Timber Roof Joists

Usually 400 450 or 600mm but any value can be used up to 610mm max usually 400 450 or 600mm but any value can be used up to 610mm max 1 2 timber strength class and joist size.

Timber roof joists.

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. 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. 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. Floor beam span tables of residential structural design we will now look at roof rafter and beam design.

Here we have a wood framed gable roof. This is the distance between joist centres. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. Joists are traditionally made from timber.

Harmony timber are manufacturers of timber frame roof truss kits and open metal web joists based in county wicklow ireland. Let s consider a basic gable wood roof framing design. 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.