Residential Roof And Floor Live Load

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.

Residential roof and floor live load. 1 for garages. Cold weather loads snow typically applied to exposed roofs or decks ground snow load commonly 10 psf usually roof live load governs unless snow drifts are considered frost heave condition where soil under footing freezes and exerts upward movement on the foundation bottom of footings must be below frost depth to avoid this. Unlike stiffness live loads and dead loads are added together to determine minimum design values for strength. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of.

Floors in garages or portions of buildings used for the storage of motor vehicles shall be designed for the uniformly distributed live loads of table 1607 1 or the following concentrated loads. Minimum uniformly distributed live loads adapted from sei asce 7 10. To determine the dead load value for a given floor or roof system the weight of all permanently installed materials in a given component are added together. The roof must be able to support the sum of its dead load and any anticipated live load so the roof has to be designed with a load limit that takes into account both of these loads.

Local building codes specify the minimum live load that floors must be able to bear. Figure 2 live loads and deflection limits are set by. The roof is designed for the roof live load not more than 20 psf or the snow load whichever is greater. This sets an allowable first floor live load of 40 psf a dead load of 10 psf and a deflection of l 360.

Joists and rafters must be strong enough not to break when loaded. To determine the dead load value for a given floor or roof system the weight of all permanently installed materials in a given component are added together. Minimum design loads for buildings and other structures location uniform load psf kn m2 apartments see residential access floor systems office use. 1 inch 25 4 mm 1 square inch 645 16 mm 2 1 pound per square foot 0 0479 kn m 2 1 pound 0 004448 kn 1 pound per cubic foot 16 kg m 3.

To correctly apply the values of the tables and the prescriptive methods of construction build ers must know the structural design criteria in the planning chapter of the code. Loads should be determined in accordance with this chapter. The international residential code on which most local building codes are based requires that floors in non sleeping rooms must support a minimum live load of 40 pounds per square foot and floors in sleeping rooms must be able to handle a live load of 30 pounds per square foot. 0 9d 1 0e effect or 0 9 when resisting the load when permanent.

Since it is possible to use the attic for storage the live load of the attic floor is set at 20 psf according to code. As a result the live load dead load and distribution of forces are different.