After initial light snowfall in the Northwest, residents are bracing for a major storm to move through the region Tuesday night that is expected to drop significant amounts of snow, according to the National Weather Service.

Seattle could receive as much as 16 inches of snow by Wednesday, according to the National Weather Service. The Weather Channel notes that Seattle’s annual snowfall is just 5.9 inches.

The above-average amount of snow for the region could lead to roof damage for properties not ready to hold large amounts of snow. Inspect your roof and prepare for large amounts of snow by using the following guidance offered by the Insurance Institute for Business & Home Safety.

Preventing roof collapse

If your roof is damaged in any way it is critical to try to address the issue before significant snowfall occurs. If there is no damage, the typical roof should have the ability to support 20 pounds per square foot of snow before the weight starts to become too much, according to the Insurance Institute.

Determine how much the snow on your roof weighs by following the guidelines below:

Fresh snow: 10-12 inches of fresh snow = 1 inch of water = 5 pounds per square foot

Packed snow: 3-5 inches of packed snow = 1 inch of water = 5 pounds per square foot

Ice: 1 inch of ice = 12 inches of fresh snow = 5 pounds per square foot

If snow buildup begins on your roof, don’t waste time to remove it. Use a snow roof rake that is long enough to remove snow with you on the ground, or hire a professional contractor to remove the snow.

For additional snow removal guidance and other freezing weather resources, visit the Insurance Institute for Business & Home Safety’s DisasterSafety.org.