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  1. #1
    Doug Keifer's Avatar
    Doug Keifer Guest

    Default Shingle Algae and Moss

    Would like to get some inspectors opinion on roof stains and moss, Does roof algae ( Black streaks effect the life of the roof. Does Moss on a roof hurt the roof? Thanks for your opinions.

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  2. #2
    Join Date
    Mar 2007
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    Default Re: Shingle Algae and Moss

    Quote Originally Posted by Doug Keifer View Post
    Would like to get some inspectors opinion on roof stains and moss, Does roof algae ( Black streaks effect the life of the roof. Does Moss on a roof hurt the roof? Thanks for your opinions.
    Opinions vary, some say yes, some say no. I think not.
    Within 10 years or so, almost all roofs have it, but a dark roof does not show up as much.

    Last edited by Rick Cantrell; 12-14-2011 at 03:21 AM.
    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  3. #3
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    Default Re: Shingle Algae and Moss

    the black stains do little, but moss and lichen growth can affect. Lichen can deteriorate the granular surface and moss can create in affect exactly what an ice dam does by allowing water to build up under the shingle.
    All can be cured with different types of chemicals. No power washing!!!


  4. #4
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    Default Re: Shingle Algae and Moss

    Thanks for expanding on that Wayne.
    My tunnel vision comment focused only on the black stain portion of the OP.

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  5. #5
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    Default Re: Shingle Algae and Moss

    A species of algae known as Gloeocapsa - natural pigments produced by the algae cells result in the dark discoloration, usually visible after the roofs are about five to ten years old.

    Moss will rot out the felt back and cellulose fibres of the shingles.


  6. #6
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    Lake Barrington, IL
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    Default Re: Shingle Algae and Moss

    Quote Originally Posted by wayne soper View Post
    No power washing!!!
    I don't like hearing that. One of the joys in life is blasting things into oblivion.

    Eric Barker, ACI
    Lake Barrington, IL

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