If you use a curtain look for standing water on the floor after you shower.
Shower leaking to floor below.
Another way to tell is to examine the drain from underneath which can be accomplished in the crawlspace or the basement.
How to find the source of a bathtub drain leaking.
The ceiling board or floor may show some stains.
Soggy carpets around the shower stall.
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.
Leaking drainpipes in a shower or a bathroom plug will let water underneath tile.
Let s check for the next possibility.
Stop up the drain and fill the pan with water and let it sit.
Water stains on the ceiling or joists below.
The area around the shower pan for dampness and water.
This cuts the cost of having to dig through the floor to get to the water pipes and if for any.
Mold spots on the wall or floor near the tub or shower.
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.
Failure to do so puts more moisture behind the wall or under the floor which can cause mold rot in the wood structure or crumbling drywall.
The areas to check include.
Just a note about shower or bathtub leaks over a garage.
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 gives this may be the problem.
If you have a shower door splash water all around the door and frame.
If you have a second story bathroom the problem could be in.
If you find some you re in for a new shower pan or shower floor to stop the leak.
If your pan or floor looks good try this basic step.
If no water drips out below check closely with a bright light it may not be your shower pan leaking.
A damp spot or worse a continuous drip from the ceiling overhead signals trouble.
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.
Besides this method you can make observations around your shower pan for leaks.
How to fix a leak from the upstairs bathroom.
If you see a leak at this point there likely is a problem with the shower base.
Loose floor tiles close to the shower.
Once you see that the water is coming through the ceiling take immediate action before the leak causes any more damage to your house.