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  1. #14
    Join Date
    Jul 2008
    Location
    Rochester NY
    Posts
    4,763
    DOE/Steven Winter Assoc has recently completed a study and built standards for spray foam insulating duct in attics. I attended a webinar where the author, Bill Zoeller presented their findings. It was fantastic:

    http://bit.ly/sprayfoamducts

    Early adopters will need to be significantly involved in the process to insure quality, probably having to lead the contractors until these strategies and best practices for implementation trickle to the field.

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    You can encapsulate unburried duct. It doesn't meet Challenge Home requirements so you wouldn't design this way, but apparently is a significant improvement for retrofit:

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    Here's my spray foam picture album for those interested.
    Which makes more sense to you?
    CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
    ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%

    DO THE NUMBERS! Step on a HOMESCALE.
    What is comfort? Well, it AIN'T just TEMPERATURE!

    Energy Obese? An audit is the next step - go to BPI.org, or RESNET, and find an auditor near you.

  2. #15
    Join Date
    Sep 2009
    Location
    Arnold mo
    Posts
    3,978
    Insulating at the ceiling beats insulating at the roof deck, not just because the roof has a greater surface area, but also because of how hot the roof deck gets, as opposed to how hot it is at the attic floor. Spray foaming the ducts and covering them with insulation is the way to go.
    An answer without a question is meaningless.
    Information without understanding is useless.
    You can lead a horse to water............
    http://www.mohomeenergyaudits.com

  3. #16
    Join Date
    Jul 2008
    Location
    Rochester NY
    Posts
    4,763
    Really good designers (and people I admire) seem to avoid absolutes, and the rigidity of thought that absolute thinking creates. I'm trying to learn to be a really good designer, and even eventually be a person admired by others.

    It requires "it depends" thinking instead of "this is the way to go" thinking. It requires breaking firmly rooted bad habits.

    There are lots of circumstances where spraying the roof deck IS the way to go, it really depends...

    Breaking rigid thinking in myself (and others) is really tough.

    Which makes more sense to you?
    CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
    ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%

    DO THE NUMBERS! Step on a HOMESCALE.
    What is comfort? Well, it AIN'T just TEMPERATURE!

    Energy Obese? An audit is the next step - go to BPI.org, or RESNET, and find an auditor near you.

  4. #17
    Join Date
    May 2013
    Location
    Los Angeles, California
    Posts
    131
    I know this is a 8 months old thread. I was curious to know how the sprayed in foam will withstand heat such as in a heat treatment in a attic for termites.

    The heat treatment process raises the temperature to 130˚F. I was told by the termite company that anything plastic will melt during this process and must be removed from the attic space.

    Last edited by Monarke4; 07-19-2013 at 11:01 PM. Reason: additions

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