Roof Ceiling Joists

They are spaced according to the material they support.

Roof ceiling joists.

They are used to support a ceiling above or the floor below. For coupled roofs ceiling joists have to be in single lengths or spliced. Joists are traditionally made from timber. Ceiling joists of the first floor of a two story structure often serve as floor joists for the second floor.

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. Before we look at these tables we need to make sure the correct design loads are determined prior to selecting the correct table. A broken roof joist is a serious problem that must be taken care of immediately. 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. The roof joist is what makes up the ceiling of a home. Ceiling joist spans for southern yellow pine douglas fir and eastern spruce. Typically the material is plasterboard which can span 450 mm.

Ceiling joists provide support for more than one surface in your home. Ceiling joist loads ceiling joists are sized based on one of two tables found in the code. Joist span tables use these tables to determine lengths sizes and spacing of ceiling joists. The first surface is unsurprisingly the ceiling the materials of which attach directly to the joists.

If this is the case with your structure use the floor joist table to determine maximum joist length load. Standard size of joists.