If the snow weighs 10 pounds per cubic foot and there are 1 5 feet on the roof each square foot of the roof is getting 15 pounds of pressure.
Ground snow load vs roof snow load.
If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow.
Length of high roof lu.
49 42 35 28 24 5 21 17 5 assumed value thermal factor ct.
A predictable load situation that is derived from snowfall records over the years in a particular region photo 2.
In our case let s assume that our structure has a flat roof roof slope 5.
70 60 50 40 35 30 25 x0 7 x0 7 x0 7 x0 7 x0 7 x0 7 x0 7 roof snow load.
The basis for the snow load computation in asce 7 05 is the ground snow load.
The value used for the ground snow load should represent the snow load that has a 50 year mean recurrence interval or in other words a 2 probability of being exceeded in any given year.
The ground snow load is pretty much what it sounds like.
Ground snow load pg.
Length of roof upwind of the snow drift.
Each state has a listing of building code and applicable guidelines for snow loads as well as details about where the snow load information may be found or purchased.
When discussing snow load with anyone it is crucial to have a clear understanding as to if the load is a ground or flat roof snow load.
Snow loads can be presented in two different ways.
The purpose of this web site is to provide ground snow load analysis information and data gathered from all 50 states.
Roof snow load and the applicable snow.
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.
The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load.
Pf is flat roof snow load if as a consumer your concern is snowfall and you want to upgrade the ability of your building to carry it this is the value to increase.
Even when the specification is clear regarding ground snow vs.
If you live in the us our snow load calculator compares the total weight on your roof with the permissible load calculated according to the standards issued by the american society of civil engineers regarding the minimum design loads for buildings and other structures asce7 16.
Purpose of this web site.
From eave to ridge w.
1 0 exposure factor ce.
Length of low roof ll.
Length of roof downwind of the snow drift.
Weight of permanent.
Horizontal distance from eave to ridge.
1 0 importance factor i.
The flat roof snow load is calculated using formula 7 3 1.
Figure 7 1 pages 84 85 and table 7 1 page 92.
Ground snow load or roof snow load snow load.
