Leak from second floor shower into first floor ceiling.
Shower drain leaking down onto first floor ceiling.
Of course if the leak is severe enough that you need to put a bucket on the floor to collect the water then immediately contact your local plumber.
If you have a second story bathroom the problem could be in.
I like to cover the drain and at least 6 inches on all sides.
Here at atlantis plumbing we have taken care of many ceiling leaks successfully and we re available 24 7.
But it also happens a lot with showers as well.
The most common causes are the shower pan and or a drain pipe.
Use this water to fill the shower until the water reaches the level of the threshold.
Clean the shower floor and let dry completely.
Now using a different water source such as a garden hose or another bathroom fill buckets with water.
Packy ma if you plugged the drain and had 3 inches of standing water in the base the leak is not around the tile nor the drain nor pan.
Use a good quality duct tape to cover the drain.
The water can run outside of the shower door area onto the floor of the bathroom and leak between the shower and the floor area.
Door frames often leak as well.
A leaking shower is generally due to plumbers putty that has started to give away around the seals on the shower drain allowing water to seep through the cracks and onto the basement ceiling below.
To determine if its something else such as a leak in the drain or wall you can do a few things.
How to fix a leak from the upstairs bathroom.
This is a very common issue with tubs.
I believe in previous post you indicated the plumber removed the shower heads capped the shower arms and turned water on.