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Thread: Ridge Venting

  1. #1
    Join Date
    Nov 2011
    Location
    Maine
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    3

    Angry Ridge Venting

    I had asked previously about the shallow slope of my roof not ventilating the attic appropriately. After doing some research, it looks like a fabric, something like Typar, was placed over the ridge under the vent material. Can anyone tell me why this is necessary? Or, was it done incorrectly and that is the reason for the air not venting? Thanks

  2. #2
    Join Date
    Aug 2007
    Location
    Maryland
    Posts
    1,159

    Default Re: Ridge Venting

    To vent properly, intake vents are also needed. If you don't have enough soffit venting the system won't work properly. In any event even proper ridge & soffit venting won't keep the attic completely cool.
    The fabric you see may be part of the soffit vent. I have never heard of or seen anybody use Typar under the ridge vent.

  3. #3
    Join Date
    Nov 2011
    Location
    Maine
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    Default Re: Ridge Venting

    I have continuous soffits and they are clear. I have total of 24 inches of fiberglass in the attic and all penetrations into that space are sealed. The problem is ice dams. I had them before and after I had the roof done. The fabric just doesn't seem to be air permeable and I have found no information on the web about such a vent system. I am probably going to trim some of the fabric in one bay to see if it is part of the vent or something else. Thanks for the reply.

  4. #4
    Join Date
    May 2011
    Posts
    251

    Default Re: Ridge Venting

    I've never heard of placing a fabric like that under the ridge vents. That would probably reduce the venting capacity by ohhh... probably 95%.
    1925 Two-Story Stucco Beaux Arts Neoclassical

  5. #5
    Join Date
    Dec 2010
    Location
    Houston Texas
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    2,360

    Default Re: Ridge Venting

    Yep, the vents are useless with the Typar there.


    Where is the dopeslap icon?

  6. #6
    Join Date
    Aug 2007
    Location
    The Great White North
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    4,045

    Default Re: Ridge Venting

    Quote Originally Posted by swkdfnpc View Post
    I had asked previously about the shallow slope of my roof not ventilating the attic appropriately. After doing some research, it looks like a fabric, something like Typar, was placed over the ridge under the vent material. Can anyone tell me why this is necessary? Or, was it done incorrectly and that is the reason for the air not venting? Thanks
    Quote Originally Posted by swkdfnpc View Post
    I have continuous soffits and they are clear. I have total of 24 inches of fiberglass in the attic and all penetrations into that space are sealed. The problem is ice dams. I had them before and after I had the roof done. The fabric just doesn't seem to be air permeable and I have found no information on the web about such a vent system. I am probably going to trim some of the fabric in one bay to see if it is part of the vent or something else. Thanks for the reply.
    If the material you are seeing is indeed a housewrap then as others mentioned it shouldn't be there -- considering one of the main purpose of housewrap is an air barrier ( a very low air permance ).

    The ice damn issue has more to do with heat escaping from the lower level and warming the underside of the roof. Seal any penetrations and properly insulate those areas to elimanate the cause of the ice damns.
    "" an ounce of perception -- a pound of obscure "
    - Rush

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