Besides this method you can make observations around your shower pan for leaks.
Shower leaking to floor below.
If you use a curtain look for standing water on the floor after you shower.
Depending on which floor this shower is located you might see water or water marks on a ceiling or when you look in the basement or crawl space.
How to find the source of a bathtub drain leaking.
Just a note about shower or bathtub leaks over a garage.
Water stains on the ceiling or joists below.
The best way to tell if this is your problem is to push down on the floor around the drain.
Soggy carpets around the shower stall.
Let s check for the next possibility.
If your tile shower is leaking the cause of the leak must be found and addressed as soon as possible and definitely before you take a shower again.
A damp spot or worse a continuous drip from the ceiling overhead signals trouble.
Water leaks from a plumbing fixture or pipes may go unnoticed for days or even weeks until you notice a wet spot or water stain on the ceiling below.
Once you see that the water is coming through the ceiling take immediate action before the leak causes any more damage to your house.
The area around the shower pan for dampness and water.
Another way to tell is to examine the drain from underneath which can be accomplished in the crawlspace or the basement.
This cuts the cost of having to dig through the floor to get to the water pipes and if for any.
If you see a leak at this point there likely is a problem with the shower base.
Stop up the drain and fill the pan with water and let it sit.
How to fix a leak from the upstairs bathroom.
Mold spots on the wall or floor near the tub or shower.
If you have a shower door splash water all around the door and frame.
If no water drips out below check closely with a bright light it may not be your shower pan leaking.
If it gives this may be the problem.
The idea is to use the process of elimination and keep looking for any evidence of a leak each step of the way.
If it happens that your shower or bathtub is located above your garage you can cut costs by having the plumber cut the ceiling under those pipes and replacing it with a removable door.
If you have a second story bathroom the problem could be in.
Loose floor tiles close to the shower.
The ceiling board or floor may show some stains.
Leaking drainpipes in a shower or a bathroom plug will let water underneath tile.
Below the shower pan if the pan is on an upper floor.
The areas to check include.