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To keep your PVC roof in top condition, keep it clear of debris, ensure drainage systems are working properly, and inspect it for damage regularly. Keeping the roof clear of ponding water, sharp debris, and other hazards will prevent damage. Have your roof inspected by a professional once a year to ensure the seams aren’t damaged or separated—faulty seams can lead to destructive water intrusion.

You could void your roof warranty using a power washer if you have a newer roof. With an older roof, you could knock loose older shingles. On the other hand, some people safely use a pressure washer to remove moss from a metal roof. Although you may want to use a pressure washer, the truth is that you probably don’t need it to knock moss loose. A garden hose and brush will do the job just fine and in a safer manner than a pressure washer.

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.

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.