NWFA Expo 2026

To Fill or Not to Fill: The Science of Wood Floor Gapping (Room W224 EF)

Wood floor gapping is one of the most common issues contractors face. This technical session explores the science behind why wood floors gap, including moisture content changes, seasonal movement, and installation factors.

Speakers Mike Dittmer and Rob Johnson from Bona will guide attendees through a practical decision-making framework: when gaps should be left alone, when filling is appropriate, and how to select the right filling method based on gap size and floor conditions. Learn about different filling materials, application techniques, and best practices for achieving durable, professional results.