Wet room floor tiled without tanking membrane, is that ok?

[Noah1234]

Hi,
Anyone had experience in having a wet room tiled without the tanking membrane?

The builder who is doing the bathroom I realised now that he doesn't seem to know how tanking works, as he did not put the membrane on the floor before tiling it!
He said he tiled many bathrooms before this way and they never leak, I am not sure what to do now, if anyone has experience with that please share it.

Thank you.

 

[DH6]

Rule number 1, never let builders do anything other than build!

Yes it should be tanked underneath, eventually water will get through cracks in grout etc under the tiles affecting the substrate below and they will become loose.

 

[Doggit]

Unless you're going to start taking the tiles up, then you either keep an eye on the grout, or you remove it now, and replace with an epoxy 2 part grout. Tanking membranes are a recent invention, and they are really an insurance policy for a crap job. If the guys done the job properly, then you should be fine.