Can You Use the Krud Kutter on a Roof?

Algae and Moss

• While algae and moss don't damage your roof, they are unsightly and trap water, which damages roofing materials. These organisms have shallow root systems and are easily removed with a good cleaner and a stiff-bristled scrub brush mounted on a pole. Always brush downward to remove roof organisms, as brushing up can damage your shingles. Black algae is harder to remove than green algae.

Application

• Krud Kutter House Wash is a concentrated solution containing no ammonia or bleach. It comes in a 32-ounce hose-end sprayer or a 1-gallon bottle. To use the hose-end sprayer, turn the valve to "off" and attach the garden hose to the sprayer. Turn on the water to the hose, then turn the valve to the "rinse" setting. Wet the roof from the top down, then turn the valve to the "clean" setting. Apply the cleaner to the roof and allow it to sit for 10 minutes, then use a scrub brush attached to a pole to loosen the algae and moss. If all the organisms are not removed, it may be necessary to repeat the process. The 1-gallon size is intended for use in pressure cleaners. Mixing directions are provided on the label.

Ingredients and Safety

• The two active ingredients in Krud Kutter House Wash are sodium metasilicate pentahydrate and alcohol ethoxylate. According to the Material Safety Data Sheet, the inhalation danger is low, but it may cause temporary eye irritation or skin irritation in sensitive individuals. It is not listed as an ingestion hazard, and overall it is classified by the Occupational Safety Hazard Association as nonhazardous. No special handling is necessary.

Preventing Roof Moss and Algae

• To prevent moss and algae buildup on your roof, keep all leaves and other organic debris off the roof. Removing overhanging branches to allow sunlight to reach your roof prevents these organisms from growing.