Recent Comments and Answered Questions on Green Building Advisor

  • Dana Dorsett | May 27,2018 08:28 AM EDT
    At max output almost any mini-split is going to be oversized for the cooling load of a master bedroom, but if you run the load numbers and find a model that can modulate low enough it might still ...
  • Rick Van Handel | May 27,2018 08:16 AM EDT
    Whether it’s fastening sole plates, ledgers, or strapping, I have very little faith in Tapcons. Even with a hole drilled to their specification about 1 in 4 tends to twist the head off before ...
  • Dana Dorsett | May 27,2018 08:00 AM EDT
    Note: Like all of MA, Berkshire County/Great Barrington is in US DOE climate zone 5, not zone 6.
  • Martin Holladay | May 27,2018 05:57 AM EDT
    Kelly, In Climate Zone 5, your roof assembly should have a minimum R-value of R-49. If you plan to combine air-impermeable insulation (that means rigid foam or spray foam, or both) with ...
  • Martin Holladay | May 27,2018 05:41 AM EDT
    Lukas, There is no need to install ventilation or insulation in soffits or carport roofs if your roof assembly is unvented. Just make sure that you know where your home's air barrier is, and ...
  • Martin Holladay | May 27,2018 05:39 AM EDT
    Norman, I think you're on the right track. Tamarack offers two models of exhaust fans designed for garages; one is rated at 235 cfm, and the other one is rated at 416 cfm. Here is the link:
  • | May 26,2018 10:22 PM EDT
    Mineral wool batts for interior insulation would also add fire protection compared to the blown-in cellulose, wouldn't they?
  • Dana Dorsett | May 26,2018 08:22 PM EDT
    I'm not really an "expert" on the inner workings of Mitsubishis- I read the same specs you do and infer what I can, which often times isn't much. I don't install them for a living but have ...
  • Lydia Segal | May 26,2018 06:34 PM EDT
    Thanks for the answer. We are still in the framing stage. The infloor radiant is in as is the slab. My awareness of grab bars is high as I had complex knee surgery two weeks ago and am on ...
  • Martin Holladay | May 26,2018 06:17 PM EDT
    Sarah, You might want to contact: Postgreen Homes 1732 N Howard St, Unit C Philadelphia, PA 19122 info@postgreen.com 267.257.8899
  • sarah clarke | May 26,2018 05:43 PM EDT
    You are correct! I'm in Southern New Jersey.
  • Will Welch | May 26,2018 05:03 PM EDT
    Malcolm - I appreciate the feedback and cost-related info. This community is helping me to see things with fresh eyes and from different angles, which far outweigh my limited experience. All ...
  • Malcolm Taylor | May 26,2018 04:53 PM EDT
    Will, Increasing the thickness of your walls by 6" does mean you need to build extra floor area to be left with the same interior space, but an 80'x25' rectangular foundation only becomes an ...
  • Will Welch | May 26,2018 04:44 PM EDT
    Jon - Thanks for the article link, looking forward to reading. Roger - Thanks for the detailed response. Lots of info for me to unpack and some that's above my current knowledge level. I've ...
  • Martin Holladay | May 26,2018 04:42 PM EDT
    Sarah, I'm not familiar with the Delaware Valley, and you didn't tell us what state you live in. I'm guessing Pennsylvania, New Jersey, or Delaware -- somewhere near Philadelphia. Am I guessing ...
  • Martin Holladay | May 26,2018 04:33 PM EDT
    Kevin, In February 2017, Allison Bailes wrote a detailed article on burying ducts in insulation. Here is the link: "Buried Ducts Allowed in 2018 Energy Code." Bailes ...
  • Lance Peters | May 26,2018 04:24 PM EDT
    Hi Calum, If I had started researching these things a few years ago I could have saved her the hassle and expense of dealing with her gas furnace install. The guy who installed it stretched it ...
  • stephen sheehy | May 26,2018 04:12 PM EDT
    If the half wall is attached to a full height wall, use some robust bolts to attach the two. What stage is the build at now? If the floor hasn't been placed, just form some anchor bolts in the ...
  • Martin Holladay | May 26,2018 04:09 PM EDT
    Thomas, Thanks for your comments. I have edited the problematic sentence; the new wording is more accurate. As I noted in Comment #15, "If your bedroom has high CO2 levels, your ventilation ...
  • Roger Berry | May 26,2018 03:24 PM EDT
    Mr. Welch, Seems like everyone has covered things pretty well already. Avoiding some obviously poor choices for exterior finishes can help, but the sad developing reality is the insurance ...
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