They would cut the wall open determine the exact location of the leak and replace the damaged sections.
Drain leak behind wall.
If you have plaster or the leak is behind tile or brick a professional contractor is your best bet.
Mold thrives in moist dark areas which are typically hidden behind walls or under flooring.
If your shower leaks behind wall you will see water stains on the drywall ceiling below the tub drain.
Musty smelling walls will often be accompanied by other signs of a leak e g discoloration.
Then patch the wall sand prime and paint.
Look for signs of leaking.
If you see mold in unusual places where water does not usually accumulate such.
In plumbing in a wall generally you ll be looking for a leak above the area where you have noticed the water but the water you ve found may have traveled far from the leak.
If that doesn t work replace the drain assembly.
Tile leaks occur when water seeps through deteriorating grout or caulk and gets into the wall behind the tile figure a.
Usually the most obvious sign of leaking pipe behind a wall is when you see a huge portion of water bursting through the wall.
If there s a leaking pipe behind a wall you will most definitely spot some causes and changes around that area.
But there are usually some subtle signs to help you identify these types of leaks including.
If given enough time a slow leak can result in very serious structural damage that will make the restoration process longer and more expensive.
If you don t have access beneath the drain cut a hole in the ceiling below or replace the drain assembly with a wingtite drain.
Identify the walls that contain water pipes by looking where pipes go up from the basement and by checking where pipes enter the walls in bathrooms and in the kitchen.
If a pipe springs a leak mold can begin to grow in the area.
Feel around the copper pipes for any wetness from recent use.
To be sure these stains were not from the bathtub drain run a little water in the tub and see if the drain is leaking.
So if there s any pipe leakage in your home you ll face.