Step 5 · Mix and Apply Mortar

This is the step most people slow down on. Take it one move at a time — there’s no rush, and you can rewind the clip as many times as you need.

In a 5-gallon bucket, mix the mortar with water using a mixing paddle attached to a drill. Follow the manufacturer's ratio. Aim for a thick, stiff consistency, similar to packed sand or peanut butter. It should hold its shape and not be runny. Using a trowel, spread a layer of mortar 1 to 2 inches thick across the subfloor area where the pan will sit. Distribute it evenly in mounds, but leave a small open area immediately around the drain pipe to avoid getting mortar in the connection. Ensure the entire bottom of the pan will be supported.