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To explain...
"Thermal bridging" is just the different points where heat transfer has an easier path across part of a building's outside envelope. For example, think of a standard stick frame wall (I know you don't want wood) with R14 insulation in between the studs. The R value is 14 for the 14½" wide batts but then the next 1½" of stud has only the R value of 4.4. So the wall as a system isn't R14 because of the studs allow heat to transfer easier than the rest of the wall - heat energy will always take the easiest path to get to something cooler. You can see thermal bridging clearly when taking an IR photo of a place.
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