View Full Version : AC Duct
06-09-2009, 08:42 PM
What are the problems with installing duct work on top of a flat roof and is it legal?
06-09-2009, 09:02 PM
People do it every day...weather and heat infiltration are the biggest issues that need to be considered when fabricating / installing .
06-09-2009, 09:11 PM
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?
06-09-2009, 09:13 PM
on a residential install? I cant imagine that looking like anything but crap. just out of curiosity, what state is this in?
06-09-2009, 09:15 PM
06-09-2009, 09:25 PM
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.
06-10-2009, 04:17 PM
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.
Gunnery Sergeant Hartman
06-10-2009, 04:23 PM
Pictures or it didn't happen!
06-10-2009, 08:05 PM
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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