2021 IRC (International Residential Code) | Chapter 25 Plumbing Administration
P2503.6 Shower liner test.
Where shower floors and receptors are made watertight by the application of materials required by Section P2709.2, the completed liner installation shall be tested. The pipe from the shower drain shall be plugged watertight for the test. The floor and receptor area shall be filled with potable water to a depth of not less than 2 inches (51 mm) measured at the threshold. Where a threshold of not less than 2 inches (51 mm) in height does not exist, a temporary threshold shall be constructed to retain the test water in the lined floor or receptor area to a level not less than 2 inches (51 mm) in depth measured at the threshold. The water shall be retained for a test period of not less than 15 minutes and there shall not be evidence of leakage.
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Filling the shower with water without a temporary curb will allow close to 2" of water at the critical plumbing connection (depending on slope and shower configuration). Water testing is OK by Schluter without the temporary curb - if this is allowed by the respective local building department. Schluter will ultimately respect each municipalities decisions. If a water test without a curb is not approved, please reference this video on how to construct a temporary curb for testing.
