How Much Roof Load Should I Figure For A Fire

In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing.

How much roof load should i figure for a fire.

Load limits on the roof of a building. To do this i use conservative too heavy dead loads and full snow loads regardless of pitch. To find the amount of plywood needed to cover a roof start by finding the area of the roof. Once the area is known divide by the area of a 4 8 sheet to find how much sheathing is needed.

For dead loads you are correct. However in my practice i typically use the horizontal run of the roof for both types of load. Outside of the u s a degree angle is typically used. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.

I ignore the slope. Here each square foot of roof system delivers 50 pounds of live load and 15 pounds of dead load 65 psf total to the structural support system. Multiply the length of the roof in feet by the width of the roof in feet to find the area of the roof in square feet. Technically you should use the actual rafter length when adding up the weight of roofing materials.

Find the area of a roof. Remember these loads are distributed uniformly over the entire surface of the roof.