I have a 1-story home with a completely finished basement. The bath and bedroom downstairs are next to one another. When the bathroom is used several times, the bedroom, closet and hallway spring a leak.:eek: I thought it was the drain pan under the tile shower, but someone has told me it could be a leak in the pipe beneath the slab. How do I find out without busting up the entire floor? The bathroom is all tile. It's causing a mold problem and I need to find, once and for all, where the problem is coming from. The house is about 36 years old.

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When the bathroom is used several times, the bedroom, closet and hallway spring a leak

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Please explain what you mean by "used"? When what's used? Toilet? Bath? Shower? What? I need more information.
Does it leak when nothing's draining or flushed? In other words is it a steady leak?
If the answer's no then it's doubtful you have a pipe that leaking under the slab.
The shower's the most likely culprit. Is it a tile or a manufactured base and enclosure? Let's check it out. Remove the shower strainer and stuff a baggie filled with damp rags to seal off the drain. Now run the shower until you have a inch or so of water. Let it set for a few hours and check for moisture. Let me know what you find. Good luck, tom