Load Bearing Flat Roof

How to calculate load bearing capacity of a flat roof step 1.

Load bearing flat roof.

A roof is composed mainly of two parts the cladding or external material and the internal support structure which holds it up. Although they don t bear the full weight load of the roof the gable end walls are also typically load bearing and an interior wall running parallel to the roof ridge in the center of the building often bears. Load bearing walls support the weight of a floor or roof structure above and are so named because they bear a load. Load bearing walls cross roof beams in a perpendicular direction.

This includes the combined weights of all of the individual roof materials. Location 2uniform load psf kn m roofs ordinary flat pitched and curved roofs roofs used for roof gardens roofs used for assembly occupancies roofs used for other occupancies awnings and canopies fabric construction supported by a skeleton structure screen enclosure support frame. By contrast a non load bearing wall sometimes called a partition wall is responsible only for holding up itself. The roof trusses are too long to span the whole house so the load bearing wall runs down the center of the house to support the trusses at the perpendicular intersection in the middle.

The amount of weight the internal support structure can carry without the roof collapsing can be described as its load bearing capacity. Load bearing walls typically run in the same direction. Due to the triangular shape of all but. Multiply the loading per square foot by the area in square feet of the surface which the beams will be supporting.

Determine the dead load of the roof. For rooms which are heavily frequented it may be 50 lbs. On the other two sides the roof terminates in a flat triangular gable. A gable roof is a roof that slopes downward from a central ridge to a building s exterior walls on two sides.

Per square foot for northern areas of the u s. Roof structure and load bearing capacity. Using this technique you ll get a better idea of the location of the load bearing walls in your house. This is determined by adding the weights of any individuals who may work on.

For a flat roof with snow loading this is 25 lbs. For roofs that are flat and with ground snow loads lower than 20 pounds per square foot the roof snow load is equal to 70 of the product of the exposure thermal and importance factors and the ground snow load. For ground snow loads greater than 20 pounds per square foot the roof load is equal to 70 of the product of the exposure thermal and importance factors the ground snow load and 20 pounds. The load bearing capacity of a roof should be adequate to support not only the roof cladding materials such as tiles or shingles but also objects that sit on top of the roof like.

In this roof design the exterior walls on which the roof s sloping rafters rest are load bearing walls. 2 look inside the attic if possible to identify the direction in which the rafters or joists travel.