The Floor Leaks The Ceiling Creeks

A refrigerator with a blocked defrost drain for example can lead to ice buildup causing melted water to leak out and seep into the floor and onto the ceiling of the lower floor.
The floor leaks the ceiling creeks. A squeaking noise is often the result of friction between two boards. Again many people think that standing water is due to it coming through the floor and while it might have you must also check the ceiling. You might want to go check for signs of moisture around and under your washer. This can be easily fixed by creating a kerf or gap image 2.
In rarer situations the actual toilet or tub plumbing may have sprung a leak. Screw type fittings especially in drain traps are more likely to leak than are glue type fittings. 7 places to check for water leaks most common water leaks in your house duration. Where to find water leaks.
Each time the tub is used splashed or draining water leaks through the floor and comes through the ceiling. So first look for any signs on the ceiling for water damage. A possible cause of a ceiling leak in a two story house is an upper floor bathroom.