Definition:- A wall which is constructed to carries weight of the building (slab or other elements of building) and distributes that load onto building’s foundation is called Load Bearing wall.
These walls carry weight of roof system, Roof trusses rest on these walls and create a continuous plane all the way down to the building’s foundation. Load bearing walls which are easiest to identify are home’s exterior walls.
In most residential walls, a 2nd set of load bearing walls, one on each floor, exists along center-line of home. In the basement this wall is created by a metal beam. Directly above metal beam on 1st and 2nd floors, a wall down the middle of home also helps support roof truss weight.