Roof Ceiling Joists

Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists.

Roof ceiling joists.

Joists are traditionally made from timber. Ceiling joist loads ceiling joists are sized based on one of two tables found in the code. 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. Ceiling joist spans for southern yellow pine douglas fir and eastern spruce.

Ceiling joists are normally horizontal members however under special circumstances they can be fixed on a slope. If this is the case with your structure use the floor joist table to determine maximum joist length load. The joists are horizontal pieces of lumber that span the distance from one side of the home to the other. They are spaced according to the material they support.

The first surface is unsurprisingly the ceiling the materials of which attach directly to the joists. For coupled roofs ceiling joists have to be in single lengths or spliced. Standard size of joists. Typically the material is plasterboard which can span 450 mm.

These span tables list allowable ceiling joist spans for common lumber sizes based on what design load scenario is applied. Ceiling joists provide support for more than one surface in your home. A broken roof joist is a serious problem that must be taken care of immediately. 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. The roof joist is what makes up the ceiling of a home.