Recent Comments and Answered Questions on Green Building Advisor

  • Dana Dorsett | May 22,2018 02:34 PM EDT
    I know it's only my hacked version of 'merican, but parsing it correctly helps: "...even if it's heated solely by the electric floor and on continuously under thermostatic control it's not ...
  • Calum Wilde | May 22,2018 02:15 PM EDT
    "it’s definitely better than a vfd." Oh, for sure. Those are huge power hogs. How long have you been running it? I thought the house was still under construction.
  • Martin Holladay | May 22,2018 02:08 PM EDT
    Trevor, Thanks very much for that information. The paragraph shown below comes from the User ...
  • | May 22,2018 02:05 PM EDT
    Mr. Holladay, You are correct. And thanks for your valuable suggestions. Corey
  • Martin Holladay | May 22,2018 01:50 PM EDT
    Reid, During his presentation, Brian Just cited one study that showed deleterious cognitive effects resulting from sleeping in rooms with CO2 above 1000 ppm. The Danish study was
  • | May 22,2018 01:49 PM EDT
    Optional CO2 sensors that integrate with the HRV/ERV are already standard offerings for the premier brands. Zehnder, UltimateAir and Jablotron all have them. I'm sure there are others.
  • David Goodyear | May 22,2018 01:47 PM EDT
    It works great so far. No problems. I don’t think that it’s higher energy per volume during steady state. The pump impeller will only move the amount of water required to maintain 50 psi.. ...
  • Reid Baldwin | May 22,2018 01:36 PM EDT
    The studies I am aware of have set the target of 800-1000 ppm because that is the level at which cognitive function seems to begin decreasing. When I am sleeping, how much cognitive function do I ...
  • Martin Holladay | May 22,2018 01:24 PM EDT
    Corey, Q. "Would it behoove us (the build team) to do away with the Zip and proceed with 1/2" CDX>WRB>Vertical Rainscreen>Hardie?" A. If I understand correctly, you aren't "doing away with the ...
  • Calum Wilde | May 22,2018 01:13 PM EDT
    I'm really curious to hear what your experience will be with the cycle stop valve. I've looked at it a couple of times but it seems that all roads lead to bad reviews. On the pro side is the ...
  • | May 22,2018 01:04 PM EDT
    Thanks for the replies, guys! Mr. Holliday- 1. My name is Corey Eshelman 2. The CDX on the interior stud wall is installed on the exterior side of said wall. ...
  • Martin Holladay | May 22,2018 12:33 PM EDT
    David, It sounds like you understand the situation fairly well. You might want to begin documenting the situation by communicating with your contractor via registered letters (dated, of course). ...
  • Dana Dorsett | May 22,2018 12:00 PM EDT
    With GSHP vs. ASHP (air source heat pump) it's a matter of upfront cost/lifecycle cost and design risk. Air is pretty much the same everywhere, and weather data sets can tell you with reasonable ...
  • Eric Sandeen | May 22,2018 12:00 PM EDT
    Thanks for the detailed answers on expected energy use. ~500kWh/ year isn't too bad I guess; I was hung up on electric resistance heat as a source compared to our efficient boiler... in ...
  • Martin Holladay | May 22,2018 11:15 AM EDT
    Corca, Q. "If we did end up having to use a conventional, sheet type WRB could we eliminate the need of a rain screen by using Tyvek DrainWrap or HydroGap?" A. Wrinkled housewraps provide some ...
  • Martin Holladay | May 22,2018 11:12 AM EDT
    Corca, Q. "If the Zip is used on the exterior double stud would air sealing/taping the interior sheathed wall still be necessary?" A. If you care about reducing air leakage, it usually makes ...
  • Malcolm Taylor | May 22,2018 11:12 AM EDT
    Corca, "1/2" vertical furring for rainscreen, 3/8" horizontal furring (to accomodate for Hardie board and batt siding." Can you clarify why the second layer of furring is necessary? ...
  • Martin Holladay | May 22,2018 11:05 AM EDT
    Corca, While the manufacturer of Zip sheathing allows builders to skip the housewrap when using Zip sheathing, some builders still install housewrap or asphalt felt as a WRB -- even when they use ...
  • Martin Holladay | May 22,2018 11:00 AM EDT
    Corca, First of all, can you tell us your name? A rainscreen gap provides many useful functions. Installing Zip sheathing doesn't allow you to skip the rainscreen gap. (I suppose you can ...
  • Steve Knapp CZ 3A Georgia | May 22,2018 10:31 AM EDT
    Derrick, I think Martin is suggesting you should have an energy expert check out your home to isolate the problem. You can probably locate someone by going to the RESNET or BPI websites.
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