Recent Comments and Answered Questions on Green Building Advisor

  • Martin Holladay | Jun 21,2018 12:29 PM EDT
    Bob, Nashville, Tennessee, is in Climate Zone 4. According to recent versions of the International Residential Code, walls in your climate zone are not required to have an interior vapor ...
  • Jon R | Jun 21,2018 11:51 AM EDT
    How big a vent space is needed for moisture removal is an open question and depends on the wetting rate (and roof slope, etc). Generically (all types of roofs), it can vary from 0" to 6+". In ...
  • Jon R | Jun 21,2018 11:04 AM EDT
    >RF radiation as a Type 2B Carcinogen Possible carcinogen. But so is caffeic acid, which occurs in all plants (try eliminating these from your life). And of course they are all highly dose ...
  • Martin Holladay | Jun 21,2018 10:34 AM EDT
    Trevor, I agree. For more on this topic, see "In Praise of Scientists and Scholars." For one person's opinion on Bau Biology, see
  • Trevor Lambert | Jun 21,2018 10:22 AM EDT
    Science is fundamentally just following the evidence. If you reject that, there's not much left to base anything on. In most cases when people malign science, they do so in a pretty selective way; ...
  • Jon R | Jun 21,2018 10:18 AM EDT
    Since you already have hydronic baseboard radiators, I'd look into using a Chiltrix air to water heat pump. Possibly with the addition of a few fan coils (to allow AC and to account for the lower ...
  • Dana Dorsett | Jun 21,2018 08:42 AM EDT
    A load of 23K at positive single-digit outdoor temps for a ~1000' house is excessive, implying a low performance building envelope and lots of low-hanging fruit. The Manual-J is not a test, it ...
  • Martin Holladay | Jun 21,2018 08:24 AM EDT
    Milhouse, If you are heating and cooling a 963-square-foot house in Connecticut with a minisplit, you definitely don't need an oil furnace for a backup. Your heating load will be low, and the ...
  • | Jun 21,2018 08:15 AM EDT
    Oh sorry I forgot to address one thing, ideally I want to use as little oil as possible going forward, if not remove the entire system when possible.
  • | Jun 21,2018 08:13 AM EDT
    Awesome, thank you very much for all this info. I'm definitely going to ask if the energy audit includes the manual j test and if not, find a contractor who can perform the test. I'm also ...
  • Calum Wilde | Jun 21,2018 07:52 AM EDT
    David, I had been wondering why you would prefer a wood burning heating system, the lack of a grid tied option explains it completely. I recently priced a 12kW system for my house in ...
  • Jonathan Blaney | Jun 21,2018 07:04 AM EDT
    Can you tell us your long term goals? Is this your forever home? It will take a long time to recover the cost of these systems. Have you looked into water-to-water systems? I went through a ...
  • Martin Holladay | Jun 21,2018 06:49 AM EDT
    Milhouse, I'm glad you provided more information. The two most important facts are: 1. Your house is quite small. 2. You are planning to perform energy retrofit work. You put the cart ...
  • | Jun 21,2018 06:26 AM EDT
    Hi everyone, thanks so much for the advice so far! I live in Connecticut and right now I have oil heat through baseboard radiators, my house has a full basement (unfinished) and one floor, 963 ...
  • Martin Holladay | Jun 21,2018 04:47 AM EDT
    Milhouse, As the previous commenters have pointed out, there are at least two issues here: 1. The quality of your home's thermal envelope. 2. The accuracy of the Manual J heating load ...
  • Dan C | Jun 20,2018 10:59 PM EDT
    It certainly would help streamline the process of trying to be code compliant.
  • Tim R | Jun 20,2018 10:39 PM EDT
    Perhaps you need to also air seal from the inside. Remove some of the finishes and air seal the SIP to ridge beam from below. Look at Sika Flex 2c they make a polyurethane sealant for concrete ...
  • Peter L | Jun 20,2018 09:52 PM EDT
    MBCI Standing Seam Metal Roof http://www.mbci.com/resource-center/documents/product-catalogs/ They make a high and low clip and the clips lock into the metal purlins. I attached pics of my ...
  • Steve Knapp CZ 3A Georgia | Jun 20,2018 09:42 PM EDT
    Gonzalo, There are sprayable elastic sealants made specifically for the construction industry. One of these products might be an option.
  • Trevor Lambert | Jun 20,2018 09:38 PM EDT
    I looked this in the design stage as well. Like you, we have no grid tie option, so solar was off the table. In the end, I couldn't come anywhere close to justifying the cost premium of this over ...
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