The ground snow load varies. Use the free snow load calculators at Jabacus (related link) to find the snow load for a specific location.
A 4-12 pitch with a 30lb snow load will hold approximately 6 feet of wet snow. 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. We don't get that much dry powder in New England...:)
Surface area of the roof times depth of snow gives volume of snow. Take a sample of snow and weight it to determine density (since the density of snow can vary quite a bit). Density times volume equals weight.
In bridge construction dead load, live load, and dynamic load must be considered. Dead load is the weight of the bridge itself. Live load is the moving weight on the bridge. Dynamic load comes from outside forces like wind and vibrations.
They don't do anything to a person's weight. What they do is allow what weight there is to be spread over a greater area, which means that the pressure on the ground is lower. With less pressure, a person doesn't sink as far into the snow.
It is a "LIVE LOAD" which is the weight of snow for which a roof is designed for. It is usually 40 lbs. per square foot. Al dead load is the weight of the roof structure itself.
Dynamic Load The "load" is the total force and weight that a structure such as a bridge is designed to withstand. For a bridge, the total load includes the "dynamic" loads of traffic, people, wind, snow, and ice and the "static" load of the bridge's own weight.
The ground snow load varies. Use the free snow load calculators at Jabacus (related link) to find the snow load for a specific location.
Snow load depends on geographic location, not on roof pitch. Most of Washington falls into the 25 psf snow load. Snoqualmie, for example, has a 50 psf snow load since it receives a higher amount of snow fall than an area such as Seattle. Your county building department can answer this question for your specific location and/or has a snow load map where you can look it up yourself.
the weight of the newer snow compresses the older snow.
weight of load
It's a weight equal to a load, used to balance that load.
dead load and live load dead load is the load of weight that is on the floor that is part of the construction of the house live load is the weight you add to it as in people furniture etc,
From the USDA Forestry Division, they say the snow load for Missouri is 10-20psf. I would reccomend going with the higher of those
the load only
rain load is the weight of rain water
A 4-12 pitch with a 30lb snow load will hold approximately 6 feet of wet snow. 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. We don't get that much dry powder in New England...:)