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  #1  
Old 8/26/13, 2:27 PM
Harrison Cheung Harrison Cheung is offline
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Default marks on roof shingles

Hi all,

I found some houses in my neighbourhood had this issues. Please see the pictures.

http://www.flickr.com/photos/80011010@N07/ I didn't have any chance to get into the attics. Can you please tell me what causing this happened? High humidity in the attics? lack of attic ventilation?

thanks.
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  #2  
Old 8/26/13, 3:59 PM
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Michael Larson Michael Larson is offline
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Default Re: marks on roof shingles

Algae growth.

Difficult to clean.

Easier to prevent by adding a zinc strip near the top.

http://www.youtube.com/watch?v=3d9hM4Cj640



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  #3  
Old 8/26/13, 8:49 PM
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Gary Farnsworth, CMI Gary Farnsworth, CMI is offline
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Default Re: marks on roof shingles

And, cheap roofing shingles. They leave out ingredients to save money. Warranties on these roofs are maybe 5 years, and after that, this happens. Common here. The owner got what he paid for, or did not pay for.



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Old 8/26/13, 9:10 PM
Juan C. Jimenez Juan C. Jimenez is offline
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Default Re: marks on roof shingles

Something interesting I saw a few weeks ago

http://m.youtube.com/watch?v=OvIB623...%3DOvIB623hdiA



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  #5  
Old 8/26/13, 10:23 PM
Troy Weiland Troy Weiland is offline
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Default Re: marks on roof shingles

http://www.sprayandforget.com/





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  #6  
Old 8/27/13, 8:45 AM
Timothy J. Smith, CMI Timothy J. Smith, CMI is offline
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Default Re: marks on roof shingles

Quote:
Originally Posted by mlarson View Post
Algae growth.

Difficult to clean.

Easier to prevent by adding a zinc strip near the top.

http://www.youtube.com/watch?v=3d9hM4Cj640
BINGO, and tell them to extend that downspout.



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  #7  
Old 9/3/13, 7:42 PM
Harrison Cheung Harrison Cheung is offline
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Default

So if you guys see this algae on roofing, will you recommend replacing the roofing or cleaning? How do you write it up?
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  #8  
Old 10/10/13, 11:23 PM
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Kenton Shepard, CMI Kenton Shepard, CMI is offline
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Default Re: marks on roof shingles

Quote:
Originally Posted by Harrison Cheung View Post
So if you guys see this algae on roofing, will you recommend replacing the roofing or cleaning? How do you write it up?
Mike's post #2.
Ugly, but generally not a big deal. It will retain moisture longer as it gets thicker, which isn't good for the roof, but mostly a cosmetic issue.
Slippery when wet!




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