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Thread: AC Duct

  1. 06-09-2009, 08:42 PM #1
    krarno
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    AC Duct

    What are the problems with installing duct work on top of a flat roof and is it legal?
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  2. 06-09-2009, 09:02 PM #2
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    tech45
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    People do it every day...weather and heat infiltration are the biggest issues that need to be considered when fabricating / installing .
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  3. 06-09-2009, 09:11 PM #3
    krarno
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    Thanks tech45
    We have a situation where the installation looks like a preying mantis on top of this house. Are there any issues regarding codes that you are aware of?
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  4. 06-09-2009, 09:13 PM #4
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    on a residential install? I cant imagine that looking like anything but crap. just out of curiosity, what state is this in?
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  5. 06-09-2009, 09:15 PM #5
    krarno
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  6. 06-09-2009, 09:25 PM #6
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    I'd have to guess that this could just be a " free for all " ...no smoke / fire damper issues , no outside air requirements...just " run what you brung ". As long as the structure penetrations are firestopped I can't think of anything.
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  7. 06-10-2009, 04:17 PM #7
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    motoguy128
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    I would definitely look at some sort of minisplit system, rather than place ductwork on the exterior of the home. Seems like you could also do a PKG unit and install ductwork in the corners of the walls at the ceiling and drywall frame around them. But that might be worse yet.
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  8. 06-10-2009, 04:23 PM #8
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    Pictures or it didn't happen!
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  9. 06-10-2009, 08:05 PM #9
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    exterior duct

    The minimum insulation value is r-8 for exterior duct in az, and im sure its the same there.Heat gain is a huge problem and so is the jumbo sized duct after you have r-8 insulation in it.
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