Roof Celine Joists

A structural ridge is the standard alternative to ceiling joists.

Roof celine joists.

Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor. Before we look at these tables we need to make sure the correct design loads are determined prior to selecting the correct table. 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. The ceiling joist 2x4s are running at right angles to the beam and rafters across the 12ft span of the room.

A broken roof joist is a serious problem that must be taken care of immediately. These span tables list allowable ceiling joist spans for common lumber sizes based on what design load scenario is applied. In this design the tops of the rafters attach to a load bearing ridge beam that runs along the length of the roof. Joists are traditionally made from timber.

The joists are horizontal pieces of lumber that span the distance from one side of the home to the other. The roof joist is what makes up the ceiling of a home. These joists are below the beam and are tied to it by 2x4. 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.