Get Rid of Mold on Roof Shingles

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Get Rid of Mold on Roof Shingles

I have often heard the question on what to do about mold growing on my roof shingles? How do I get rid of mold on my roof shingles? How do I keep mold off my roof shingles?

Well, the answer is that mold and mildew stains typically grow on asphalt shingles and more so in hot tropical climates where high levels of humidity are common. Mold can damage your roof. Roof mold and mildew stains decrease the roofs shingles ability to reflect the sun. This will cause an excessive heat buildup and premature aging of the roof shingles.

Never use a pressure washer on an asphalt roof shingles. You would be better of the leave the mold intact. The high pressure water will dislodge the granules damaging the roof shingles and causing premature aging.

There are commercial roof cleaning companies that use commercial roof cleaning products. Make sure that the company is not using a product containing hydrogen peroxide. Some commercial applicators may be using products containing hydrogen peroxide. Hydrogen peroxide has been shown to breakdown asphalt roof shingles shortening their life span. The best way to get rid of mold and mildew on a roof is to do it yourself.

Step 1: Safety first, a proper ladder will be required. Never go up on a roof alone. Make sure there is someone on the ground in the case of an emergency. Remove large pieces of mold or moss by hand.

Step 2: Mix a solution of chlorine bleach and water at a mixing rate of 7 parts water to 1 part chlorine bleach.

Step 3: Spray the mixture of chlorine bleach lightly with a garden sprayer over the entire roof and effected areas (DO NOT USE A HIGH PRESSURE WATER SPRAYER). Wait 15 minutes and rinse lightly with a water hose (DO NOT SPRAY ROOF WITH WATER HOSE).

Step 4: Allow surface to dry. Apply an EPA approved mold and mildew fungicide with a light garden sprayer. Do not use heave pressure applications, this can damage asphalt roof shingles. Follow the direction label provided with any mold or mildew product. Allow the product to remain on the roof the recommended “kill – time”.

Step 5: Rinse the roof off with a water hose applying the water lightly. Remember NOT to spray the roof shingles with a direct stream of water.

Consider removing overhanging trees. This will eliminate tree sap and other debris from building up on the roof and in the gutters. Be careful when working on a wet slippery roof. Warning: Remember mold, mildew and fungus can be slippery when wet.

By: Bradley Skierkowski

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