Roof Ceiling Joists

The joists are horizontal pieces of lumber that span the distance from one side of the home to the other.

Roof ceiling joists.

Ceiling joist spans for southern yellow pine douglas fir and eastern spruce. These span tables list allowable ceiling joist spans for common lumber sizes based on what design load scenario is applied. The other surfaces are the walls which the joists span the distance between providing a source of support to keep the walls from shifting. Joists are traditionally made from timber.

The roof joist is what makes up the ceiling of a home. Ceiling joist loads ceiling joists are sized based on one of two tables found in the code. Typically the material is plasterboard which can span 450 mm. They are used to support a ceiling above or the floor below.

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. 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. Before we look at these tables we need to make sure the correct design loads are determined prior to selecting the correct table.

If this is the case with your structure use the floor joist table to determine maximum joist length load. 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. For coupled roofs ceiling joists have to be in single lengths or spliced.

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.