Roof Live Load Rain

Special loads such as flood loads ice loads and rain loads are not addressed herein.

Roof live load rain.

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. 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. The reader is referred to the asce. Further in most areas of the.

Live loads roof live loads snow loads rain loads wind loads and earthquake loads are all examples of variable loads. For this reason it is essential to incorporate appropriate provisions for rain loads into building and structure design. When the phrase undeflected roof is used deflections from loads including dead loads shall not be considered when determining the amount of rain on the roof. Those loads produced by the use and occ upancy of the buil ding or other structure and do not include construction or environmental loads such as wind load snow load rain load earthquake load flood load or dead load.

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. The live load on a roof is the weight of any temporary objects on the roof. Until recently floor live load roof live load roof snow load wind load earthquake design data and flood loads were required to be listed on the construction documents.

Note that although rain loads are covered in ibc section 1611 they were not required to be listed on the construction documents. 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. 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. 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.