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Thread: Flex ducts on joists
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06-05-2007, 09:32 PM #1
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Flex ducts on joists
I know they are supposed to be suspended, but being as how they are insulated, why can't flex ducts lay on the joists?
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06-05-2007, 09:40 PM #2
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Re: Flex ducts on joists
They can, as long as the ceiling joist are 1-1/2" wide, and they are.
Originally Posted by Thom Walker
The problem comes in from the ceiling being insulated, you do not want to lay the flexible ducts on the insulation, hence laying them on the ceiling joist usually does not work.
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06-06-2007, 07:50 PM #3
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Re: Flex ducts on joists
Condensation on the ducts.
The ducts crush the insulation, reducing its R value.
The ducts displace insulation, reducing it R value.
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