The most common causes are the shower pan and or a drain pipe.
Water leaking through ceiling from upstairs bathroom.
Sometimes the leak isn t coming from the upstairs bathroom.
In the upstair bathroom you can try turning on the faucet or shower to flow the water and let check the downstair bathroom.
Is there a leak.
Ceiling leaks from upstairs bathrooms may present themselves as slowly expanding damp spots making their way across your ceiling or they may present as continuous and steady drips.
Other identifying symptoms include.
Either one is serious and demands immediate attention.
Before you move on to fixing the leak the first thing you ll have to figure out is what s causing the leak.
If so exactly the upstair bathroom is a cause of the water leaking from ceiling under the bathroom.
You can usually diagnose the cause of the bathroom ceiling leak with a bit of detective work.
Cut a hole in the ceiling to enable you to undertake a visual inspection of the pipework to see if the pipes are leaking or to see if there is direct leaking from under the tiles.
If the dampness appears only.
If the leaking ceiling or visible water damage appears below a bathroom kitchen or inside ceiling spaces where you know plumbing pipes are located there is a very good chance that the source of the problem lies either with water supply pipes or drain pipes that have developed leaks.
Leaks in the upstairs bathroom can be more troublesome than leaks downstairs because there s a possibility the leak will cause damage to the ceiling and.
Usually there is ceiling space between the upstairs bathroom and the lower ceiling.