How load actually travels through a pallet
Weight enters through the top deck boards, transfers into the stringers or blocks, and leaves through the bottom deck or directly into the floor. Failure almost always begins at a nail line, not in the middle of a board, because that is where fibre has been displaced.
This is why a repaired pallet with new companion stringers can be stronger than the original: the new timber is fresh, dry and nailed with helical fasteners that resist withdrawal.
