Step 3 · Dry-Fit and Mark the Pan

This is the step people usually slow down on. Go finger-tight first, then a quarter turn. No rush — replay the clip whenever it helps.

Carefully place the shower pan into the alcove. Push it tight against the studs. Place a 4-foot level across the top edges (thresholds) of the pan. Check for level side-to-side and front-to-back. The pan's floor is pre-sloped, but the thresholds must be perfectly level. If the subfloor is uneven, you may need to use shims under the pan's feet to temporarily achieve level during this dry fit. This helps you understand how much mortar will be needed. Use a pencil to trace the location of the drain opening onto the subfloor and mark the height of the pan's top flange on each stud.