Roof Snow Load Form Ground Snow Load

The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load.

Roof snow load form ground snow load.

70 60 50 40 35 30 25 x0 7 x0 7 x0 7 x0 7 x0 7 x0 7 x0 7 roof snow load. Note that this is not enough data to support using this as a general equation for ground snow load. Roof snow load is a much more important statistic and is computed from the ground load in a region. Weight of permanent.

A predictable load situation that is derived from snowfall records over the years in a particular region photo 2. 49 42 35 28 24 5 21 17 5 assumed value thermal factor ct. Asce 7 drift height calculation. Paolo formichi university of pisa italy.

Roof snow load and the applicable snow. Even when the specification is clear regarding ground snow vs. 1 0 exposure factor ce. In colder regions the design snow load represents snow deposited by multiple snow events.

If the ground snow load isn t specified then a ground snow load needs to be assumed and the truss designer and the building designer may not be on the same page as it relates to this design assumption. Snow loads can be presented in two different ways. Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10. These figures are established by the local jurisdiction in my case the state of massachusetts which lists ground snow loads for each town in the state.

Snow load thickness density. You can also find the load per square meter or square foot of roofing by opening the advanced mode. Once you have the ground snow load p g you can compute the flat roof snow load p f. Ground snow load 1 50 abs snow depth in 12 40.

Background and applications section 4 snow load on the ground the snow load on the roof is derived from the snow load on the ground multiplying by appropriate conversion factors shape thermal and exposure coefficients. Ground snow load refers to the weight of water per square foot that is exerted on the ground by the snow pack. The flat roof snow load is calculated using formula 7 3 1. If you want to calculate these values by hand use the following formulas.

Once you know these values our snow load calculator automatically finds the total weight of snow on your roof. 1 0 importance factor i. Ground snow load or roof snow load snow load. The ground snow load is pretty much what it sounds like.

The design snow load represents the peak snow accumulation on a roof over the a winter season. This may also be true in some more moderate climates as well.