Miscellaneous Architectural Roof Loads

The standard guide in the u s the asce 7 05 lists weights and stresses for all building materials expressed in pounds per square foot.

Miscellaneous architectural roof loads.

2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes. For standing seam and through fastened metal panel. Also the roof sheathing working in conjunction with the roof framing must function as a diaphragm to transfer lateral loads to the building s shear walls. Roof load live load design is affected by the shape of the roof whether it is flat curved or pitched.

Roof live loads largest roof loads typically caused by repair and maintenance pitch rise span lr 20 r1r2 12 lr 20 lr horizontal projection roof live load 16 r 1 r 2 live load reduction factors r 1 accounts for size of tributary area of roof column a t r 2 effect of the roof rise. Specify purchase a metal roof system that has sufficient uplift resist resistance to meet the design uplift loads. Load limits on the roof of a building. Created by wind pressures.

Roof loads are a downward vertical force on the home. This roof system also has wind bracing at the end trusses blocking at the supports and minor wiring. Arch 331 note set 13 1 s2014abn 2. Loads on buildings and structures 2 1 introduction 2 1 1 scope this chapter specifies the minimum design forces including dead load live load wind and earthquake loads miscellaneous loads and their various combinations.

Table 3 2 2 summarizes the calculation. Roofs are under a lot of pressure. Calculate loads on the roof assembly in accordance with asce 7 or the local building code whichever procedure results in the highest loads. 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 t effect of material temperature h hydraulic loads from soil f hydraulic loads from fluids.

We will use a value between 1 5 and 2 5 to account for this extra stuff. In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing. This downward imposed load on the home is also known as the snow load. The roof sheathing supports gravity loads such as the roof live load snow load and vertical uplift loads.

Table 3 2 2 roof system dead load. Calculating the load on a flat roof is a challenging task for the layperson that involves knowledge of building materials their weights and local building codes.