Recent Comments and Answered Questions on Green Building Advisor

  • Martin Holladay | Mar 19,2010 03:52 PM EDT
    Kevin, You're right: upgrading from R-20 Icynene to R-38 Icynene is expensive. That's a marketing problem for Icynene -- and it's a major reason why many builders prefer to install R-38 ...
  • | Mar 19,2010 02:58 PM EDT
    Martin, wow, lots of posts here with many interesting points of view. If I follow your statement that R-38 is 47% better than R-20 and technical, yes it is, then why not use R-72. After all, ...
  • Martin Holladay | Mar 19,2010 01:35 PM EDT
    Jim, I've had no experience with the Garaga Standard +.
  • John Brooks | Mar 19,2010 01:29 PM EDT
    Scott, Thank you for changing the tone of this discussion. I think there is an air control strategy currently practiced in the Northeast that could work well in almost all climates. Builders ...
  • | Mar 19,2010 01:06 PM EDT
    I would like to hear your thoughts on the Garaga Standard Plus. I am a home owner currently shopping for a door. Your article confirmed many of my suspicions. Thanks, Jim
  • Martin Holladay | Mar 19,2010 11:02 AM EDT
    Jesse, You're probably right that a blower-door test will reveal some potential water leaks. But it won't reveal them all. Some of the best water-management details are old-fashioned lapped ...
  • | Mar 19,2010 10:56 AM EDT
    I would also hope that a positive side effect of greater scrutiny towards air leakage is that it will help us out tremendously with our even larger building problem, water leaks. We still don't ...
  • Michael Chelnov | Mar 19,2010 10:41 AM EDT
    PS you can drag it to see the whole
  • Michael Chelnov | Mar 19,2010 10:40 AM EDT
    This will be more legible....I'm not a pro at this... http://picasaweb.google.com/chelnovm/TemperatureDryAndWetBulbDewPoint?authkey=Gv1sRgCOS1lejTgK3nTQ#
  • | Mar 19,2010 10:21 AM EDT
    Robert, the facts are clear, increasing component rvalues does not equal actual reduction in energy consumption. REM/Rate, REM/Design and Energy Gauge do not provide the us with accurate ...
  • Michael Chelnov | Mar 19,2010 10:17 AM EDT
    here's the link... http://picasaweb.google.com/chelnovm/TemperatureDryBulbAndWetBulb?authkey=Gv1sRgCJuqwODNqYrTzQE#5450345221267046482
  • Michael Chelnov | Mar 19,2010 10:17 AM EDT
    Thanks for all you input. I will provide more responses soon. It occurred to me that no discussion of summer condensation in a crawl space is serious without climate data. The site is located ...
  • | Mar 19,2010 09:49 AM EDT
    Here's a Dupont document with some interesting temperature vs R-value curves for polyurethane foam, which is dependent on the boiling point of the refrigerant used as the blowing ...
  • | Mar 19,2010 09:42 AM EDT
    Hi Martin, Just a few comments before I take off for spring break, when I’ll be incommunicado for a week. Thanks for picking up on this issue. ASTM will be having a Condensation Conference ...
  • | Mar 19,2010 09:38 AM EDT
    Making buildings airtight is the key to performance and durability, ACH50 of 1.5 or less is very realistic in new construction. Great things happen from a comfort standpoint when air movement ...
  • | Mar 19,2010 12:51 AM EDT
    Bruce: I have seen, but can not find, said charts for cellulose and fiberglass batts, and the data was right on what Robert said. If I can find the *&^% file, I'll post it. Oak Ridge Labs, or ...
  • | Mar 18,2010 08:13 PM EDT
    Thank you Joe, I have been teaching building science for the pass 5 years. At the beginning I use the term FART FAN. 30 years in construction that's what we called it. Students would look at me ...
  • | Mar 18,2010 07:53 PM EDT
    Phenolic foams have a history of problems, including shrinkage, water absorption and metal corrosion. It's possible that the newer varieties have overcome some of these, but there is as yet no ...
  • | Mar 18,2010 07:49 PM EDT
    "Is it worth it?" has many dimensions and as many answers. You want to improve the thermal efficiency of the house and have chosen a natural, recycled, low-embodied energy insulation material. ...
  • Martin Holladay | Mar 18,2010 07:31 PM EDT
    Lauren, Yes, it's worth it. Adding foam on the interior definitely addresses thermal bridging through studs and improves the R-value of the wall. Because you're worried about condensation in your ...
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