Shower Stall is leaking through the floor
I have a stand up shower on the second floor of the house.
We've had two chronic issues lately.
The hot water faucet is difficult to shut off and sometimes takes a lot of pressure to shut off
Second, the shower often fills with water and is slow to drain.
Last night we developed a steady drip through the ceiling on the first floor. One right below the shower and the second is in the dining room about 8 feet from where the shower is. Since there is no plumbing above the dining room we assume water is running across a beam somewhere.
Here is the issue. Prior to calling a plumber in how can we find out if the leak is from the faucet or the shower floor? We've shut off all the water in the house and it still slowly drips. In the last 24 hours it is has dripped about a gallon.