Dark Streaks on Roof


  #1  
Old 11-16-05, 07:07 AM
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Dark Streaks on Roof

There is one section of our roof that has long dark streaks. Although it is on the north side of the house, the other north side section that is more in shade and under trees does not show the streaking nor do any other sections of the roof. This part of the roof (we were told) is the newest..maybe 10 years old.

Does the streaking signify some sort of problem that needs to be addressed? Does it mean that the roof is nearing the end of its functional life? After those issues are addressed is there something I could (or should?) do to take care of the streaking for both aesthetic reasons and for the longevity of the roof ie. cleaning or zinc strips?

One of the reasons I have become hiper focused on the streaks is because we are getting estimates on leaks around the chimney and valley on another part of the roof. My concern is if the rest of the roof is failing I am not sure it is efficient to do the repairs on just the one section of the roof. The entire roof is 3 tab asphalt shingles but the age of roof, as I said, is different for differnet sections. And, the part with the streaks has a steep pitch while the part that is leaking is very flat.

Any thoughts would be appreciated. Thanks.

Mark
 
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Old 11-16-05, 07:52 AM
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Dark Streaks on Roof

The dark streaks are usually more of a cosmetic problem (not always). there are number of different, but sililar causes. Sometimes is just the dead algae that shows up black. The causes seem to vary with exposure and slope. The cleaning and zinc usually do a good job.

One thing to look at in assesing you roof as you decide what to do with it is the number of layers of roofing in place. It sounds like your roof has a number of different areas and conditions and possibly a different number of layers. Some of these will age much faster, even though they may look OK now.

Sooner or later you may be looking at a complete tear off. It is good that you are looking at things in advance and planning.

Dick
 
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Old 11-17-05, 10:41 AM
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Thanks much for your response!

Mark
 
  #4  
Old 11-17-05, 04:12 PM
Lowongas
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Many of the shingle made today claim to be algea resistant.We'll see!
 
  #5  
Old 11-17-05, 07:40 PM
dougger
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Most of the "algea warranty's" cover from 10-15 years.
 
 

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