Roof Celine Joists

These span tables list allowable ceiling joist spans for common lumber sizes based on what design load scenario is applied.

Roof celine joists.

Ceiling joist spans for southern yellow pine douglas fir and eastern spruce joist span tables use these tables to determine lengths sizes and spacing of ceiling joists. Before we look at these tables we need to make sure the correct design loads are determined prior to selecting the correct table. 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. They are used to support a ceiling above or the floor below.

The roof joist is what makes up the ceiling of a home. Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor. These joists are below the beam and are tied to it by 2x4. A broken roof joist is a serious problem that must be taken care of immediately.

In this design the tops of the rafters attach to a load bearing ridge beam that runs along the length of the roof. The joists are horizontal pieces of lumber that span the distance from one side of the home to the other. A structural ridge is the standard alternative to ceiling joists. 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 traditionally made from timber.