Hello wcdapro! Thank you for your question! This L61-00 Fasade decorative ceiling panel is meant to be dropped into a grid system. The "L" part of the model number represents "Lay-In" panel. We do not recommend gluing or nailing these panels directly to the ceiling due to the seam that would be prominent every 24 inches. We do offer Fasade decorative Glue-up ceiling panels that have a 1/2" overlapping lip around the perimeter of the panel for ease of installation. The Glue-Up panels have a model number that begins with "G" for Glue-Up/Direct-apply. These are available in 2'x2' and 2'x4' dimensions. You can special order this item by ordering online or contacting/visiting your local Home Depot stores help desk with this request.
Prior to installation, it is recommended that the entire ceiling be smooth and flat. Apply a drywall primer or paint primer. Once you have your ceiling panels installed, the panels can be cleaned with soap and water only. Any harsh abrasives will damage the finish on the tiles. For this reason, we normally do not recommend installing our panels inside a shower or bathtub. For additional protection in high traffic areas (outside of tub, above shower, inside bathroom) we recommend applying a silicone sealant for moisture resistance. This will ensure quality protection for years to come.
The recommended adhesive is Loctite® PL Premium for a permanent application. Once the adhesive fully cures, it will solidify so the moisture will not affect your wall. Please feel free to contact customer care for installation troubleshooting (800.434.3750).