a. Placement. After the rafters have been assembled into trusses, they must be placed on the
building (see Figure 3-18). Assemble the first set of rafters in the end section of the building or at the
center. Raise rafter trusses into position by hand and nail them into place with 16d nails. (Temporary
workbenches may be built for the workers to stand on while erecting trusses.) These trusses must be
temporarily braced at the end section of the building until the sheathing is applied. Knee braces are not
used on every rafter truss unless needed. Install trusses as follows:
Figure 3-18. Installing trusses
(1) Mark the proper positions of all truss assemblies on the top plate. The marks must show
the exact position on the face of all rafters (such as south or north) (see Figure 3-18, A).
(2) Rest one end of a truss assembly, peak down, on an appropriate mark on the top plate on
one end of the structure (see Figure 3-18, A).
(3) Rest the other end of the truss on the corresponding mark of the top plate on the other
side of the structure (see Figure 3-18, B).
3-13
EN5156
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