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  1. #1

    Default help Identify these marks on roof

    To start with, I wish the photo was better, but unfortunately I had a camera malfunction while on the roof so I had to take photos with my phone and forgot to reformat the camera setting. This was the only photo I could get to upload. Now to the issue. The roof I was on had uniform dark lines across the middle of some shingles. It appeared to be granule loss but I'm not sure if it is by design, a defect, or part of the normal aging process. The roof is a 15 to 20 yr. Roof and was installed 9 to 10 yrs ago. It is on both the north and south facing slopes. Any comments or suggestions would be appreciated.

    I figured out how to add another Photo! Any suggestions would be helpful...

    20150306_103102 (2).jpg

    20150306_103115 (2).jpg


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    Last edited by George Hallaron; 03-07-2015 at 09:01 PM. Reason: additional info.
    F.I.R.E. Services
    George Hallaron: Owner primary inspector
    Bienvenue Home Inspections LLC

  2. #2

    Default Re: help Identify these marks

    Appears to be marks left by shingle jacks used for scaffold. Roof does not appear to be so steep they needed to use them though.

    Here is one type.

    How To Install Roof Jacks - Work Safely On A Steep Roof With Proper Roof Scaffolding


  3. #3
    Join Date
    Aug 2011
    Bennett (Denver metro), Colorado

    Default Re: help Identify these marks

    If there is granular loss on the stripes, then I lean toward manufacturer's defect.

    - - - Updated - - -

    If there is granular loss on the stripes, then I lean toward manufacturer's defect.

    If you choose not to decide, you still have made a choice.

  4. #4
    Join Date
    Mar 2007
    Plano, Texas

    Default Re: help Identify these marks

    Manufacturers defect randomly distributed as they blended bundles during installation. It may have just been one or two bundles of shingles but the roofer did a good job of "shuffling" to blend but he missed the strip or the granules washed off after installation.

    Jim Luttrall
    Plano, Texas


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