If the black stains are only on a few shingles, the simple fix would be to replace the discolored ones with new shingles that match. If you roof is newer, then it is possible that the company that installed the roof left you a few extra shingles. This would be ideal since replacing the damaged shingles would result in a perfect match.
The next best thing would be if you have a receipt or record of the brand and color of the shingles. You could then go to the supplier and purchase the matching shingles. Keep in mind that even buying the exact matching shingles can look slightly different then what's on the roof because of the age of your current shingles and the die lot of the new shingles.
Still, the match should be pretty close.
Over time, as with all manufacturers, products are discontinued and if this is the case with your roofing shingles, then there are a few other things you can try to still make the repair look good.
Your options then would be to try to find the closest match available, and they may look just fine, or take shingles from another area of the home where the shingles are less visible and use the old shingles in the spots where you need to replace the bad ones and then install the new shingles that don't match as well in the spots where you took the old shingles from.
Depending on large of an area is affected by the problem; you may have to at least replace and entire section of shingles on the roof to get it to look right.
Now that you have a good idea on what it takes to solve the problem with removing and replacing the bad shingles, there are also some methods of cleaning that might just do the trick.
One of the suggestions out there that have been used for years is to get a garden sprayer and mix a 50/50 solution of water and bleach and spray wash the roof to get rid of the algae. Keep in mind that a garden sprayer is not a pressure washer. Do not use a pressure washer because you can blow the surface of the shingles right off the roof and thus damage the shingles.
Of course we want to keep the environment in mind especially if you have a lot of plant life growing around the home. If this is the case with your home then you would want to use one of the deck cleaners that are safe for the environment and ones that won't cause damage to foliage. Products containing oxygen bleach clean well and will not harm the plants. Anytime you can use a product that is good for the environment, the better off you are.
Today there are some great products available, now there is a great new roof cleaning product called Roof OX 3000 that uses the Oxygen Cleaners and you can get a complete cleaning system that includes the roof cleaner and stain prevention product along with a hose and garden sprayer.
In 2007, Rick Maselli founded RTM Directories Inc. and as president of this company his goal is to help the do-it-yourself people out there to have a one stop home improvement resource and that resulted in his new website, http://www.showroom411.com
Showroo411.com is Your Ultimate Home Improvement Resource which is free to the public and reflects all the hard work that Rick has put into to being a building Pro.
You can also read his reviews on many new and innovative building and high tech products in his blog, http://www.leveladvice.com
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