Glass floors and stair treads are found in both residential and commercial settings, and are growing in popularity because of their aesthetic appeal as well as for the daylighting benefits they bring to a space. While there are manufacturers that provide engineered and tested flooring systems, most glass floor and stair tread projects require the input of a structural engineer to provide load calculations and an experienced installer to provide glazing details. Because pedestrian safety is a critical objective, the glazing in-fill must provide an acceptable level of slip resistance. If there is a possibility for inappropriate lines of sight, the glass will require greater opacity or translucency to address a concern for modesty. This document discusses several considerations for using glass in flooring and stair applications. This document was published in April 2013. The original version of this document was approved and published in 2007. This edition of the paper was updated and published in 2020.