Quote Originally Posted by mas985
One thing I never quite did understand is the logic behind bonding the rebar in a concrete deck since all of the rebar is surrounded by a fairly good insulator (concrete). I guess it is in case the rebar comes in contact with other metal that is exposed but I cannot think of any other reason.
Wet concrete is a pretty good conductor. Connecting the rebar to the bonding grid or putting a bonded metal mesh in the concrete does a fairly good job of connecting the concrete to the bonding system when the concrete is wet.