Want this question answered?
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.
Yes, the roof is a load bearing structure. Wind, rain and snow all apply loads to a roof. Snow loads can be very great in some portions of the country
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.
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.
You need to know how much a cubic foot of snow weighs. It depends on the sort of snow. There is 1500 cu ft of snow on the roof.
In 1983 the roof collapsed from heavy snow load.
Snow may give your roof a serious damage if it takes you days to shovel it. When the snow melts, it becomes heavy and when you shovel it, it's like you're trying to get rid of bricks on your roof. And this weight can cause your roof some leaks and some sections to collapse.
No, roof heat cables are to melt snow so your roof doesn't hold all the weight of the snow for a long period of time. Turning the heat cables on without snow will just be wasting electricity.
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.
Anywhere there is a lot of snow fall. A flat roof will cave in under the weight of significant snowfall.
In removing snow on your roof, there are two options. First is by hiring a roof snow removal personnel. Second is by doing the task by yourself. All you need is a roof snow rakes which is available on the market.