Connect with us

radiant barrier

Discussion in 'Home Power and Microgeneration' started by Darn Cat, Aug 8, 2006.

Scroll to continue with content
  1. Darn Cat

    Darn Cat Guest

    has anyone installed radiant barrier for attic insulation?

    how is it performing? any issues or tips?
     
  2. SteveF

    SteveF Guest

    I haven't installed one but after reading the stuff on radiant barriers on
    the ORNL web site you probably won't want to either. Also search on FTC to
    see the cease and desist orders on the companies that sell radiant barriers
    for inflated performance claims.

    Steve.
     
  3. Darn Cat

    Darn Cat Guest

    if it's ornl.gov, there are so many documents, could you provide a direct link or two?

    what specific issue was negative, ie. moisture retention, hyped performance, something
    else?
     
  4. SteveF

    SteveF Guest

    http://www.ornl.gov/sci/roofs+walls/radiant/rb_01.html

    I use Alltheweb and get a number of hits with "ORNL radiant barrier" and
    "FTC radiant barrier" as search words.

    Steve.
     
  5. Darn Cat

    Darn Cat Guest

  6. SteveF

    SteveF Guest

    That the radiant barriers are good a blocking radiant energy but that
    radiant heat gain is only a small part of the heat movement that needs to be
    handled. Increasing conventional insulation will accomplish more. Radiant
    barriers are most effective in places where radiant heat gain is a major
    factor, like Florida where, strangely enough, most of the radiant barrier
    companies seem to do their testing.

    Steve.
     
  7. daestrom

    daestrom Guest

    The only 'negative' that I see is that claims of saving 15% to 42% are
    misleading. It can save up to 42% of the ceiling heat load on A/C. But the
    ceiling heat load is <25% of the total A/C load, and the A/C load is not the
    entire electric bill.

    So if A/C accounts for 75% of your electric bill in the heat of the summer
    months, an optimistic view would be that installing a radiant barrier will
    save you 42% of 25% of 75% of your electric bill. That works out to just
    under 8% of your electric bill.

    Yes, radiant barriers work (when installed correctly). But some suppliers
    have been accused of over-stating their performance by taking quotes from
    NREL like, "Radiant barriers ... can save up to 42% of the heat load from
    your attic." Sounds a lot better than it actually is (< 8%).

    daestrom
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-