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Old 06-08-2013, 10:18 AM   #1
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Insulating duct work condensation prevention


I've found most "insulating duct threads were in ref to conservation of heat loss/prevention.
Im currently finishing my basement and I am going to insulate the duct work specifically to prevent condensation from AC in the summer and heat in the winter.

Walls and rim joist are insulated with 1" foam board.

I live in NJ.

My question is...
On most of the duct work I would only be able to cover 3 sides of the duct work with fiberglass insulation due to the positioning. Is that sufficient or will condensation pool on top of duct(the side I would be unable cover)??

If not, Should I spray foam the ducts to insulate?

Basement gets very cold when running AC and vise/versa due to leaks at seams which I plan to caulk or mastic.
FYI. I do not have any supply or return in basement. Should I cut one in? Furnace and coil are obviously in basement.

Thanks,

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Old 06-08-2013, 04:01 PM   #2
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Insulating duct work condensation prevention


get a gallon of mastic brush on and paint all the seams on the ducting,anything that has cold air inside itself uninsulated will swet on the outside...but first seal all those seams and be liberal about it fan off let it cure...

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Old 06-08-2013, 04:16 PM   #3
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Insulating duct work condensation prevention


Quote:
Originally Posted by Stcrosby View Post
I'm currently finishing my basement...
I do not have any supply or return in basement. Should I cut one in?
1) How do you define "finishing" if you don't have HVAC?
2) Duct in tempered (finished with HVAC) areas don't need insulation.
3) Mastic. It's a GoodThing.
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Old 06-08-2013, 04:50 PM   #4
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Insulating duct work condensation prevention


[QUOTE=TarheelTerp;1197601]1) How do you define "finishing" if you don't have HVAC?
I see your point.
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