Roof Ceiling Joists

For coupled roofs ceiling joists have to be in single lengths or spliced.

Roof ceiling joists.

A broken roof joist is a serious problem that must be taken care of immediately. Standard size of joists. The roof joist is what makes up the ceiling of a home. They are used to support a ceiling above or the floor below.

The first surface is unsurprisingly the ceiling the materials of which attach directly to the joists. Joists are traditionally made from timber. They are spaced according to the material they support. Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists.

The other surfaces are the walls which the joists span the distance between providing a source of support to keep the walls from shifting. Before we look at these tables we need to make sure the correct design loads are determined prior to selecting the correct table. Ceiling joists provide support for more than one surface in your home. If this is the case with your structure use the floor joist table to determine maximum joist length load.

These span tables list allowable ceiling joist spans for common lumber sizes based on what design load scenario is applied. Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor. 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. The joists are horizontal pieces of lumber that span the distance from one side of the home to the other.

Ceiling joist spans for southern yellow pine douglas fir and eastern spruce. 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.