Water Test Procedure For A Hot Mop Shower Pan?

The process of hot mopping a shower pan involves applying asphalt and felt paper to the shower curb, installing a test plug into the drain, filling the pan with water, and leaving it standing for at least 24-hours to check for leaks. A 24-hour water test is often performed by professionals to ensure the pan is completely watertight before proceeding.

To prepare a shower pan for hot mopping, a waterproof membrane is installed over the subfloor and a pre-sloped mortar bed is installed over the membrane. A durable waterproofing system is crucial for the shower pan, which bears the bulk of water and weight. Two common approaches to pans are preformed and pre-formed.

A shower pan flood test is performed by plugging the drain of the shower and filling it with water. If the water holds that level for 24-72 hours or longer, then the pan is ready for hot mopping.

Some hot mop drains come with a pre-installed plug for water testing. Shining a flashlight into the drain can help clear the holes and ensure the pan is watertight. Understanding the pros, cons, and installation process allows you to make an informed decision for your shower.