Roof Joist Definition

A long thick piece of wood metal or concrete used in buildings to support a floor or ceiling.

Roof joist definition.

Called according to its position or use binding joist bridging joist ceiling joist trimming joist etc. Any of the small timbers or metal beams ranged parallel from wall to wall in a structure to support a floor or ceiling. 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. Trusses are of many types.

Joists are often doubled or tripled placed side by side where conditions warrant such as where wall partitions require support. 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. The design span is the length of the joist measured from the face of the supports at either end. Joists are traditionally made from timber.

The joist also called bandsill supports the load which the floor is built to bear. 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. 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. Of double framed floor under double a.

The total joist span is the distance from one end of the joist to the other. A roof joist is a structural member which provides support for the roof and distributes its weight so that it is even. When incorporated into a floor framing system joists serve to provide stiffness to the subfloor sheathing allowing it to function as a horizontal diaphragm. It is like the skeleton a building.

Joists are either made of wood engineered wood or ste. To fit or furnish. When sizing a joist or determining its span builders must examine the design span rather than the total span.