Timber Roof Joists

Notches are not to exceed 0 125 of the depth of the joist and are to be located between 0 07 and 0 25 of the span from the support.

Timber roof joists.

Timber 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. 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. Here we have a wood framed gable roof. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.

Let s consider a basic gable wood roof framing design. This is the distance between joist centres. Floor beam span tables of residential structural design we will now look at roof rafter and beam design. Continuing on from part 3.

Fastenmaster is an american based manufacturer of structural wood screws composite deck screws hidden deck and trim fasteners hidden deck clips autofeed screw systems and hot melt construction adhesives. Joists are traditionally made from timber. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.