Where shower floors and receptors are made water tight by the application of materials required by Section P2709.2, the completed liner installation shall be tested. Shower liner shall be tested to the lesser of the depth of threshold or 2" and shall be operated at normal pressure for a test period of not less than 15 minutes, and there shall be no evidence of leakage. The shower liner test shall be performed at the final plumbing inspection.
S.C. Code Regs. § 8-1239