Roof Joist Definition

Any of the small timbers or metal beams ranged parallel from wall to wall in a structure to support a floor or ceiling.

Roof joist definition.

To fit or furnish. The total joist span is the distance from one end of the joist to the other. 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. Trusses are of many types.

The simplest is a planar truss which is used as a roof support system. 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. 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. 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. Joists are often doubled or tripled placed side by side where conditions warrant such as where wall partitions require support. The design span is the length of the joist measured from the face of the supports at either end. The joist also called bandsill supports the load which the floor is built to bear.

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

It is like the skeleton a building. 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. When sizing a joist or determining its span builders must examine the design span rather than the total span.