Recent Comments and Answered Questions on Green Building Advisor

  • Brendan Albano | Apr 25,2017 03:46 PM EDT
    If you're using outie windows and rigid foam, it makes sense to me locate your WRB on the outside of your rigid foam. Then everything is all lined up. Assuming you want to use housewrap (as ...
  • Martin Holladay | Apr 25,2017 03:15 PM EDT
    Inger, Q. "So no harm will befall my OSB sheathing if I put 1-inch rigid foam directly against it and then apply the housewrap over the rigid foam?" A. No, as long as your flashing and water ...
  • Martin Holladay | Apr 25,2017 03:11 PM EDT
    Todd, Q. "Would polyiso foil faced boards be an option if the seams were well taped or foamed?" A. Yes. If possible, the insulation layer should be continuous -- so that the ceiling insulation ...
  • Inger Peters | Apr 25,2017 03:04 PM EDT
    So no harm will befall my osb sheathing if I put 1" rigid foam directly against it and then apply the house wrap over the rigid foam? I am planning outie windows so it would just require normal ...
  • Nick Welch | Apr 25,2017 02:52 PM EDT
    Martin, your excitement is contagious and is key to the quality and quantity of information you put out for everyone to learn from. Thanks for doing what you do!
  • Dana Dorsett | Apr 25,2017 02:22 PM EDT
    "Polyiso is an unfaithful friend in the winter. " How so? At zone 4 marine wintertime outdoor temperatures polyiso doesn't have to be derated at all if it's the entire insulation layer in a ...
  • Mark Walker | Apr 25,2017 01:20 PM EDT
    Great info. Thank you. Notes: ACME and Premier are proud of their nailbase. Polyiso is an unfaithful friend in the winter. For flashing the window heads, I might just integrate some tyvek ...
  • stephen sheehy | Apr 25,2017 12:55 PM EDT
    I looked at my pocket doors ( with Johnson hardware) and I don't think you'll get much airflow around the doors when closed. The only unimpeded path is underneath.
  • Martin Holladay | Apr 25,2017 12:33 PM EDT
    Mark, Q. "Is Zip + tape suitable under the EPS or should there be some Tyvek too?" A. Zip sheathing, installed according to the manufacturer's instructions, is a water-resistive barrier. You ...
  • Ethan T ; Climate Zone 5A ; ~6000HDD | Apr 25,2017 12:31 PM EDT
    Michael and Martin, thank you, respectively, for your detailed replies. It is fortuitous for me that this conversation came about just as I am deeply embedded in a cost estimating exercise ...
  • Dana Dorsett | Apr 25,2017 11:37 AM EDT
    You can burn a 2000' 2x6/R22 + 1.5" polyiso overcoat house to the ground and it still might not hit the same greenhouse gas emissions of setting 790 gallons of gasoline on fire. (Think of a 3 x 5 ...
  • Malcolm Taylor | Apr 25,2017 11:20 AM EDT
    People buy houses for a variety of reasons. However I can't see (nor have I ever experienced) a buyer passing up a well performing house because it didn't include provision for switching energy ...
  • stephen sheehy | Apr 25,2017 11:13 AM EDT
    Just my opinion, but I think it makes no sense to spend money installing features you don't want, because some future buyer might want them. If it makes sense to use minisplits for heat and AC, ...
  • Brendan Albano | Apr 25,2017 10:31 AM EDT
    Lance, if you're interested in doing some back-of-the-envelope calculations, the "Inventory of Carbon and Energy" is a decent resource for finding the embodied energy and embodied carbon of common ...
  • Charlie Sullivan | Apr 25,2017 10:06 AM EDT
    Lance, you ask, " What I'd be interested in knowing is how much gasoline are we setting on fire when building a 2000 sqft code-built home using 5.5" R22 fiberglass and 1.5" of rigid foam ...
  • Martin Holladay | Apr 25,2017 09:58 AM EDT
    Dean, Yes. That approach is listed in one of the articles I linked to, How to Build an Insulated Cathedral Ceiling. -- Martin Holladay
  • Dean Tyler | Apr 25,2017 09:46 AM EDT
    Thanks for the information. Is it feasible to have combine the plans to use rafter vents, cellulose and 2" thermax to hold the cellulose up? -Dean
  • Lance Peters | Apr 25,2017 09:32 AM EDT
    I completely understand your point. What I'd be interested in knowing is how much gasoline are we setting on fire when building a 2000 sqft code-built home using 5.5" R22 fiberglass and 1.5" of ...
  • John Clark | Apr 25,2017 09:32 AM EDT
    Agree with Anon. Gas hookups will expand your pool of potential buyers especially if they don't want the PV array on the roof.
  • John Clark | Apr 25,2017 09:25 AM EDT
    self supporting will the weight of the loose fill fiberglass eventually cause it to tear at the penetrations or will it stretch?
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