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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.

The average cost to clean a roof is around $500, but prices can fall between $150 to $1,000 or more. The size and complexity of your roof are the most significant cost factors, as larger roofs and those with various bump-outs and gables will increase your cost. Your roof material will also make a difference. An asphalt roof will require more labor, as your professional will need to be careful not to damage the shingles. A metal roof can stand up to more intense scrubbing and shouldn’t take as long to clean.

Clay tile roofs require minimal maintenance, as they stand up very well to the elements and often won’t fade in direct sunlight. They also don’t need sealing. Concrete tiles are also relatively low maintenance, but you will need more maintenance than with clay. You’ll need to seal concrete every few years to improve water resistance, and the color will fade a bit more quickly than with clay.

For most people, summer is the best season to clean roof shingles. You want a day with dry weather and comfortable temperatures. In hot climates, late spring may work better for washing shingles. Avoid cleaning roof shingles at any time where ice could form from applying water in low temperatures.