A stair stringer must have ______ inches remaining after it has been notched?

A stair stringer should have 3 1/2 inches remaining after it has been notched to ensure adequate structural integrity and safety. This measurement is crucial because the stringer is one of the vital components that supports the treads and risers of the stairs. If the notch was cut too deep, it could compromise the strength of the stringer, leading to potential failure of the stair system.

Maintaining a minimum of 3 1/2 inches provides a sufficient thickness that helps support the weight and stresses placed on the stringer during use, while also allowing for necessary cuts required for stair design. This ensures a balance between the need for functional stair design and the safety standards required in construction practices. Adhering to this standard minimizes the risk of breakage or excessive deformation under load, which is critical for the overall safety of the staircase.