How do I seal a poured concrete shower base?

Concrete Basement Shower Pan Note: Building codes have different requirements for shower pans. Make sure to check and follow local codes when fabricating a new pan. Make sure the area for the new shower pan is free of debris before getting started. Amy and Andy used a shower pan liner kit for this installation. The liner in this kit was made of rubberized asphalt laminated to a reinforcement fabric. The 5' by 6' membrane fits showers up to 4' by 5'. Spread out and center the liner across the floor of the shower space and up each wall. The liner should go at least 6" up the wall on all sides. When the liner is centered, make a small hole in the liner with a utility knife to mark the center of the drain. Figure A Figure B Figure C Figure D Remove the liner from the shower area to prep the drain. Remove the drain grill and set aside. Seal the drain base to the concrete with a bead of mastic (Figure A). The kit included a sticky piece of 12" x 12" detail tape. Cover the drain with this ...  more