cleaning roof shingles

Old 03-20-04, 06:05 PM
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cleaning roof shingles

Can anyone recommend a safe way to remove green tinge on shingles in a shady spot on my roof? I am worried about damaging the asphalt roof shingles that are only about 5 years old.
Old 03-20-04, 06:24 PM
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Location: N. E. Illinois
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get a pumpup sprayer add a mild bleach solution like 1 part bleach to 15 parts water, spary it on evenly then rinse with hose. But the big thing is to find out what is causing the mold to grow, the roof is not drying out, a shaded side is not a good enough of a reason. mold is very slick, so dont walk on it. I am sure there are other ways but I just of after spraying on the bleach water use a paint roller with a long nap to roll the stuff around use an extension pole (like the kind they have to put up x-mass lights up on taller trees
Old 03-21-04, 08:44 AM
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I have heard that suggestion before but was concerned that the bleach mild as it maybe would damage the shingles. Have you tried this before and gotten good results?
Old 03-21-04, 01:48 PM
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I use chlorine all the time here dont hurt the shingles at all. Get a Ortho hose spray and but it on the hose set for 8 oz fill it with the chlorine and go at it. here we use pool chlorine for this .What you buy like clorox is only 5% or 6% the pool chlorine is 10%. Does a lot better job. Just put it on and forget it till the next time ED
Old 03-21-04, 04:05 PM
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You can use bleach on your roof. The stronger the solution, the better it will work. However, the most common suggestion is 1/3 bleach, 1/3 water, 1/3 TSP (detergent). There are also some solutions already prepared. I am most familiar with SHINGLE SHIELD by Chicago Metallic. Check with your local shingle retailer to see if you could get some. I think Chicago Metallic has a website.


Bleach and foliage do not mix well. Be sure to water down all of your plants, grass, shrubs, whatever, both before and after you treat the roof. (Wherever you have runoff)

A common practice is to put the solution in a garden or other LOW pressure sprayer, soak the area needing treatment, wait 15 minutes or so, then rinse it off. It may take more than 1 treatment, depending on how bad the algae is.

You could/should then put a copper or zinc strip at the top of your roof because the mold/fungus/algae WILL come back. The average return after cleaning is around 2 years. This copper/zinc strip will keep the fungus from returning for awhile. There is also zinc strip made by Shingle Shield as well.

Zinc strips and copper strips will perform the same function.

If you want to spend some money, there are businesses that clean roofs and give guarantees.

Good luck.
Old 03-24-04, 05:22 AM
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Thanks for your help.

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