Recent Comments and Answered Questions on Green Building Advisor

  • John Clark | Jan 19,2018 09:38 AM EST
    A lot of devices emit "blue light" other than just LED bulbs. It's just a matter of choosing the correct bulb. After all you wouldn't want to light your house with backlights no would ...
  • Martin Holladay | Jan 19,2018 09:37 AM EST
    Randy, Wood stoves in tight houses are tricky. The issue is pretty simple, and you clearly understand what's going on. If the owner isn't willing to crack a window, this house needs an outdoor ...
  • | Jan 19,2018 09:10 AM EST
    I'm looking at a number of insulation options, but my original post was in reference to XPS. I'll likely use a combination of products. I'll be insulating around my foundation as well. I'm ...
  • | Jan 19,2018 08:37 AM EST
    Added weight is one problem of using wood over metal, you would have to account for this in truss design and supply truss designer with your hanger layout. Second issue is why reinvent the ...
  • Bennett G. | Jan 19,2018 08:10 AM EST
    If the hole for the drain/trap is open to semi- or un-conditioned space, it would be good to seal that up as well. If you didn't air-seal this and the wall, picture air traveling up through the ...
  • Martin Holladay | Jan 19,2018 08:03 AM EST
    Daren, Walls in Climate Zone 4 do not need a vapor retarder. If a building is air-conditioned, an interior vapor barrier like polyethylene can create more problems than it solves. In your ...
  • Bob Irving | Jan 19,2018 07:58 AM EST
    you can cut & push the thicker foam into place; thinner foam will break easier so you'll be dealing with scraps. Either will work though.
  • Martin Holladay | Jan 19,2018 07:57 AM EST
    Bennett, Q. "What's the best way to seal the inside layer of foam to the drywall / joists and to the top of the kneewall?" A. If I understand you correctly, you plan to install a layer of ...
  • | Jan 19,2018 07:56 AM EST
    Martin, Thank you very much! I have searched this site, GarageJournal, and others trying to find a definitive answer. I do plan a two-prong approach to air sealing. First, I plan to seal all ...
  • Randy Williams | Jan 19,2018 07:49 AM EST
    David, I use 6-mil poly behind my showers, only because the codes in my area require it. Both the craft face or MemBrain will also work well. The air tight drywall approach will work well if ...
  • Bennett G. | Jan 19,2018 07:18 AM EST
    Thanks, Bob. So you'd recommend 2" foam for the outer and inner "cobbles" vs 3/4" or 1"? Easier to place/wedge prior to foaming the perimeter? And 1" for the vent baffle vs 3/4" because 3/4" is ...
  • Bennett G. | Jan 19,2018 07:01 AM EST
    @ Bill - I'm not in a metro area either. I'm looking at future HVAC plans for a remodel and thinking I'll use a remote service (a number have been mentioned on this forum) if I can't find a good ...
  • Bennett G. | Jan 19,2018 06:57 AM EST
    First, I'm no HVAC expert, just an engineer that's done a lot of thinking and reading about residential systems, particularly the ones in the houses I've owned. What Dana Said: get your load ...
  • Martin Holladay | Jan 19,2018 06:43 AM EST
    First, a note to GBA readers: Scott's comment don't refer to the article where he posted his comment. His comment belongs on another page. This is the article he is talking about:
  • Martin Holladay | Jan 19,2018 06:26 AM EST
    Timothy, Most types of siding do an excellent job of stopping rain. The amount of liquid water that gets past siding is quite small. Moreover, a rainscreen is designed to encourage fast drying, ...
  • Martin Holladay | Jan 19,2018 05:32 AM EST
    David, In Climate Zone 5, building codes require the use of an interior vapor retarder. The traditional choice was 6-mil polyethylene, which is still used on occasion in bathrooms, which have ...
  • Martin Holladay | Jan 19,2018 05:23 AM EST
    Steven, First of all, if you don't yet have much off-grid experience, you need to realize that those of us who live in an off-grid house use much, much less electricity than people who live in a ...
  • Martin Holladay | Jan 19,2018 05:05 AM EST
    Joshua, Ben Freed and David White -- two people who are familiar to longtime GBA readers -- did an excellent job on that building. Fortunately, unlike Steven Gubkin (who posted the original ...
  • Martin Holladay | Jan 19,2018 05:00 AM EST
    Robert, Plenty of people build walls with exterior rigid foam, so lots of people here at GBA have experience with this type of wall. For more information on this type of wall, see these ...
  • Martin Holladay | Jan 19,2018 04:51 AM EST
    Here is a link to the previous thread -- the thread that received 16 comments: Workshop with dwelling above
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