Do I have to caulk the seams between Styrofoam ceiling tiles? Ruchi Gupta May 12, 2018 04:47 Yes, if you want to keep moisture from getting behind the tiles and for best aesthetic results. Related articles What type of glue should I use for Styrofoam ceiling tiles? Can I paint The Styrofoam Ceiling Tiles and what paint should I use? How do I finish Styrofoam ceiling tiles where they meet the wall? Installing Styrofoam Ceiling Tiles Do I have to install Crown Molding before or after installing Styrofoam ceiling tiles? Comments 0 comments Please sign in to leave a comment.