Cleaning Mold Off Asphalt Shingles

These stains will discolor your roof and damage the shingles over a period of time if left alone.

Cleaning mold off asphalt shingles.

Never use a pressure washer to wash or rinse shingles. But that would only make sense if the shingles were worn out. Let the mixture sit on the roof for 20 minutes before you rinse it off. For large expanses of an asphalt shingled roof use a long handled scrub brush made for cleaning gutters and roofs.

The concentrated jet will scrape off the small pebbles on top of the shingles and reduce their water repellency which will only make your mold situation worse. How to clean roof stains wash your shingles where the sun doesn t shine. Moss will loosen over time and may be removed with a leaf blower. The mild chemical reaction caused by rainwater coming in contact with the zinc inhibits the growth of mold and mildew.

Asphalt shingles are designed to withstand rain not the force of a power washer. Never use a pressure washer to clean an asphalt shingle roof as this w ill cause granule loss and very likely premature failure of the roof system. Mold stains can form on roof shingles that are in permanent shade. A pressure washer can eradicate the moss from the deep crevices and prevent it from returning next season.

You could replace all the roofing with new shingles dark enough to disguise the staining or with shingles laced with copper granules which are lethal to algae. Don t use a pressure washer to apply the cleaning agent. Do shingles on your north west or other shaded roofs have streaky moldy stains. Not to worry though because you can clean the mold off with basic household bleach and save your roof long before you need an expensive replacement.

1 4 cup tsp trisodium phosphate or other heavy duty cleaner don t use a cleaner that contains ammonia or is not recommended for mixing with bleach as it can result in poisonous chlorine gas pour the ingredients into a pump type garden sprayer mix well and spray. Extensive mold growth can also expose the interior of your attic or crawlspace to mold spores carrying the problem over to the inside. Instead gently pray the roof down with a mix of half bleach and half water. If you have a consistent problem with mold growth on your roof consult a roofing professional.

Power washing your roof will reduce its lifespan. Installing zinc strips under a row of shingles near the ridge of the roof will prevent mildew from forming. Step 3 applying asphalt roofing shingles containing a copper additive in their surface granules is an option. Here s how to clean the.

The less expensive solution is to spray wash the roof with a 50 percent mix of water and bleach to get rid of the algae. In severe cases it may take more than one bleach treatment to kill all of the moss. Doing so can damage your asphalt shingles.