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Leaving a significant amount of snow on your roof can be risky. Most roofs are designed to handle about 20 pounds per square foot of snow, but exceeding this limit can lead to a roof collapse. A collapse can cause severe damage to your home and belongings and poses a physical danger to anyone inside. Furthermore, heavy snow accumulation increases the risk of ice dams, which can cause leaks and water damage to your roof, attic, and interior walls.

Clearing snow from your roof can be a tedious and time-consuming job. Even so, it is extremely important to maintain your roof during the winter months. You can help prevent ice dams and avoid roof collapse.

As a side note, rather than shoveling your roof, you should always use a roof rake to modify the job. Otherwise, call in a professional.

It may require stronger cleansers or chemicals, higher-pressure spray, or scrubbing to completely remove algae from a metal roof. Start with a mild cleanser; if that doesn’t work and you're comfortable doing so, use a stronger mix of ⅓ cup of laundry detergent, 1 quart of bleach, and 3 quarts of water to gently scrub the algae with a soft-bristled brush. If algae is present across large portions of your roof, doesn’t come off with gentle scrubbing and cleansers, or is in hard-to-reach areas, this may be a job better left to a pro.

Ideally, you will tackle removing algae from your roof during spring or summer when the weather is drier and warmer. Because algae tends to grow during the colder and wetter months, you want to tackle this project before the temperature drops to hopefully keep it from coming back at all.