Recent Comments and Answered Questions on Green Building Advisor

  • Martin Holladay | Nov 20,2017 06:27 AM EST
    Doug, You don't want to install fibrous insulation (like fiberglass) directly against the underside of your steel roofing, since steel roofing regularly gets damp due to condensation. The ...
  • Martin Holladay | Nov 20,2017 06:23 AM EST
    Robert, If I understand correctly, you have a two-flue stone chimney which is damp -- too damp for plaster to stay adhered. The best solution is to install through-chimney flashing somewhere ...
  • Martin Holladay | Nov 20,2017 06:00 AM EST
    Blue Mountain, It can be tricky to make sure that a single-zone forced air system serving a two-story house provides balanced comfort in summer as well as winter, especially if the house has air ...
  • Martin Holladay | Nov 20,2017 05:30 AM EST
    Dantama, Below the box at the bottom of every page -- the box labelled "Answer," where you type your comment -- is an option called "File attachments." Click that option. Then click the "Browse" ...
  • Martin Holladay | Nov 20,2017 05:26 AM EST
    Ryan, Q. "My understanding is that I would not have a vapor barrier at all." A. Foam insulation is a vapor barrier (or more accurately, a low-permeance layer). Three inches of closed-cell ...
  • Martin Holladay | Nov 20,2017 04:55 AM EST
    True, You raise at least two issues: one concerns ventilation, and the other concerns mold prevention. For more on ventilation, you should read the article that Malcolm suggested, in addition ...
  • Malcolm Taylor | Nov 19,2017 11:40 PM EST
    Jeepasaurus, Most people, particularly homeowners building fences, don't make the distinction between the types of PT wood that are available, and don't use ground-contact rated PT when they ...
  • | Nov 19,2017 11:26 PM EST
    Trevor, I too have seen treated 4x4 posts rot. It was a 20-30 year old fence and each post was rotted at the exact same spot. Where the air and ground met. You're formula of "wood+water=rot" ...
  • Malcolm Taylor | Nov 19,2017 11:21 PM EST
    You need a mechanical ventilation system. Our code requires one. http://www.greenbuildingadvisor.com/blogs/dept/musings/designing-good-ventilation-system
  • | Nov 19,2017 10:01 PM EST
    Based on personal experience with past three houses. Sounds like you have a "dampness" barrier on the exterior rather than water proofing. In my current house it looks like the contractor ...
  • | Nov 19,2017 09:58 PM EST
    Sorry, I guess I don't know how to do attachments.
  • | Nov 19,2017 07:57 PM EST
    Hi Martin...Thank you very much...Will check out the links.
  • | Nov 19,2017 07:54 PM EST
    Hey Dana, Thanks for your reply..For some reason the posting system here doesn't seem to allow me to respond directly to your answer with a reply so i'm popping this up as though it an answer to ...
  • Ryan O'Rourke | Nov 19,2017 07:32 PM EST
    I should clarify. On the worst rain storms I did at one point see some dampness on the block wall, but I identified blockages in the gutter pipes which I believe were the cause of this. Once I ...
  • Ryan O'Rourke | Nov 19,2017 07:31 PM EST
    No evidence of water intrusion is correct. I am not fond of adding any thickness to the floor as I am about 6'1" and from the slab to the joists at the shortest part of the basement is already ...
  • Steve Knapp CZ 3A Georgia | Nov 19,2017 07:26 PM EST
    Ryan, There is no evidence of water intrusion, correct? Would you okay with installing rigid foam over the existing slab?
  • Andrew Bater | Nov 19,2017 05:55 PM EST
    An unfamiliar icon popped up on my cellphone today; I clicked on it and lo and behold it was the Airthings Wave unit telling me that the radon level was high on my ground floor: "Air Quality Is ...
  • Steve Lenertz | Nov 19,2017 05:00 PM EST
    Vera, Did you ever find an answer to your question? From what I'm finding in the Lunos literature, the temperature application range is -15C to +40C Steve
  • Steve Knapp CZ 3A Georgia | Nov 19,2017 04:03 PM EST
    Thanks for the additional response. On the Manual J, a qualified third-party can do that for you. He/she will need your construction drawings, window schedule, and a few other details, but it ...
  • Jerry Liebler | Nov 19,2017 03:26 PM EST
    Martin, Thank you!
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