Recent Comments and Answered Questions on Green Building Advisor

  • | Feb 19,2018 12:03 PM EST
    Jon R, good points. Though if I get down to 24" and still have soft soil, I'll likely reach the end of my patience and pour a footing anyway. I replaced a bunch of subfloor when I remodeled the ...
  • Dana Dorsett | Feb 19,2018 12:00 PM EST
    A couple of comments: Installing an oil-fired furnace or boiler without a properly sized stainless flue liner is a code violation in some states. It's more than just a good idea- it's the law ...
  • Joseph McGrail | Feb 19,2018 11:50 AM EST
    Thanks for the replies everyone. Our first floor is just above the 100 year level, so while we're hoping to not have to deal with it we're trying to plan as if we will. Unfortunately with what has ...
  • Dana Dorsett | Feb 19,2018 11:25 AM EST
    Don't use interior side Thermax below the anticipated high water mark, as it will wick moisture and take years / decades / forever to dry. EPS will temporarily take on some amount of moisture in ...
  • Dana Dorsett | Feb 19,2018 11:21 AM EST
    Stopping R10 exterior foam at 4' below below the slab, or 4' below grade is good enough where the slab is at or near grade. On taller walls that are more than 2' below grade, bring it 2' feet ...
  • Jon R | Feb 19,2018 11:10 AM EST
    > For the footings, they need to be deep. Seems to me that you need to keep digging until you get to undisturbed soil and then measure the bearing capacity. You can't pre-determine a depth or ...
  • Jonathan Blaney | Feb 19,2018 10:18 AM EST
    Have you checked to see if the joists are bowed? Jacking up the middle of a bowed joist will not make it flat. You are planning a lot of work in a small space. I had a bad floor system over a ...
  • | Feb 19,2018 09:49 AM EST
    T Carlson, all of the tables I've seen are based off of end walls with one main beam. I didn't think those applied, so I've tried to do the real math. I'm not an engineer, but I do have an ...
  • Mike McLaine | Feb 19,2018 09:34 AM EST
    #3 Walter: I had the same though re: approaching the installer (who happens to also have my oil and service contract last few years). I think your point about interior vs exterior is good, my wife ...
  • Jeremy Archer | Feb 19,2018 09:30 AM EST
    @T Carlson I live in southern Ontario, a couple hundred km east of Toronto. Climate zone 6, though i think it is the warm edge. Last winter (our first in the house) we didnt use the ...
  • Reid Baldwin | Feb 19,2018 08:21 AM EST
    There are at least three aspects of selecting a furnace: brand, features, and size. Regarding features, my prioritized list would be condensing (first digit of efficiency is 9), ECM-type blower ...
  • Justin Brown | Feb 19,2018 07:25 AM EST
    I have mounted the 20 3” thermax to the basement walls. I have taped all the seams where the boards meet. I will run a bead of spray foam at bottom of boards and tops to airseal. Should I ...
  • Martin Holladay | Feb 19,2018 07:23 AM EST
    Andy, It's possible to design a "magic box" that provides space heating, cooling, ventilation, and even domestic hot water. Several companies have worked on developing such a device, and a few ...
  • Martin Holladay | Feb 19,2018 07:12 AM EST
    Jim, Below is a link to an article on installing exterior rigid foam. While the article assumes that the house has wood framing and OSB or plywood sheathing, the steps are similar for a concrete ...
  • Martin Holladay | Feb 19,2018 07:03 AM EST
    Joseph, If you have determined that there is a high likelihood that water will rise above your first floor during a flooding event, then it doesn't make much sense to invest in any remedy other ...
  • Martin Holladay | Feb 19,2018 06:58 AM EST
    Vissu, Step one to designing a heating system -- or specifying a furnace -- is to perform a heating load calculation. Here are links to articles you should read: Who Can ...
  • Martin Holladay | Feb 19,2018 06:56 AM EST
    Kevin, You have posted this question twice. The answers to your questions appeared on your other posting. Here is the ...
  • Martin Holladay | Feb 19,2018 06:51 AM EST
    Alex, The answers: 1. Yes, exterior rigid foam will help. 2. Thick foam is better than thin foam, but even 1 inch of rigid foam will reduce the chance of interior condensation. 3. I would ...
  • Martin Holladay | Feb 19,2018 06:45 AM EST
    Jake, I'm sorry that my response was short. I wish you the best of luck. I'm a big believer in solving ice dam problems by installing exterior foam, and I know that homeowners have to wait for ...
  • Martin Holladay | Feb 19,2018 06:42 AM EST
    Mike, Walter is right. The standard solution is to line your flue with a stainless-steel liner. When it comes to air sealing, it isn't rocket science -- just ordinary crack-sealing. Buy some ...
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