Should the entire stringer plum cut bear on the deck rim joist?

The correct answer emphasizes the structural integrity required when supporting a stringer, which is a critical component for the staircase. The entire stringer should indeed rest on the deck rim joist, as this ensures that the load is distributed evenly and securely. Proper design is essential because the rim joist must be capable of bearing the increased load imposed by the stringer, especially when weight is added from individuals using the stairs.

When the entire stringer is supported by the rim joist, it minimizes potential movement or flexing that could occur with partial or inadequate support, enhancing safety and stability. It's important for the rim joist to be constructed from robust materials and appropriately sized to handle the expected loads. Correctly engineering this portion means that the overall structure remains safe for use and compliant with building codes and standards.