Bathroom exhaust vent necessary?


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Old 12-01-15, 07:52 PM
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Bathroom exhaust vent necessary?

I found out my bathroom exhaust vents in to the attic. I know it is supposed to go outside due to humidity, but I wonder if my situation makes that not necessary. I have a ranch with a crawlspace type attic. The ends of the attic are not sheeted. It is enclosed only by siding and a thin layer of foam insulation. It seems to me that the humidity added by that exhaust fan would be negligible. Am I fooling myself?
 
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Old 12-01-15, 08:50 PM
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Am I fooling myself?
Yes. If the temperature in the attic is even a couple of degrees colder than the air you are discharging.... you will get condensation.
 
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Old 12-01-15, 09:18 PM
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The guy at the big box store recommended flex tube without insulation. Is that acceptable for exhaust venting?
 
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Old 12-01-15, 09:46 PM
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If you have a cold attic.... that will sweat. I use insulated ductwork in cold zones.
 
 

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