I have checked around the outside of the house and found no wet areas.
Carpet wet at wall base near roof vent pipe.
This is the simplest way to tell that you have a water leak in your walls.
If it s on a slab it could be any of the above mentioned things drain or water pipe leak a vent leak on the roof or it may be ground water seeping up through the slab.
Vote unless the wall involved is a masonry wall that is partially below grade with water collecting at the base my bet would be you have a roof leak.
The temporary fix was to rip up the carpet knock a hole in the concrete slab repair the leaking pipe fill in the hole with quickcrete cement and restretch the carpet once it and the pad had dried.
Paint or wallpaper peeling.
Other possibilities besides a leak in a pipe would included a roof flashing around a vent pipe leaking.
You should go outside durring a rain storm and if this wall is at grade level see if there is any ponding near the foundation or bottom of the wall.
Unattended wet carpet is prone to mold and mildew.
If you have damp patches bubbling paint crumbling plaster or powdery deposits on wall surfaces close to the floor rising damp is probably the culprit.
So if a full wetted circle in the carpet the leak is about at the center of the wetted circle usually meaning came from above through a ceiling fan or light fixture but could also be from an in floor heating loop system if in concrete floor or if a wetted area extending away from the wall in an arc but only wetted at one wall find the.
Mold is incredibly toxic to humans and pets.
The wet area is about a foot from the closest wall and about 8 feet or more from an outside wall.
This normally happens when the sheetrock behind the wall has absorbed too much water.
If the stains on your wall continue to get bigger this is usually a good indication that there is a hidden plumbing leak.
Get a fan and blow air across the carpet to dry it.
Look for standing puddles of water near a wall.
Rising damp usually occurs in masonry.
If there are no water pipes running under the floor that are leaking and your roof is not leaking you have looked up made sure nothing is dripping from above right you definitely need to.
When you leave moisture sitting in a warm dark place these toxins will invade your home and once moisture and mold permeate a carpet pad it s impossible to eradicate.
Too much moisture behind the walls can eventually cause paint and wallpaper to start peeling or bubbling.
