Roof Live Load Rain

The live load on a roof is the weight of any temporary objects on the roof.

Roof live load rain.

Further in most areas of the. 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. The reader is referred to the asce. In other words on a steep roof less material would be stacked in a concentrated area at one time to avoid having it slide off.

Section 1611 of the 2015 edition of the international building code is focused on rain loads and it stipulates that each portion of a roof be designed to sustain the load of rainwater that will accumulate on it under. These loads are not considered to be per manent because of their inherent degree of variability with respect to time see the definition of loads in ibc 202. Very slightly over time. Live loads roof live loads snow loads rain loads wind loads and earthquake loads are all examples of variable loads.

Where snow isn t a problem the live load can come from people working on the roof and any equipment they take on to the. Those loads produc ed 1 during maintenance by workers equipment and. For this reason it is essential to incorporate appropriate provisions for rain loads into building and structure design. In my region on cape cod we have a ground snow load design of 25 psf which is a greater design load than the live load 12 psf to 20 psf over an entire roof system.

Note that although rain loads are covered in ibc section 1611 they were not required to be listed on the construction documents. Axial forces from snow loads and roof live loads should usually not be considered simultaneously with an extreme wind load because they are mutually exclusive on residential sloped roofs. Rain load on the undeflected roof in psf kn m 2. Special loads such as flood loads ice loads and rain loads are not addressed herein.