Live Load Of Flat Roof

D dead load l live load l r live roof load w wind load s snow load e earthquake load r rainwater load or ice water load.

Live load of flat roof.

Roof load live load design is affected by the shape of the roof whether it is flat curved or pitched. Roof loads are a downward vertical force on the home. The north zone middle zone and the south zone are identified on the roof load zone map above. If the snow weighs 10 pounds per cubic foot and there are 1 5 feet on the roof each square foot of the roof is getting 15 pounds of pressure.

Roofs of buildings used for promenade or incidental assembly purposes shall be designed for a minimum load of 400 kg m2 4 kn m2 or heavier it required. The live load on a roof is the weight of any temporary objects on the roof. Further in most areas of the united states design winds are produced by either hurricanes or thunderstorms. This downward imposed load on the home is also known as the snow 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. To figure out the load on your roof take the depth of snow in feet and multiply it by the weight of a cubic foot of snow. If your roof is 1 000 square feet the total snow load is 15 000 pounds of snow. But when we discuss roofs these days live loads are generally associated with the weight that the roof structure might be asked to endure while the roof is under construction or renovation reroofing.

Live loads on roofs table 1 3 gives lives loads on flat roofs sloping roofs and curved roofs. Flat roofs often can carry a higher live load than sloped roofs. Used but they typically defined the load cases or combination stress or strength limits and deflection limits. Load types loads used in design load equations are given letters by type.