12-01-2006, 11:11 PM | #1 (permalink) |
Crazy
Location: Music City burbs
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Black marks on roof
I know this is a one answer thread, but I'm dying to know what causes the black marks on the roof, the one that looks like a black dirt bomb has been dropped....
It's sad to see such a nice looking house and a good roof, but there's just that little droppped-bomb look. What is it? What causes it? Can it be gotten rid of?
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(none yet, still thinkin') |
12-02-2006, 05:22 AM | #2 (permalink) |
Mulletproof
Location: Some nucking fut house.
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I'd bet it is algae.
Check this link: http://www.naturalhandyman.com/iip/infxtra/infroo.shtm or this one: http://www.thisoldhouse.com/toh/tvpr...401167,00.html
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Don't always trust the opinions of experts. |
12-02-2006, 07:49 PM | #3 (permalink) |
Psycho
Location: Where the night things are
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I'm going to say it's mildew. Strips of zinc placed below the ridge will release zinc oxide and inhibit further growth-you've still got to clean off the existing crud.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy |
12-02-2006, 09:44 PM | #4 (permalink) |
Adequate
Location: In my angry-dome.
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Is it just random patches, or near roof ventilation? If random I'd third the fungus thing. Is the roof ventilated? Attic conversions without adequate venting can promote growth of junk. Do you see signs of moss?
If the dark spots are around vents it could be smoke damage. Usually also shows up around the soffit vents.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195 |
12-08-2006, 02:30 PM | #6 (permalink) | |
Junkie
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It could be a number of things. The most likely culprit is tree sap. Are there any trees hanging over the roof? Especially ELMS. Those trees are beautiful but they suck. My neighbor has two monstrous elms hanging over our houses. My roof looks like it's been in a fire.
The next culprit is mildew or algae. But, if you're getting plenty of sun then you probably don't have that problem. Quote:
Just to be sure, we are talking about the roof (exterior) and not the ceiling (interior) right? |
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12-16-2006, 08:58 AM | #8 (permalink) | |
Upright
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Quote:
Try spraying first with a water and bleach mix (5 parts water 1 part bleach). If results don't ocur within half an hour increase to 3:1 then 2:1. The bleech should kill the mildew/moss and dry it out. Later you should be able to hose it off or if necessary sweep it off. |
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01-03-2007, 06:23 AM | #10 (permalink) |
pinche vato
Location: backwater, Third World, land of cotton
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Here's another roof-related question. We have a large limb that has fallen on our roof and it is propped up by some electrical line. Part of the limb is on the roof and part of the limb is on the electrical line. How can I tell what type of line it is and whether or not I can move the limb myself without getting fried?
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Living is easy with eyes closed. |
01-03-2007, 10:13 AM | #11 (permalink) |
Mulletproof
Location: Some nucking fut house.
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It's usually pretty easy to follow the wire back and determine if it is cable TV or incoming power. Also the cable TV will be one thin black cable usually and the power will be three cables twisted together with one of them most often uninsulated.
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Don't always trust the opinions of experts. |
04-08-2011, 10:52 PM | #12 (permalink) |
Banned
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aloha.
i think black marks on your roof is the same with black algae, it is a stain occur on a asphalt shingle roofs.The roof algae starts as dots, then takes a cone shape and can eventually cover your entire roof! Introduce copper or zinc strips to kill roof algae. You can also use Oxygen Bleach.
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black, marks, roof |
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