Recent Comments and Answered Questions on Green Building Advisor

  • | Feb 16,2018 09:09 AM EST
    Thank you so much for the expert advice!!
  • Martin Holladay | Feb 16,2018 09:03 AM EST
    Trevor, I have no idea if your builder knew what he was doing. I suspect not. Ventilation air flows tend to be quite low. An entire house often needs just 50 to 90 cfm. Typically you'll ...
  • Martin Holladay | Feb 16,2018 08:51 AM EST
    Five Grams, A roofer can help you extend the overhang at the eaves and rakes with pre-painted drip-edge. You can order a custom drip-edge, extra stiff and extra wide, and install it at the ...
  • | Feb 16,2018 08:26 AM EST
    Thank you Martin. Our overhangs are quite small so I’m afraid the 5” EPS won’t be an option but if we can afford the cost 3” closed cell on the exterior could be an option. I will keep the ...
  • | Feb 16,2018 08:20 AM EST
    I realised after the writing this post that my recollection of water heater specs was suspect; I'm no longer even sure they were Rheem units. It's also possible I was comparing datasheets of ...
  • Martin Holladay | Feb 16,2018 05:42 AM EST
    Reid, There are lots of ways to read this data, and I'm not an expert on the issue. That said, I think the point is that residential energy use is pretty constant, as you correctly point out, ...
  • | Feb 16,2018 05:04 AM EST
    Exterior foam is certainly a "perfect" solution but really expensive. The cost of batts and their installation alone would be several times that of cellulose on the attic floor. The roof would ...
  • Martin Holladay | Feb 16,2018 04:57 AM EST
    Ryan, Only you can make the judgment call concerning the trade-offs. More R-value is better -- the only downside is the lower ceiling height. We don't know how tall you are. When rugs or ...
  • Martin Holladay | Feb 16,2018 04:53 AM EST
    T. Carson, There have been lots of studies of minisplit electricity use. To generalize broadly, the annual average COP (efficiency) of these installations ranges from a bit over a COP of 3 in ...
  • Martin Holladay | Feb 16,2018 04:49 AM EST
    J.B., If you take Malcolm's advice and run your water supply pipes in your walls, just make sure they aren't exterior walls. In a cold climate, pipes in exterior walls can freeze.
  • Martin Holladay | Feb 16,2018 04:46 AM EST
    Malcolm, A PV system can make financial sense, even if a house has relatively low electricity bills, and even if the net-metering agreement resets the credit for surplus electricity production to ...
  • Martin Holladay | Feb 16,2018 04:33 AM EST
    Jake, Yes, you are describing the steps correctly. Be sure to take the necessary time to fit your mineral wool batts carefully around the wiring and cross-bridging, without leaving any voids.
  • Martin Holladay | Feb 16,2018 04:26 AM EST
    Douglas, It sounds like you're doing your homework. Good luck.
  • Martin Holladay | Feb 16,2018 04:13 AM EST
    Five Grams, The good news is that you have decided to insulate the brick walls on the exterior. That approach is by far the best way to insulate an old multi-wythe brick wall. I advise you to ...
  • | Feb 16,2018 03:58 AM EST
    Thanks for your advice. I'm confidant I got my inputs right, I'm just a bit taken aback by the good news. Especially the low cooling load. We've always had low electric bills but we ...
  • Ryan O'Rourke | Feb 16,2018 02:45 AM EST
    Swede on my mom's side (last name Carlson actually). The coldness is what worries me about the tile, which is why I thought to put throw rugs in spots. Don't care as much in the laundry room, or ...
  • T Carlson | Feb 16,2018 02:30 AM EST
    Nice to see a fellow sauna (sow na) - if that doesnt make sense I take it back - fan. You fin? Me too. I wouldnt worry or mess with it. Floating cork-backed floor with rugs will work great ...
  • T Carlson | Feb 16,2018 01:34 AM EST
    That's great no one is freezing to death, bigger question is what do these units cost to run when they are in a real prolonged cold snap? And will they keep an even 70F day and night or do ...
  • Ryan O'Rourke | Feb 16,2018 01:25 AM EST
    I would like to ask the fine users here - if I was to put 1/2" or 3/8" fanfold EPS on my basement floor over the concrete, then what would be my flooring options, and what would I need to lay over ...
  • | Feb 15,2018 10:56 PM EST
    @Martin, Just wanted to update that I finally got a Fujitsu certified tech out and he came across some issues with the original install. I now have my main first floor unit hooked up to a wired ...
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