Roof Joist Definition

A joist is a horizontal structural member used in framing to span an open space often between beams that subsequently transfer loads to vertical members.

Roof joist definition.

Some roof designs lack joists depending on how they are designed using careful manipulation of other structural members to achieve the desired level of strength and stability. Joists are either made of wood engineered wood or ste. Called according to its position or use binding joist bridging joist ceiling joist trimming joist etc. The total joist span is the distance from one end of the joist to the other.

The joist also called bandsill supports the load which the floor is built to bear. Joist noun a piece of timber laid horizontally or nearly so to which the planks of the floor or the laths or furring strips of a ceiling are nailed. A long thick piece of wood metal or concrete used in buildings to support a floor or ceiling. A roof joist is a structural member which provides support for the roof and distributes its weight so that it is even.

Joists may make up the structural framing of a roof. Joists are traditionally made from timber. Trusses are of many types. When incorporated into a floor framing system joists serve to provide stiffness to the subfloor sheathing allowing it to function as a horizontal diaphragm.

They are nominally 2 inches thick actual width usually 1 1 2 inches and come in a variety of widths from 8 to 12 inches. Joists are often doubled or tripled placed side by side where conditions warrant such as where wall partitions require support. It is like the skeleton a building. The simplest is a planar truss which is used as a roof support system.

When sizing a joist or determining its span builders must examine the design span rather than the total span. Joists are the parallel horizontal beams that run across an open space joining opposite walls in a building to support both the ceiling below and the floor above. Any of the small timbers or metal beams ranged parallel from wall to wall in a structure to support a floor or ceiling.