Tanking over old tiled surface

[ynot_no7]

Hi there,
I have a leaking shower cubicle and am attempting to put it right. For a number of reasons, including the fit of the hinged door, I will be fitting new ceramics over old ceramics.

I appreciate all of the comments about avoiding tiles over tiles but I am stuck with this option and I have successfully removed the top surface. This was not really a problem and the tiles underneath were mostly sound.

I intend to tank the cubicle by applying the kit to the old tiled surface. I have made it level where necessary with rapid set adhesive and cleaned it with sugar soap.

Can anyone tell me if I need to do anything else to the old tile surface, such as apply primer before I start.

Also, I intend using rapid set adhesive to apply the new tiles to the tanked surface. Is this ok or do I have to prime the tanking compound.

All advice would be appreciated.

BTW, I have picked up some top tips just by browsing this site. Excellent!!!

 

[heavytrevy]

I dont recomend what ur doing but have if you have to ......
Def use a multiprimer for the tanking kit.(not pva )

Trev

 

[DHTiling]

If and i mean IF you have to go this route then i advise you use a taking membrane as these are crack isolation membranes as well and that will help seal the wall breaks from patching area's you have done.

 

[dagger]

sounds like a waste of time and money...IMO

 

[Nardini]

Sorry, but the risk of problems from tiling over is really not worth the work you will be putting into it. What is the problem with just cutting out the old tiles and sorting out the tanking from there? I know it's not easy work, but if the substrate is not sound, you will be re-doing the job several times... Just my thoughts...

 

[dagger]

Sorry, but the risk of problems from tiling over is really not worth the work you will be putting into it. What is the problem with just cutting out the old tiles and sorting out the tanking from there? I know it's not easy work, but if the substrate is not sound, you will be re-doing the job several times... Just my thoughts...

cut off all the layers back to bare, replaster, board or whatever and then tank and retile...a little more expence/effort...job done 10yr guarentee.
to go over a bad substrate is to start wrong and from there it just gets worse...

imo.
Dagger..Lee..

 

[ynot_no7]

Thanks everyone for the advice. The reason I cannot remove the old tiles is because the hinged door frame assembly has been trimmed to fit the levels between two facing walls, each with two layers of tiles. If I remove both layers, the space will be approximately 20mm less so I have opted to maintain the original levels by removing the top layer and tiling over with a tile of similar thickness.

I have 'inherited' this problem and the person I am doing the job for soes not want the expense of a new hinged door.

many thanks for the interest shown and I'm sure I will be back to the forum for more advice in the future.

 

[jay]

good luck trying to find a membrane or tanking system that will garantee that you can extend shower screen :8:

 

[wetdec]

I have a leaking shower cubicle and am attempting to put it right.

Then you will strip it back to the plaster board and start again.......


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