Recent Comments and Answered Questions on Green Building Advisor

  • Michael Maines | Apr 22,2018 10:32 AM EDT
    Mai Tai, there is a good chance your 24" floor trusses can span 30' without failing; they will just be bouncy until you install the center support. But it depends entirely on the truss design, so ...
  • Michael Maines | Apr 22,2018 10:20 AM EDT
    Lance, is there a reason you can't add brackets below the roof? We hit 0.25 ACH50 on this house, even building over an existing foundation and using some double-hung windows at the owner's insistence.
  • Robert Opaluch | Apr 22,2018 10:17 AM EDT
    I framed my passive solar house and shingled the roof before pouring the slab on grade inside the frost walls. Mostly because of lack of money. So the framing wouldn't be as exposed to the ...
  • stephen sheehy | Apr 22,2018 09:22 AM EDT
    We opted for a heat pump dryer primarily to avoid the wall penetration for the vent. But the dryer works fine.
  • Lance Peters | Apr 22,2018 09:09 AM EDT
    Martin, I agree that should make sense, but I’m a “special” customer with specific requirements. His original proposal included attachment points inside the wall, which would have made for an ...
  • Michael Maines | Apr 22,2018 09:04 AM EDT
    Lance, "brow roof" is a fine term, but if you're interested, the proper term is pent roof. In case it helps you visualize things, bending moment is essentially the same as torque. (Torque is ...
  • | Apr 22,2018 08:55 AM EDT
    Dana I was not aware of the site you posted which would have made the data more reliable. To get the billing cycling to degree days to match, since it was weekly data I divided it by 7 which ...
  • T Carlson | Apr 22,2018 08:05 AM EDT
    Ha, thats makes a little more sense than crawling around in a crawlspace but in light of my stupidity, and the fact their is bearing midspan, you could frame the midspan wall on layers of treated ...
  • Martin Holladay | Apr 22,2018 07:59 AM EDT
    Mai Tai, There are lots of ways to delay curing of a slab (thereby improving the concrete strength), ranging from polyethylene to damp burlap to hay to using a sprinkler to applying a ...
  • Mai Tai | Apr 22,2018 07:49 AM EDT
    There is a supporting frost wall in the middle of the span to take the loads. Thanks for the confirmation, looks like I will be looking for a 4 day no rain window to install poly/foam/tubing and ...
  • Martin Holladay | Apr 22,2018 06:30 AM EDT
    Ross, If you can see perforations, this product is probably a product usually described as a "perforated radiant barrier." The perforations are supposed to increase the vapor permeance of the ...
  • Martin Holladay | Apr 22,2018 06:20 AM EDT
    Irene, If the wall in question faces a crawl space that is protected by a porch roof, then I assume the wall is never rained on. Under the circumstances, what you are worried about are air ...
  • Martin Holladay | Apr 22,2018 06:16 AM EDT
    Jon, Most HRVs have more than one grille from which the HRV pulls stale air, and I presume that your HRV system will be drawing stale air from two or more bathrooms, and perhaps from a laundry ...
  • Martin Holladay | Apr 22,2018 06:11 AM EDT
    Tyler, GBA has published several articles on heat-pump clothes dryers, including these two: Energy-Saving Clothes Dryers Hit U.S. Markets
  • Martin Holladay | Apr 22,2018 06:05 AM EDT
    T. Carlson, The way I read the question, Mai Tai is talking about a slab on grade, not a crawl space slab. Mai Tai, In light of the need for a bearing wall in the middle of the house, I agree ...
  • Martin Holladay | Apr 22,2018 06:00 AM EDT
    Lance, The reason that a designer or builder hires an engineer is to help with the details. If the engineer is working for you, ask the engineer to draw the necessary details for the roof design ...
  • Lance Peters | Apr 22,2018 02:53 AM EDT
    Just to be clear, this is what I'm referring to as a "brow roof", the roof that shades the first floor windows:
  • T Carlson | Apr 21,2018 11:19 PM EDT
    I wouldnt even think about not pouring the crawl slab before building, for all sorts of reasons. And I hope you're thickening the slab under your midspan wall. Crawl slab doesnt need to be ...
  • Malcolm Taylor | Apr 21,2018 07:43 PM EDT
    I guess I could compile a similar list of things I would have done differently if I built the same house again. Unless they really impeded the way I used the house, or my enjoyment of it, rather ...
  • Scott Wilson | Apr 21,2018 07:18 PM EDT
    Elden, now that you've been living in your house for a while I was wondering if you were going to correct any of the deficiencies you've mentioned sometime soon? Most people don't have the insight ...
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