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Old 11-15-2009, 12:50 AM   #1
vdu
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Do I need to insulate duct in the a chase in the middle of the house


The rectangular riser is in a chase in the middle of the house. If there is any leakage, it would be from air between the ceiling and the floor of the upper level.

Do I need to insulate this? I don't see a need for that. However, someone mentioned something like that, so I want to make sure.

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Old 11-15-2009, 02:30 AM   #2
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Do I need to insulate duct in the a chase in the middle of the house


Seal the chase where it penetrates the ceiling. To prevent fresh air from getting to the duct and cooling it down or warming it up.

On the inside of the house, It doesn't need to be insulated. If the chase is sealed from fresh air from the floor/ceiling joist cavities.

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Old 11-15-2009, 12:51 PM   #3
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Do I need to insulate duct in the a chase in the middle of the house


Quote:
Originally Posted by beenthere View Post
It doesn't need to be insulated. If the chase is sealed from fresh air from the floor/ceiling joist cavities.
From what I see, it appears the chase is not sealed to the floor ceiling joist cavities. Normally, are these ceiling joist cavities sealed from outside air, or they're not insulated well?
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Old 11-15-2009, 01:53 PM   #4
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Do I need to insulate duct in the a chase in the middle of the house


They're seldom sealed at the outside walls. So you want to seal it.
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