density of water =
= 1 gram per cubic cm
= 0.036 pounds per cubic inch
1 cubic meter of water weighs 1,000 kilogram
1 cubic foot of water weighs 62.43 pounds
Parameters:
(1) surface area of roof in square feet
(2) thickness of snow layer in feet
(3) density of snow relative to water (snow has a lower density than water or ice)
NOTE: In the calculations it is assumed that all of the material on the roof is present as a uniform type of snow.
area of roof in square feet =
= (length in feet) * (width in feet)
volume of snow in cubic feet =
= (depth in feet) * (area of roof in square feet)
weight of snow in pounds per cubic foot =
= (density of snow in pounds per square foot) * (thickness in feet)
weight of snow on the roof in pounds =
= (density of snow in pounds per cubic foot) * (volume in cubic feet)
|
Type of Snow
|
Density as Percent of Water
|
Density in Pounds per Cubic Foot
|
|
very light and dry
|
5%
|
3
|
|
wet snow
|
33%
|
21
|
