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Additional conditions and options include:
• Crushing at the heel - Sometimes the forces
transferred through the wood into the bearing
wall are enough to cause the wood to crush over
time, unless either a bearing block is used, or, on
a raised heel condition, the end vertical is run
through to the bearing wall (so the wood
grain is running up and down, which has a higher
shear value), or unless the bearing itself is made
wider so the forces are transferred through more
surface contact area between the truss heel and
the bearing.
• Trusses sitting on concrete walls - When the truss sits on a concrete wall, a seat plate may be required as
a moisture barrier:
Images courtesy of Simpson Strong-Tie®
