The computer design of light frame trusses results in the generation of fabrication instructions
that indicate the precise cutting patterns for each of the members and the type, size, and
location of connector plates required. A layout template is made for each configuration to ensure
that like trusses are identical in dimension. The member pieces are cut to correct dimension and
assembled in the template, which is located on a floor, truss jig, or heavy table.
The cutting drawings show a sketch of the truss and contain the following important information:
overall truss dimensions
location of all supports
web and chord sizes and grades
plate size, type, and location for each joint
The chords and webs are connected together by the use of truss plates, which transfer the
tensile, compressive and shear forces. Identical truss plates are placed directly opposite each
other on opposing faces and are pressed into the wood members using hydraulic platen
( plates ) presses or rollers.
Figure 4: Manufacturing of Light Frame Trusses
Click picture to enlarge view.
When the pressing of the plates has been completed, the trusses are checked for dimensions,
wood to wood gaps, lumber size and species, plate size, positioning and embedment and moved
to a storage area. In some cases plants have a quality control program that ensures consistency
in production and quality in place of checking each truss. The completed trusses are then
strapped together and placed in the storage yard in preparation for shipping.