Recent Comments and Answered Questions on Green Building Advisor

  • Martin Holladay | Jan 23,2018 02:36 PM EST
    Calling Malcolm Taylor...
  • Rachel Wagner | Jan 23,2018 02:27 PM EST
    Thank your for sharing your process on GBA. The mineral wool insulation layer and air barrier look good to me. I, too, was sad to see the welded wire mesh sitting directly on the air barrier, not ...
  • Andrew Bater | Jan 23,2018 02:17 PM EST
    H&H, it might make sense to purchase some real time instrumentation.   I have found it to be incredibly instructive as to when levels are high or not.  You may well find, as I have, that making ...
  • Jon R | Jan 23,2018 02:15 PM EST
    Measuring under-plastic pressures at multiple points will tell you if you need to improve under-plastic distribution (more pipes, gravel, etc).
  • Michael Maines | Jan 23,2018 02:09 PM EST
    Craig, didn't we have a whole discussion about this before you started? It's very common to add exterior extension jambs and sill extensions when doing exterior insulation. You should be able to ...
  • Michael Maines | Jan 23,2018 02:05 PM EST
    Hotandhumid, it's hard to fully visualize your situation but it seems unlikely that radon is entering through the walls or the raised patio area. There are various ways to run the radon pipes, but ...
  • Martin Holladay | Jan 23,2018 02:01 PM EST
    Michael, I have no opinion. I've never seen this product. I guess it's fiberglass -- like a boat or a bathtub. With new products like this, I'd be inclined to wait 10 years and let someone ...
  • Jon R | Jan 23,2018 01:58 PM EST
    Partially blocking some ducts/registers is a requirement to getting a well balanced system (ie, every room is the same pressure and temperature).
  • | Jan 23,2018 01:57 PM EST
    Martin and Dana, thanks for the information. Martin your analysis is correct, a standard 2 x 4 framed house with brick veneer. Dana, 3 sides of the basement below grade with standard exposure ...
  • Jon R | Jan 23,2018 01:49 PM EST
    Don't let them guess about the crawlspace vs interior and under-plastic vs crawlspace pressures - measure both, with and without the HVAC running. A very slightly negative house pressure in the ...
  • | Jan 23,2018 01:26 PM EST
    Thank you everyone. We tested at the lowest living level ( living room), not the crawl space. We don't know what to do-being told my mitigator they've done everything. The crawl space is ...
  • Michael Maines | Jan 23,2018 12:32 PM EST
    Jeff, you're right about air changes, it does have a significant impact. I use 7 ACH50 when I don't know existing conditions, but it depends a lot on local practices. I usually model the energy ...
  • Rob Myers | Jan 23,2018 12:25 PM EST
    I have suggested this in a previous thread - one option is to use dust collection system blast gates. They are readily available up to 6" in diameter (there may be larger ones available) , they ...
  • Michael Maines | Jan 23,2018 11:43 AM EST
    Jerry, I-joists are not made to be top-bearing trusses. The glue used to connect the web to the flanges is extremely strong, but not designed for the high localized stresses of a top-bearing ...
  • | Jan 23,2018 11:37 AM EST
    I'm glad we are on the same page Malcolm. My name is Brandon.
  • Malcolm Taylor | Jan 23,2018 11:31 AM EST
    Jerry, Those I joists are just to create a service cavity aren't they, and will be fastened to the trusses above? If so i doubt it matters how they are fastened at the perimeter. That is a pretty ...
  • Michael Maines | Jan 23,2018 11:30 AM EST
    Dana, I'm disappointed that you would downplay the risks of radon exposure. It's true that it's not possible to be perfectly accurate when assessing risk, any more than climate change scientists ...
  • Malcolm Taylor | Jan 23,2018 11:28 AM EST
    User 992etc, "The trusses can bear on the inner half of the top plate with the header on the outer half when needed." This is what caused my confusion. It implies that the trusses are all ...
  • J M | Jan 23,2018 10:25 AM EST
    Got this feedback about the current commercialized VIG windows: "Like Pilkington/NSG, both Guardian and Panasonic are built using brittle solderglass seals. These will have a tough time in ...
  • Dana Dorsett | Jan 23,2018 09:25 AM EST
    If there is a lot of above-grade exposed foundation in that basement there can be an eventual payoff on energy costs too (think decades, not years), but a lot depends on the quality and expense of ...
Register for a free account and join the conversation


Get a free account and join the conversation!
Become a GBA PRO!