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  1. #1
    Rick Maday's Avatar
    Rick Maday Guest

    Default Delaminated roof decking

    Why only some sections?

    Solutions / Prevention?

    Baffles were rectangular cardboard "tubes" about 3" X 5".

    TIA

    4 year old roof (2nd layer)

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  2. #2

    Default Re: Delaminated roof decking

    Looks like you have air sealing/ ventilation issues. I can't explain why it shows up only in patches though.


  3. #3
    A.D. Miller's Avatar
    A.D. Miller Guest

    Default Re: Delaminated roof decking

    What rooms were below the areas in question?


  4. #4
    Phil Brody's Avatar
    Phil Brody Guest

    Default Re: Delaminated roof decking

    Lack of attic ventilation. Insulation is preventing airflow. Are the soffits open, ridge vent ?


  5. #5
    Join Date
    Mar 2008
    Location
    Charlotte NC
    Posts
    2,303

    Default Re: Delaminated roof decking

    Quote Originally Posted by Rick Maday View Post
    Why only some sections?

    Solutions / Prevention?

    Baffles were rectangular cardboard "tubes" about 3" X 5".

    TIA

    4 year old roof (2nd layer)
    Don't let the 4yr thing blind you. A lot of new (2nd layer) roofs leak! The worst is architectural shingle over 3-tab on a low pitch. Looks like a fairly low pitch from the pic.


  6. #6
    Rick Maday's Avatar
    Rick Maday Guest

    Default Re: Delaminated roof decking

    Quote Originally Posted by A.D. Miller View Post
    What rooms were below the areas in question?
    Bedrooms


  7. #7
    Rick Maday's Avatar
    Rick Maday Guest

    Default Re: Delaminated roof decking

    Quote Originally Posted by Phil Brody View Post
    Lack of attic ventilation. Insulation is preventing airflow. Are the soffits open, ridge vent ?
    My thoughts also - soffits blocked - pod vents (no ridge vent).


  8. #8
    Join Date
    Nov 2008
    Location
    Franklin, NY
    Posts
    5

    Default Re: Delaminated roof decking

    If the roof decking is currently wet, roof still leaks or those areas are over the bathrooms. If it is dry, it is probably previous moisture damage, most likely from the first layer of the roofing material. Is there a vapor barrier under the insulation? If there is no vapor barrier and you have poor ventilation, you will see the condensation in specific areas only, especially over the high moisture area. It condensates in the winter, absorbs into OSB when it melts. Delamination, mold is next

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  9. #9
    Rick Maday's Avatar
    Rick Maday Guest

    Default Re: Delaminated roof decking

    Quote Originally Posted by Vern Heiler View Post
    Don't let the 4yr thing blind you. A lot of new (2nd layer) roofs leak! The worst is architectural shingle over 3-tab on a low pitch. Looks like a fairly low pitch from the pic.
    Just added that so you guys would have all the info I have.

    Interested to hear more about the scenario you presented - this is exactly the situaton here. Way do you say that, what to you tell clients, what do you recommend.

    TIA


  10. #10
    Join Date
    Mar 2008
    Location
    Charlotte NC
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    2,303

    Default Re: Delaminated roof decking

    Quote Originally Posted by Rick Maday View Post
    Just added that so you guys would have all the info I have.

    Interested to hear more about the scenario you presented - this is exactly the situaton here. Way do you say that, what to you tell clients, what do you recommend.

    TIA
    The why I say that is from personal experience (the bad kind). I did exactly that, architectural over 3-tab on low pitch. The thicker shingles have more tendency for water to wick-up at the bottom edge plus the triple thickness created at the top of the exposure causes a slight dip where water can almost puddle. The dip doesn't show up until a few years and is not every where. The leaks come at the nails next to the butt joints of the shingles. Might explain why yours jumps rafter bays if the shingles were racked.

    What do I tell customers? Well they haven't been as dumb as me so far .


  11. #11

    Default Re: Delaminated roof decking

    you can see the insulation is tight up onto the roof, and i dont see any ridge vent panels to keep the insulation down, right now theirs no air flow

    not sure of the proper name for those panels


  12. #12

    Default Re: Delaminated roof decking

    If it is dry, it is probably previous moisture damage, most likely from the first layer of the roofing material
    A good way to find out if it's an on- going issue is to check the nail points that stick through the sheathing. If the nails securing the new layer of shingles down are rusty, you still have an issue. If you can' t find the new nail points, then they didn't use long enough nails and that's another issue.


  13. #13
    floyd pfingsten's Avatar
    floyd pfingsten Guest

    Default Re: Delaminated roof decking

    It's definitely not the pitch, its at least a 5/12. I would guess a bathroom vent close to the problem area. The roof 2x4's show mold also. Definitely moisture is not being removed. Till the moisture problem can be determined I would recommend installing a small vent in the eave vent to keep the moist air moving out out of the attic space. That is not curing the problem, but the moisture will be removed and stop the mold problem from causing additional problems. Just a thought.


  14. #14
    Join Date
    May 2009
    Location
    Washington State
    Posts
    358

    Default Re: Delaminated roof decking

    Just had one of these myself recently, same scenario - blocked vents, no circulation, quite a few freeze then dry out cycles. The OSB contained Mold and was soft, recommended removal and replacement from the trusses up.


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