A reader speaks out on what he feels is a misrepresentation of the properties of gypsum.

Ray Thompson’s article, “Troubleshooting Resilient Concerns,” addressed many important issues regarding resilient floor installation. However, it missed the mark in claiming that gypsum “has a tendency to soften and expand when subjected to excessive moisture.”

Unfortunately, this statement tends to reinforce certain myths about gypsum that are disproved by scientific testing. As we make both cement- and gypsum-based compounds, we feel well-qualified to recommend either, depending on the application. Certainly, in the presence of occasional standing water, cement is a more water-resistant material, and the surface of lesser-quality gypsum patches may soften.