Roofs framed with trusses are engineered systems that demand careful installation and bracing. Any changes in bearing or loading to the original plan, or any field modifications to trusses, needs an engineer's approval.
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Floor trusses can be designed to sit on either their bottom chord or their top chord (below).
Figure: Truss Types
Caution: Loose Plates
Connector plates should be centered over the joint and firmly embedded in the wood. Never refasten a loose plate: The bond cannot be restored once it’s been broken.