How Much Roof Load Should I Figure For A Fire

Technically you should use the actual rafter length when adding up the weight of roofing materials.

How much roof load should i figure for a fire.

Roofs are under a lot of pressure. Remember these loads are distributed uniformly over the entire surface of the roof. Outside of the u s a degree angle is typically used. To find the amount of plywood needed to cover a roof start by finding the area of the roof.

Find the area of a roof. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. 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. Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used.

Load limits on the roof of a building. Once the area is known divide by the area of a 4 8 sheet to find how much sheathing is needed. 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. For dead loads you are correct.

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. However in my practice i typically use the horizontal run of the roof for both types of load.