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What is the best way to remove algae from an asphalt roof?

Power wash with water only
18%
Power wash with a chemical mix
58%
Hand scrape and scrub
8%
It is not advisable to remove algae
9%
Not sure
5%
Next Question
Question: What is the best way to remove algae from an asphalt roof?
Top Answer (58% of 97 votes): Power wash with a chemical mix.

Answer: Power wash with a chemical mix
Explanation: Chemical,s & Low Pressure Wash & Rinse
Rays Professional Exterior Cleaning & Restoration
Answer: Not sure
Explanation: Soft wash with a soft wash company like Pioneer Soft Wash
Suburban Home Improvements
Answer: Power wash with a chemical mix
Explanation: You can you a soft wash solutions to clean your roof system
Guidry Professional Roofing LLC
ProMatcher
Answer: Power wash with water only
Explanation: Safety Working on a roof can be dangerous, and it becomes even more hazardous when wet, so be sure to take adequate safety precautions. Avoid working on steep roofs, wear slip resistant shoes, and use a safety rope where needed. When working with harsh chemicals, be sure to protect your skin and eyes. Bleach can damage or kill other plants in addition to algae, so wet down any grass, shrubs, or other plants where runoff will occur before and after applying bleach. Covering bushes with plastic after wetting them down helps as well. Cleaning It’s best to clean your roof on a cloudy day to prevent the cleaner from evaporating too quickly. If you know the manufacturer of your shingles, contact them or check their website for specific recommendations on cleaning. When using a product made for cleaning roofs or oxygen bleach, follow the directions on the container. While the recipe for cleaning a roof with bleach can vary, the basic formula is: 1 quart bleach (6% sodium hypochlorite) 1 gallon water 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)
Michael's Roofing
Answer: Power wash with a chemical mix
Explanation: chemical clean is the only way to remove algea from shingles. pressure washing will cause to much damage.
Benitez pressure washing
Answer: It is not advisable to remove algae
Explanation: Using a zinc plate at the top of the roof can prevent and eliminate algae but using GAF shingle products there is no worry that this will happen as they warrant against it.
Aci Exteriors LLC
ProMatcher
Answer: Power wash with a chemical mix
Explanation: There are a variety of eco friendly chemicals in the marketplace to deal with algae growth on asphalt roofing material. Some do not require pressure washing while others do. Pressure washing with chemicals offers immediate results while chemicals alone rely on rain fall over time to remove algae.
J. Edmund Construction
Answer: Not sure
Explanation: use chemical mix not power wash
allstate exteriors & restoration services
Answer: Power wash with water only
Explanation: If we were to recommend cleaning your roof we would recommend it be done with power washing it at low pressure.
Moda Roof and Fence Company
ProMatcher
Answer: Hand scrape and scrub
Explanation: It is generally safer to scrape and scrub gently with a push broom than to power wash because high water pressure may damage the asphalt shingle.
Russ Construction & Remodeling LLC
Answer: Power wash with a chemical mix
Explanation: make sure manufacturer allows the product
American Home & Environmental
Answer: Power wash with a chemical mix
Explanation: An asphalt roof can be damaged with a power washer. Instead, we use a high pressure hose with an algae killing agent.
CWAGS LLC
ProMatcher
Answer: Hand scrape and scrub
Explanation: Never powe wash. It will ruin the shingles. They need to be cleaned with mild water and cleaner to save the life of the shingles.
ENCORE ROOFING, LLC
Answer: Power wash with a chemical mix
Explanation: always call a professional
All of Texas Roofing
Answer: Power wash with a chemical mix
Explanation: should be done by a reputable pressure washer
G M M Property Inspections
ProMatcher
Answer: Power wash with a chemical mix
Explanation: Not really right answer but an organic chemical mix and a low pressure wash is the best way to remove algae
Grace Roofing
Answer: Power wash with a chemical mix
Explanation: The above answers don't list the correct answer. Power washing is not recommended as it could easily damage the roof. Applying an algecide to kill and loosen the algae is done first. The roof is then washed with tap water at increased pressure to wash away the algae and moss. Most algecide shave the ability to prevent the growth of new algae and moss for a period of time.
