First you have to expose the leaking pipe by taking out the section of the wall where the leak is.
Water spraying out of broken pipe behind bathroom wall.
It was hidden behind the drywall but the spraying was audible from the wall and the surface of the wall was wet.
Cpvc is rigid and breaks very easily.
The most common pipes you will find behind the wall are polybutylene and cpvc.
Stabilize the fitting with a separate pipe wrench while you do this.
If the pipe is dry the leak is at the fitting.
Hold a paper towel napkin or piece of toilet paper on the pipe above the joint above the nearest fitting that you see leaking.
This pipe though fairly new had a pinhole leak that was spraying water into the wall cavity between wall studs.
Paint peeling from the wall in and around the shower is one sign of a leak.
Try to scent the smell of sewage.
Polybutylene pipe has plastic fittings that can break and it develops pin hole leaks easily.
Dripping or spraying water in the wall will soak the plasterboard or drywall.
The broken pipe is most likely located behind the wall.
The wall s wetness started about 5 feet from the floor so it was clear that the leak was above that point.
If the fitting won t turn which is likely spray lubricant on it wait five minutes and try again.
Search exposed basement pipes for corrosion and mould.
If the pipe is wet.