A roof is composed mainly of two parts the cladding or external material and the internal support structure which holds it up.
Load bearing flat roof.
2 look inside the attic if possible to identify the direction in which the rafters or joists travel.
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.
Calculate the live load of the roof.
A gable roof is a roof that slopes downward from a central ridge to a building s exterior walls on two sides.
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.
Determine the dead load of the roof.
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.
Load bearing walls support the weight of a floor or roof structure above and are so named because they bear a load.
If a wall is located on the ground floor go down to the basement to observe the ceiling beams.
On the other two sides the roof terminates in a flat triangular gable.
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.
Multiply the loading per square foot by the area in square feet of the surface which the beams will be supporting.
Load bearing walls typically run in the same direction.
The amount of weight the internal support structure can carry without the roof collapsing can be described as its load bearing capacity.
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.
Using this technique you ll get a better idea of the location of the load bearing walls in your house.
This includes the combined weights of all of the individual roof materials.
How to calculate load bearing capacity of a flat roof step 1.
Roof structure and load bearing capacity.
In this roof design the exterior walls on which the roof s sloping rafters rest are load bearing walls.
For a flat roof with snow loading this is 25 lbs.
Per square foot for northern areas of the u s.
Step 4 determine the flat roof snow load.
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.
Load bearing walls cross roof beams in a perpendicular direction.
