For installation of 1/2" Wall & Ceiling panels and trims to concrete in high moisture or acidic areas we recommend using tapcon or nylon drive-pin fasteners. with a low profile head will do a good job for this purpose. Locating fasteners every 24" on center; in the center of the slots provided along the nailing fin of the panel or make a 3/16" hole centered on the width of the nailiing fin 24" apart, for the fasteners as required. You want to provide for a little movement of the panels ( 1/64"-1/32"), do not over tighten screws to the nailing fin. Allow panels to acclimate to area before installation as per installation instructions.