Noticed a spot on the wall and moisture in the corner closet adjacent to a bathroom toilet. Also noted some mold around the base boards in the corner of the closet. Had a plumber come out. He didn't think the toilet had anything to do with it. He didn't think the ring or toilet needed to be reset. Opened the wall int he closet and the plumber didn't think the pipes he saw had any issue either. No rust on the copper pipers, studs or screws either. With in the wall the floor is damp but not the walls. No visible mold was noticed and no smell. Wet dry vacuumed the damp sandy floor area in the wall. We have been monitoring for a few weeks and the floor is still damp in the wall. The tile around the wall is cool. I don't hear running water. How can we figure out if there is a leak and where it is coming from? A remediator who I had come out said it could be a leak from the roof. He didn't bring any tools or open the wall to look. We went on the roof and did not note any cracks in the shingles. Everything looks/feels dry on the wall area where we opened. Advise on next steps please.

 

On what floor is this area?
Is this house on a concrete slab?

 

The floor is tile. The house is on a concrete slab.

 

You can have water leaking in from above either through the roof, a window or through a crack in the wall. Water can also enter where the wall meets the slab. And, a considerable amount of moisture can wick up through the concrete.

 

Thank you. It is not near a window. A remediation company came out and said it is either the toilet ring or the roof. However, they didn't bring any equipment or look in the wall. A plumber looked in the wall and felt it wasn't caused by the pipes connecting to the toilet or the toilet ring. I don't want people guessing and ripping up the house for no reason. Looking for advice for next steps. Thanks,

 

If it's not the plumbing that leaves a possible roof leak.
We can't help you much there. You need to visually inspect what is above that area.
Possibly you have an attic ?

You won't always see a visible crack in the roof.
Areas of concern are roof valleys, chimneys, change of roof direction.
If you have an attic that would be the next area to inspect.

Feel free to leave pertinent pictures for review..... How to insert pictures.

 

"...said it is either the toilet ring or the roof."
If you have had people out to actually inspect your problem their advice is probably better than from strangers on the Internet who can't see your house. The plumber crossed the toilet off the list leaving only the roof. So, someone needs to get up there and inspect it.

 

Unfortunately, it will take a combination of exploration and trying different things to find the leak. As others have said, you're probably past the point of a big gaping hole somewhere that's easy to find.

You'll either probably need to open up more of the wall to determine if the water is coming from above or wicking up from below. The problem with water is that it does tend to travel, so it's not always immediately apparent where it's coming from.

Do the water pipes go down into the slab? Or only through the walls/ceiling?

I agree, the roof is likely the next place to check. If there's a valley or flashing in that general area, it might be hard to find the specific leak, but those are places that leaks often occur.