Walk in showerproblem

I just had a handicapped accessible tiled walk-in shower installed. The floor is concrete with a vinyl pan and 2" ceramic tiles set in grout.
Because it wasn't pitched properly it is pooling water and puddling in sections. The contractor wants to repair it by adding a new layer of properly pitched grout and new tiles over the old. Is this feasible or is it necessary to tear up the floor and install a new vinyl pan, grout and tiles?
Any advice would be appreciated.
RF
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Sounds to me thathe is on the right path...
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I would not want an new layer added over the tile. Then you would have to raise the drain. My opinion is tear it out and do it correctly.
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but the mud bed can be repaired without a complete tear out....
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Sure can but you still need to raise the drain! Could loose another inch or two causing more problems not yet considered. I used to hoddy for a tile setter. He never used old beds no matter how good they looked. I was my job to do the removals as well as mix the mud.
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Why would you have to raise the drain if you tear the tile out? It sounds to me like he has some low spots that need repaired and this can be done without tearing the whole floor assembly up. Hopefully the pan was put in properly with a pre-slope under the liner and something to keep the weep holes from clogging with mud. The low areas can be fixed with thinset unless it is that bad that you need more than a 1/4 inch. If it's that bad it would be time to find a new tile mechanic. I've screeded 10s of thousands of feet of mud and sometimes s*it happens. No one is perfect all the time...
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