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While removing every snowflake from your roof is unnecessary, you should remove a significant buildup of snow. Since snow is wet and heavy, it can easily cause damage to your roof, which can lead to needing costly repairs. 

Additionally, when the snow melts but has nowhere to go and refreezes, it can create an ice dam, causing mold concerns due to water leaking into your attic and ceiling. For these reasons, it’s best to hire a snow removal professional to clear heavy snowfall from your roof as soon as possible.

Generally, snow removal from a roof should occur once over six inches of snow accumulates, especially if you notice that ice dams have formed. Without ice dams, you can let the snow accumulation hit 12 inches before removing it. However, the amount of snow that is too much for your roof also depends on the sturdiness of your roof and the compactness of the snow. If your roof needs maintenance or has structural issues, it’s best not to let the snow accumulate too much for fear of collapsing.

Other than it looking like a dirty car, there are some other signs you need to clean your roof. Moss growth, algae (often black streaks), grime buildup, buildup under shingles, and leaf buildup are all classic signs a cleaning is overdue. If you have neighbors, take a look around. If your roof appears different in any way, that’s another sign to call a pro to have it cleaned.

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.