Our balanced snow load is found as 21 psf. Our roof pitch was indicated on the drawings as 2:12, which calculates the roof angle as 9.46 degrees.We can leave our roof surface type as “obstructed or non-slippery surfaces” and we can remove any additional properties for snow drifts. The horizontal distance from eave to ridge is equal to half of the building length, which we can input as ‘(21ft+4in)/2’, and ClearCalcs will calculate that to be 10.7 ft. The values for the rest of the load calculations will be taken from Project Defaults unless the override option is set to “Yes”. You may want to do this if you wanted to calculate a snow load with different conditions than the rest of your design. If you want to override the project default properties in the snow load calculator, you can input these values as shown in the image below. Last, we will assume our thermal condition of the roof is warm. Moving back to the snow loads calculator, our roof exposure can be set to sheltered, since we are designing to be located in the city with other buildings as nearby obstructions. Still in Project Defaults, the building risk category can be set as II - Regular Building. We can enter in our ground snow load here, as 25 psf. This determines the fully exposed, partially exposed and sheltered factors. For our example, we will assume our building is located in the city and use exposure category B, so that we are using the most conservative roughness category. To navigate to the Project Defaults, we can select the tab on the left hand side of the screen.įrom here, the important values for snow loads calculations will be entering the exposure category and ground snow load. The site and building properties can be set in Project Defaults, or can be overridden in the snow loads calculator. You can follow along with the video of this example, and you can check out our other article for further design of these steel joists here.Įntering your Properties Site and Building Properties We are designing the snow loads for the roof of a single storey commercial building. Our given information is that the ground snow load is 25 psf. This example will look at the snow load calculations for a building located in Chicago, IL.
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