Griund Versus Roof Load

In our case let s assume that our structure has a flat roof roof slope 5.

Griund versus roof load.

Table 1 1 page 3. The determination of the drift load that is. The flat roof snow load is calculated using formula 7 3 1. Weight of permanent.

Enter the information requested like the rise and the roof ground snow load for your city exposure roof type etc. Snow loads can be presented in two different ways. 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. 49 42 35 28 24 5 21 17 5 assumed value thermal factor ct.

Then follow the instructions. The snow load that is applied to our structure is not the ground snow load but in most cases the flat roof snow load. The calculator will tell you the pounds per square foot of snow. Ground and roof snow loads for idaho by r.

Sheikh taheri snow loading is the most severe test of roof structures in many parts of the state of idaho. The truss could be designed based on the assumption that the 25 psf roof snow load is a factored ground snow load in which case a ground snow load is back calculated using asce 7 based on the specified roof snow load pg 25 psf therein lies the problem with specifying only a roof snow load. Ground snow load pg. 1 0 exposure factor ce.

The roof shall be designed for the live load indicated in table r301 6 or the snow load indicated. Ground snow load or roof snow load snow load. It s quite easy to find one online. 1 0 importance factor i.

This issue of live load vs. 70 60 50 40 35 30 25 x0 7 x0 7 x0 7 x0 7 x0 7 x0 7 x0 7 roof snow load. Economical structural design in these areas requires an accurate prediction of the ground snow plus an understanding of how the snow is distributed on the roofs. Figure 7 1 pages 84 85 and table 7 1 page 92.

Length of roof upwind of the snow drift. Roof load live load design is affected by the shape of the roof whether it is flat curved or pitched. Other considerations for sloped roofs can be found throughout chapter 7 of asce 7 10. After that you ll need to use a snow load calculator.

Victor staley a building official in the town of brewster mass responds. Length of high roof lu. Roof loads are a downward vertical force on the home. The north zone middle zone and the south zone are identified on the roof load zone map above.

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.