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

Power wash with water only
19%
Power wash with a chemical mix
58%
Hand scrape and scrub
8%
It is not advisable to remove algae
10%
Not sure
5%
Next Question
Question: What is the best way to remove algae from an asphalt roof?
Top Answer (58% of 100 votes): Power wash with a chemical mix.

Answer: Power wash with water only
Explanation: You can power wash it with water only as some chemicals would cause discoloration in the shingles
T&K Remodelers
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
ProMatcher
Answer: Power wash with a chemical mix
Explanation: water will only clean the surface you have to get it with chemical to completely kill the algae
New Era General Construction
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
ProMatcher
Answer: Power wash with a chemical mix
Explanation: Best with power washer set at reasonable setting to protect asphalt and nonaggressive chemical.
G&G Handyman Services
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
ProMatcher
Answer: Power wash with a chemical mix
Explanation: Use a good quality roof cleaner and light power wash rinse.
Applied Coatings Solutions, LLC
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
ProMatcher
Answer: Power wash with a chemical mix
Explanation: None of the above! But yes chemicals should be used and then rinsed. Bleach mix is the most common and effective.
Mallett Pro Wash
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
ProMatcher
Answer: Power wash with a chemical mix
Explanation: The most effective method of cleaning algae and moss from a roof is with a 50:50 mix of laundry strength liquid chlorine bleach and water. Apply with a sprayer and allow the solution to dwell on the roof surface for 15 to 20 minutes, and then rinse thoroughly with low pressure water. Do not let the mixture dry
MRG Painting & Projects
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
ProMatcher
Answer: Power wash with a chemical mix
Explanation: it can be done by low pressure and chemicals but the best way is done by installing zink strips under the ridge on older roofs as the newer shingle roofs come zink impregnated to stop the spread of algae
metal masters construction.llc
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
ProMatcher
Answer: Not sure
Explanation: Removing the algae on a homes roof is not done by a home inspector
Gold Country Inspections
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
ProMatcher
Answer: Power wash with water only
Explanation: Don't ener put chemicals on your roof
Todd's Roofing & Siding
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
ProMatcher
Answer: Power wash with a chemical mix
Explanation: Our roof cleaning process involves a LOW PRESSURE application of a specialized mix of detergents that prevent -- infestations from returning for much longer periods of time than other methods . We do not use power washers in the process
SPOTLESS ROOF & EXTERIOR CLEANING
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
ProMatcher
Answer: Power wash with a chemical mix
Explanation: shingle roofs vary from age to age? it really depends on the life of the roof shigles and their guarantees?
colorful homes inc.
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
ProMatcher
Answer: Power wash with a chemical mix
Explanation: This is not advisable unless its done by a licensed contractor. Power washing removes the granular coating that protects the asphalt. It mat look pretty when its done, but the damage will soon surface from the lack of granules, Installing a zinc strip helps to kill off algae.
Exterior Systems Roofing
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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