Q:

What is the bleach to water ratio for cleaning roof shingles?

A:

Quick Answer

A solution of equal parts bleach and water safely cleans asphalt shingles, according to the Asphalt Roofing Manufacturers Association. The diluted bleach cleans most effectively when applied with a pump sprayer and left on the shingles for 15 to 20 minutes.

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Full Answer

Another way to clean shingles with bleach is to combine 1 gallon of water with 1 quart bleach and 1/4 cup trisodium phosphate, according to Today's Homeowner.

It is very important to rinse the shingles before the bleach solution dries, notes the Asphalt Roofing Manufacturers Association. A garden hose is the best tool for this job, as pressure washers can damage asphalt shingles.

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