When the basic width of a tread is increased, what generally happens to the nosing width?

When the basic width of a tread is increased, the nosing width generally increases as well. This is due to the design principles of stair construction that ensure both safety and usability. The nosing is the part of the tread that protrudes beyond the riser, and its increased width provides additional surface area for users to step on, improving grip and reducing the risk of slipping.

By expanding the tread width, it becomes necessary to adjust the nosing accordingly to maintain appropriate proportions and functionality. A wider nosing can also enhance the visual aspect of the stair, contributing to the overall aesthetics of the staircase design. Therefore, as the tread width increases, the nosing width will typically follow suit to maintain the intended usability and safety standards in stair construction.