Do I Need a New Roof? – #5 Exhaust Vents

Exhaust Vents

Most homes have at least one type of exhaust fan that exits into the attic. The most popular is the bathroom fan, but others include kitchen exhaust and dryer vents. If the fan exit through the attic it is important that it also is vented to the outside of the roof. If not this hot moist air will cause severe condensation in the attic and even mold growth. Here are some examples of what a fan looks like in the attic unvented and then vented to the outside:

exhaust vent_3

exhaust vent_1exhaust vent_2

There are vent kits that can be purchased at you local home improvement store to do this yourself. It includes the flexible pipe, attachments and the vent installed on the roof. We hope to have a video out soon that will give you the step by step process for correct installation.  If you would like to be notified, contact us.


2 Responses

  1. i am getting sever condensation in my attic. i have been having this prob since i put my addition on. i have tried several several things to fix the problem, but have not yet solved it. i get frost on the inside of the roof from the overhang to the peak. and when it gets warm outside it melts and begins to rain in my house. i put a exhaust fan in last summer, but it only goes down to 50*, so its not doing much good. my pitch is a 4-12 with only a 1 foot overhang. i also hav regular roof vents in also. someone told me that i dont hav enough air flow? and it is staying to warm up there. im at a loss. if i could get some answers that would be great. thank you steve

  2. Hi Steve,
    It sounds like there is more heat escaping into the attic than the ventilation can handle. If you can get into the attic it would be important to check and make sure you have adequate insulation, and that it is covering all areas, especially around places like can lights, bathroom exhaust vents, around ducts that penetrate the ceiling, etc. Another big problem is bathroom or dryer exhaust vents that vent into the attic. These vents need to be piped to the outside via special duct and exhaust vents. Check out Home Energy Control’s website for help with insulation and ventilation questions at and check out our website at for condensation problems that are the result of too much humidity from the furnace being pumped into the home. I hope this helps, and please write back if you have any other questions.

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