JDM.Services
Answer: Power wash with water only
Explanation: Algae is common on older roofs. I you do decide to try and clean it off, try a spray and then gently hose your roof surface, Do not, I repeat, do not use a power washer unless you're using it on a very low/rinse setting. You can damage the aggregate on the shingle surface if it is an asphalt surface. There are many different methods to remove algae from other roof surfaces that you can google.
Whittington Construction Co
ProMatcher
Answer: Power wash with a chemical mix
Explanation: Low pressure chemical algaecide and surfactant. The low pressure is like a garden hose with a misting nozzle.
Sterling House Wash
Answer: Hand scrape and scrub
Explanation: As I stated, moss will damage the roof, but algae removal is mostly for aesthetic purposes. If done, non-toxic oxygen bleach should be used, mixed with water and carefully and gently scrub the surface in the direction of the water flow.
1st Choice Building Co
Answer: Power wash with a chemical mix
Explanation: Always use the proper algaecide and cleaning detergents to clean a shingle roof. This solution is applied and rinsed away using low pressure. High pressure should never be used on a shingle roof.
Wash-It Services
ProMatcher
Answer: Power wash with water only
Explanation: Removing algae from a asphalt shingled rooftop can usually be done with a simple power wash. Using chemicals or scraping the roof is not usually advised due to the fact that you may compromise the durability of the shingle with certain harsh chemicals.
800-RAPID-51, Inc.
Answer: Power wash with a chemical mix
Explanation: Wash to get the existing algae off, certain cleaners that have the zinc in them needed to really get the job done. If I'm not mistaken these products can be bought at your local hardware store.
Roofing By McCallister
Answer: Power wash with a chemical mix
Explanation: Low pressure wash with an algae remover.
Team Texas Construction, LLC
ProMatcher
Answer: Power wash with water only
Explanation: We dont like to use chemical because were care about our environment
Am Star Roofing
Answer: Power wash with a chemical mix
Explanation: It's best to research per manufacturer for the correct chemical mixture.
Kulp Roofing, Inc
Answer: Power wash with a chemical mix
Explanation: The best practice is to use low pressure with the necessary detergents. It is important to not force the algae off the roof. Remember, use caution when using ladders and wear proper PPE when using chemicals.
Patriot Pro Clean Inc
ProMatcher
Answer: Power wash with a chemical mix
Explanation: low pressure only using a mix of water & biodegradable eco-friendly non-bleach solution
Bavarian Window Cleaning
Answer: Power wash with water only
Explanation: Although there are many products out that say they are algae removers, Plain water and a power washer work just fine ,just be carefull not to use too much pressure as you can damage your roof! A mild to low pressure can usually remove algae rather easily.
Expert Construction
Answer: Hand scrape and scrub
Explanation: Can cause shingles to curl up and split seams where water can find its way in.
Gibson Gutters Inc
ProMatcher
Answer: Power wash with a chemical mix
Explanation: Note, the answer was not mentioned to pick on this question, for you do not use pressure washers or scrap off algae!!!! I put not sure for the other answers were wrong! Would not allow me to not pick one. Do not ever power wash or scrap a roof, for you will wash or scrap off important granules, there are products at building material stores that you can buy, that you can use a pump sprayer or granules as well, to kill the Algae or moss, then just use a garden hose, without the nozzle, after applied by directions, and it will wash it off. Moss growth you need to kill with products designed for it and it kills and destroys the root base and usually rain will wash it off. Another thing, if you can reduce shade to the areas that have this, do so, for that is the main cause. Remember, there is a cause and a effect for everything.
Todd Professional Home Inspection Services, LLC
Answer: Power wash with a chemical mix
Explanation: The pressure washer must have a low pressure setting, and the proper chemicals should be used.
Genn-USA Pressure Washing Services
Answer: It is not advisable to remove algae
Explanation: There are biodegradable products specifically designed to remove algae.
East Coast Home Inspections LLC
ProMatcher
Answer: It is not advisable to remove algae
Explanation: Most of the plant life on a roof is moss, not algae.
Leak Seal Roofing Inc
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