you have a big project with a big budget. The decisions you are about to make shouldn't be made by a homeowner working in isolation. Call Paul Eldrenkamp at
  • Martin Holladay | May 20,2018 06:03 AM EDT
    E247, Can you tell us your name? For more information on choosing a type of rigid foam, see this article: Choosing Rigid Foam. In general, green builders avoid the ...
  • Martin Holladay | May 20,2018 05:53 AM EDT
    L.T., The answers so far make sense. It's technically possible, of course, to locate the compressor far from the refrigerator, as is done at most supermarkets. It's also possible to develop a ...
  • Andy Kosick | May 19,2018 10:09 PM EDT
    I realize that their goal is to sell CERVs, but since there are a lot of HRV/ERVs out there that aren't going anywhere anytime soon, the company should package their sensor technology (WIFI and ...
  • Jan Juran | May 19,2018 07:07 PM EDT
    L.T., there are many choices of new refrigerators 18 to 21 CF size which use less than 400 KwHr per annum (measured using the Energy Star protocol) or around $50 of electricity p.a. at typical FPL ...
  • Calum Wilde | May 19,2018 06:47 PM EDT
    James, Martin wrote a bit about his fridge a while ago. IIRC it's several decades old, tiny, and the compressor is on top, I don't remember much else. It was actually a pretty fascinating story ...
  • Malcolm Taylor | May 19,2018 06:27 PM EDT
    More than a decade ago FHB ran an article on someone who made built-in custom refrigerators with the condenser and coils located in a service room behind. I was intrigued enough to talk to the ...
  • Malcolm Taylor | May 19,2018 05:54 PM EDT
    Thanks for the replies. I'd be interested in some thoughts on the non-Zendher systems which use conventional ducting that constitute the vast majority of installations.
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