Proper chemicals?! Just use a 50/50 bleach solution with a garden sprayer.I very seldom advise people to not do a project themselves but this is one item best left to the pros. Why? Because they have the proper chemicals and pressure equipment to do the job right without damaging the shingles. They will be able to do the job without killing all the plants and grass. Be sure to get references and preferably hire someone with several years experience.
I done this at least 10 times on asphalt shingles, never had an unintended consequence. Actually, I learned this from a professional roof cleaner. If you want to win some, you have to risk some. Ornamental plants?! Get them out of the way.Billy, that will work but you also run the risk of killing ornamental plants with the overspray and runoff. You can also cause discoloring of paints and stains. There are a number of unintended consequences to consider before beginning any job. You also have to consider that these are shingles and not tiles. Roofers just love do-it-yourselfers that weaken their shingles with harsh chemicals and then get up there and blow the stone layer off the shingles with a pressure washer.
yes! this is the way. we used a chemical solution from amazon and the roof cleaning wire brushes from https://roofscraper.co.uk/ was a fairly simple process. the local roof cleaning company wanted £1,200 to clean and apply a chemical so that wasn't really an option for us.Don't make this harder than it needs to be. You don't need to hire a professional or roofer unless you have a lot of money or afraid to get on a ladder. I've done it on several roofs. Don't let anyone scare you. Your roof will not melt nor will exposed wood or paint. 50/50 bleach will not hurt anything except micro organisms and moss. Wear gloves if you don't like bleach water on your hands and clothes you don't care if get splashed by the bleach solution.
Solution: Get a two gallon garden sprayer ($15). Fill it with one gallon of regular BLEACH (<$2) and one gallon of water. Spray the roof on a warm day top to bottom. In minutes, the green moss turns yellow- brown. Moss is dead. Don't pressure wash or rinse. Let the rains wash the dead moss away. You will never know it was there after a few rains.
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