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  1. #27
    Join Date
    Apr 2005
    Location
    new jersey
    Posts
    752
    I would advise replacing the flex with steel!! What if this stuff fails.How you gonna replace it.

  2. #28
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    just saw the vidio. Looks like the typical nc system. Looks like you may have a damper zone system from the control on the furnace.
    you would IMHO do better and save more by ripping it all out and run two main trunk lines with flex take offs as short as possible to the registers
    you can then bax in the trunks if you like
    that nightmare srider system should never have passed inspection IMO

  3. #29
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    6,784
    Quote Originally Posted by tinknocker service tech View Post
    just saw the vidio. Looks like the typical nc system. Looks like you may have a damper zone system from the control on the furnace.
    you would IMHO do better and save more by ripping it all out and run two main trunk lines with flex take offs as short as possible to the registers
    you can then bax in the trunks if you like
    that nightmare srider system should never have passed inspection IMO
    X2, I hate spiderweb duct systems, sometimes you have no choice but most of the time it can be ducted with trunk lines.

  4. #30
    Join Date
    Aug 2012
    Posts
    83
    it's not a zoned system.

    I might replace the flex with sheet metal tube before it gets mudded up.

  5. #31
    Join Date
    Jul 2008
    Location
    Rochester NY
    Posts
    4,721
    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.

    Attachment 327661 Attachment 327671 Attachment 327681 Attachment 327691

    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:

    Attachment 327701

    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.

  6. #32
    Join Date
    May 2007
    Location
    Dry as a bone Tucson
    Posts
    4,292
    I have done it for a few customers. The best time to have it done is during a major remodel. On one job the customer added 600 square feet and we reused his existing heat pump.

    Name:  smith037.jpg
Views: 143
Size:  26.1 KB
    Some Talk, Some Do
    "keeping condensing pressures low and evaporator pressures high"
    "Some customers are more interested in comfort than energy savings"
    Blog
    Web
    Facebook


  7. #33
    Join Date
    May 2007
    Location
    Dry as a bone Tucson
    Posts
    4,292
    Quote Originally Posted by newstudent View Post
    it's not a zoned system.

    I might replace the flex with sheet metal tube before it gets mudded up.
    http://i1201.photobucket.com/albums/...C/smith040.jpg

    Spiral is my choice on the round stuff.Flex should be minimized as much as possible.
    Some Talk, Some Do
    "keeping condensing pressures low and evaporator pressures high"
    "Some customers are more interested in comfort than energy savings"
    Blog
    Web
    Facebook


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