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Sounds like you might have a blockage in the drain lines. Two showers running and more water goes in the drain causing it to flow back up from the bottom of the toilet. Get a plumber out to clear the line. If you have no confidence in that plumber get another one.
In other words - lots of possibilities I have tried several of the suggestions but find nothing. The plumber who did the plumbing for the house says it can't be a plumbing issue because water can't rise up from under the tiles. Have a different plumber scheduled here soon. The problem is, no one has any idea where the pipes under the slabs are and how the plumbing is routed in the house. There was no plumbing plan by the builder. New house.
In other words - lots of possibilities I have tried several of the suggestions but find nothing. The plumber who did the plumbing for the house says it can't be a plumbing issue because water can't rise up from under the tiles. Have a different plumber scheduled here soon. The problem is, no one has any idea where the pipes under the slabs are and how the plumbing is routed in the house. There was no plumbing plan by the builder. New house.
You can determine the underground piping by having a plumber run a camera through the piping which will locate all waste piping and branch lines as well as depth and if there are any major issues.
I’m thinking you first need to test the shower base unless you’ve already eliminated that!
You can determine the underground piping by having a plumber run a camera through the piping which will locate all waste piping and branch lines as well as depth and if there are any major issues.
I’m thinking you first need to test the shower base unless you’ve already eliminated that!
SHower base next step. Noticed today that the floor of the water closet sounds solid on one side of the area, but on the side adjoining the shower, when tapping it, it sounds hollow.
SHower base next step. Noticed today that the floor of the water closet sounds solid on one side of the area, but on the side adjoining the shower, when tapping it, it sounds hollow.
Most likely the backfill material around the plumbing was not properly compacted and has settled, however that issue should have nothing to do with your leak issue.
I’m also guessing the water by the toilet is not leaking from the wax seal but if so, I guess you would have already identified that!
I think the key is that leak is only when two of you take shower closer to each other. It means more weight on the center of the shower base. If the shower base drain is not properly plumbed (say, not enough plumber putty, or not a straight angle connection, or something else), then weight from both of you in the center can open up a small hole/crack between base and the drain, allowing water to pool under the base. From there on, if there is any route to the middle of the water closet under the tile, water will travel there and yes, it can pool via small cracks (shower base is almost always higher than tile in in the adjacent water closet).
Easy way to test - load something heavy in the center of the base (to approximately match combined weight of both of you), turn water on and see what will happen.
Most likely the backfill material around the plumbing was not properly compacted and has settled, however that issue should have nothing to do with your leak issue.
I’m also guessing the water by the toilet is not leaking from the wax seal but if so, I guess you would have already identified that!
Correct - not leaking from the seal.
I'll keep on searching. (Or just stop showering )
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