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  1. #1
    Donald Wall's Avatar
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    Default dryer vent thru roof

    clothes dryer was venting thru roof vent. The current vent cap is held on with self tapping screws and is positioned so low that it restricts air flow. I found a simular shaped vert cap that is riveted to a 3" dia sleve.

    Question: When attaching the new vent cap assembly to older existing dryer vent duct, would you use a silicone sealent? Can 181B-FX duct tape be used on this outside application.

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  2. #2
    Join Date
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    Memphis TN.
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    Default Re: dryer vent thru roof

    Quote Originally Posted by Donald Wall View Post
    clothes dryer was venting thru roof vent.

    Question: When attaching the new vent cap assembly to older existing dryer vent duct, would you use a silicone sealent? Can 181B-FX duct tape be used on this outside application.
    Donald,
    #1=No!!

    #2=no, It's not UV Rated.

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  3. #3
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    Default Re: dryer vent thru roof

    Dryer vent on the roof should have a damper, and not be vented through a roof vent used for ventilation.


  4. #4
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    Default Re: dryer vent thru roof

    This is typical of this area. Make sure the screen is removed when used for a dryer.

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    Jim Luttrall
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    Dallas, Texas

  5. #5
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    Default Re: dryer vent thru roof

    Here is a cross section of a dryer vent roof cap, they should have the neck sticking down, made as part of the roof cap, onto which the dryer exhaust duct fits and is sealed.

    Fantech: Accessories - Exterior Vents

    The dryer exhaust duct *should not* just go up into a roof vent cap and be sealed/foamed/whatever around.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  6. #6
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    Default Re: dryer vent thru roof

    For reports, if anyone wants them:

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  7. #7
    Joel Mizrahi's Avatar
    Joel Mizrahi Guest

    Default Re: dryer vent thru roof

    Roof mounted dryer vent (gas fired) with screen. This photo was taken at a 9 month old townhouse unit.

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  8. #8
    Adam Horowitz's Avatar
    Adam Horowitz Guest

    Default Re: dryer vent thru roof

    Quote Originally Posted by Jim Luttrall View Post
    This is typical of this area. Make sure the screen is removed when used for a dryer.
    Is there a better/different screen to use instead? I worry about bees, etc getting in.


  9. #9
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    Default Re: dryer vent thru roof

    Quote Originally Posted by Adam Horowitz View Post
    Is there a better/different screen to use instead? I worry about bees, etc getting in.
    The damper will prevent that from happening. This is why you have to use one with a damper on it and not the screen

    Scott Patterson, ACI
    Spring Hill, TN
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  10. #10
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    Default Re: dryer vent thru roof

    The integral back draft valve will stop bees, air, etc. as long at it works. One sure fire way to make sure it stops working is to leave the screen in place.
    There is 100% probability that screens on dryer vent terminations will stop up with lint and a very small chance that bees will find their way into a dryer vent termination that does not have a screen.
    Clogged dryer vents cause fires, never heard of bees causing a fire.
    2003 IRC
    M1501.1 ... Screens shall not be installed at the duct termination.
    ...Exhausts shall be equipped with a backdraft damper.


    Jim Luttrall
    www.MrInspector.net
    Dallas, Texas

  11. #11
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    Default Re: dryer vent thru roof

    From yesterday's inspection.

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    Jim Luttrall
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  12. #12
    Adam Horowitz's Avatar
    Adam Horowitz Guest

    Default Re: dryer vent thru roof

    Quote Originally Posted by Jim Luttrall View Post
    The integral back draft valve will stop bees, air, etc. as long at it works. One sure fire way to make sure it stops working is to leave the screen in place.
    There is 100% probability that screens on dryer vent terminations will stop up with lint and a very small chance that bees will find their way into a dryer vent termination that does not have a screen.
    Clogged dryer vents cause fires, never heard of bees causing a fire.
    Hi guys,

    Great feedback. I'm not sure that I know what is meant by an "integral back draft valve"? Is that the same as a damper?

    I've seen these mostly:

    dryer vent thru roof-dryer-roof-vent-gif

    They have a damper in them. It sounds like most are in agreement that these will keep critters out. Do you have to worry about squirrels, birds, etc with not screening?


  13. #13
    Adam Horowitz's Avatar
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    Default Re: dryer vent thru roof

    Quote Originally Posted by Jim Luttrall View Post
    From yesterday's inspection.
    Wow - scary stuff!


  14. #14
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    Default Re: dryer vent thru roof

    Quote Originally Posted by Adam Horowitz View Post
    Hi guys,

    Great feedback. I'm not sure that I know what is meant by an "integral back draft valve"? Is that the same as a damper?

    I've seen these mostly:

    dryer vent thru roof-dryer-roof-vent-gif

    They have a damper in them. It sounds like most are in agreement that these will keep critters out. Do you have to worry about squirrels, birds, etc with not screening?
    Yep, damper, flapper valve.

    You have to worry about squirrels on anything, very destructive creatures. Where possible keep them off the roof. The will gnaw on sewer vent flashings, eat their way into attics, gnaw on wires, etc.
    Generally though, I have not seen them be a big problem on dryer vents.

    Jim Luttrall
    www.MrInspector.net
    Dallas, Texas

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