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Old 02-13-2012, 04:08 PM   #1
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Vapor Barrier Needed in FL?


I belong to a different forum and one of the members had a question.
Told them this is the best place to ask since you guys and gals are very informative.

The person is having their house remodeled. The kitchen vent used to go through an exterior wall, which is brick, but is being moved to go through the roof. They asked their contractor if they were going to need a vapor barrier when the hole through the wall is closed off.
The contractor laughed at them.

Any info for them concerning this?

I'm going to post a link to this for them to see your responses.

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Old 02-13-2012, 04:23 PM   #2
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Vapor Barrier Needed in FL?


Going through the roof is likely OK in Fla, but if it is ever cool you may get condensation running back down, or at least chit scaling off the vent. I have no idea about warm climates, as mine is on the cool side, but that is something to find out about from the local building department. Often, a kitchen vent goes out the side and slopes down a few degrees to let any condensation drip outside. I would guess that you could be below the dew point fairly often, and a drop of yukky water in your breakfast may have zero appeal. As for the VB, I don't see anything to laugh about. If the house is old and has done fine with or without one, then duplicate that at the old hole. You'll know about the vb, or not, when destruction starts. Whether or not you "need" one is debatable, but I'd do whatever has been working. Sometimes in warmer, humid climates they are installed on the outside of the wall so when/if the Air Conditioning is turned on you don't get condensation in the wall. Whatever you do, air seal around the new and the old holes.

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Old 02-13-2012, 04:43 PM   #3
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Vapor Barrier Needed in FL?


No in florida.
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Old 02-13-2012, 10:29 PM   #4
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Vapor Barrier Needed in FL?


OK. I withdraw my "maybe". I'd sure never go straight up, but I don't know about Fla for sure. I guess nailbag votes against them, and that sure makes sense. All those in favor say.....
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Old 02-16-2012, 09:36 PM   #5
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Vapor Barrier Needed in FL?




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