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. The first surface is unsurprisingly the ceiling the materials of which attach directly to the joists. These span tables list allowable ceiling joist spans for common lumber sizes based on what design load scenario is applied. Joists are traditionally made from timber.

They are used to support a ceiling above or the floor below. Ceiling joists are normally horizontal members however under special circumstances they can be fixed on a slope. Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists. 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.

Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor. Ceiling joists provide support for more than one surface in your home. Standard size of 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.

The joists are horizontal pieces of lumber that span the distance from one side of the home to the other. The other surfaces are the walls which the joists span the distance between providing a source of support to keep the walls from shifting. If this is the case with your structure use the floor joist table to determine maximum joist length load. 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. They are spaced according to the material they support.