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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
56%
Hand scrape and scrub
7%
It is not advisable to remove algae
10%
Not sure
4%
Next Question
Question: What is the best way to remove algae from an asphalt roof?
Top Answer (56% of 102 votes): Power wash with a chemical mix.

Answer: It is not advisable to remove algae
Explanation: It’s not advisable to use any mechanical method (be it pressure washer or scraping) to remove algae growth from a roof. A professional roof cleaner would only use recommended chemicals to treat the roof and rinse with low pressure (under 300psi)
Cooper Pressure Wash & Exterior Cleaning
Answer: Power wash with water only
Explanation: Soft washing is the best methon
IC Cleaning Services
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
ProMatcher
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
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
ProMatcher
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
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
ProMatcher
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
Answer: Power wash with a chemical mix
Explanation: Use a good quality roof cleaner and light power wash rinse.
Applied Coatings Solutions, LLC
ProMatcher
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
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
ProMatcher
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
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
ProMatcher
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
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
ProMatcher
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
Answer: Not sure
Explanation: Removing the algae on a homes roof is not done by a home inspector
Gold Country Inspections
ProMatcher
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
Answer: Power wash with water only
Explanation: Don't ener put chemicals on your roof
Todd's Roofing & Siding
ProMatcher
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
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
ProMatcher
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
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 Painting And Restoration
ProMatcher
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
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
ProMatcher
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Related Questions

Is it harmful to pressure wash an asphalt shingle roof?Top answer: Yes

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What is the best way to remove algae from a tile roof?Top answer: Pressure wash with a water chemical mix

Is it advisable to power wash a wood shingle roof?Top answer: No

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