If youre unlucky enough to experience an ice storm or freezing rain this winter you definitely want to watch your roof carefully. Generally most residential roofs should be able to support 20 lbs of snow per square foot of roof. Roof Pitch For Snow Snow Load Roof Pitch A To Z Roofing For most roofs the duration of a snow load is brief. . However if your roof already had 30 of snow on it left from several previous storms that 4 of snow could be the straw that breaks your structures back. Your roof can only hold 2 feet of packed snow and 4 inches of ice. If you went to a 40lb-snow load and kept the roof pitch at 4-12 your roof would be able to hold 8 feet of wet snow. However a roof thats got a shallow pitch or is flat is at risk of damage or failure from roof snow. For non-commercial agricultural buildings snow load designs can range from 12 to 40 pounds per square foot. Todays storm may only drop 4 of snow. ...
