Shower tape kicks out

[MortarThePoint]

I've fitted Classi Plus tape to the edge of the bath against the wall. The wall has a slight bulge in the middle so at the ends of the bath there is an approx 3-4mm gap (image below). The Classi tape itself is thicker than I'd like, but that's what it is. My main question is can the tiler build out the wall here to compensate? @nod is that standard stuff or am I facing a problem?

[Nickfromwales]

You (tiler) can build that out with cementitious flexible tile adhesive, no problem at all. Just dub the low areas out in a few sets to get the wall spot on for a nice even finish, and a good consistent line across the bath edge (so you can’t see that the wall bellies basically).

Do not use acrylic/ready mixed stuff there whatever you do!

[MortarThePoint]

1 hour ago, Nickfromwales said:

Do not use acrylic/ready mixed stuff there whatever you do!

 

I've got a tiler coming so hopefully he won't want to use that. Is that stuff more for the DIY market?

[nod]

Yep

no issue for the tiler 

[Nickfromwales]

21 hours ago, MortarThePoint said:

 

I've got a tiler coming so hopefully he won't want to use that. Is that stuff more for the DIY market?

It’s just not something you can use where you need to dub out areas as it doesn’t ever dry out when applied over 3-5mm thick. Particularly bad where it’s a constant splash/wet area, or where a porcelain tile is being used (due to its lack of porosity).

Acrylic works fine on new open plaster/plasterboard, and with a porous ceramic tile, but I simply stopped using ready mixed adhesive as it is just too inferior to cementitious stuff to ever risk it. Proper DIY imho.

If you’ve tanked also, then it’s 10x worse again, especially if you need to grout the next 24/48 hrs, as this stuff really needs the grout lines to allow the moisture to evaporate/escape.

I used it once over tanking, with porcelain, and 2 days later I removed the bottom batten and the tiles just started sliding down the wall in front of me. 
Whole wall was taken back off, adhesive in most places was wet enough to put back into the tub and be removed complete with a wet sponge, never used that stuff again after that tbh. 

Edited November 1 by Nickfromwales
Typo

[MortarThePoint]

1 hour ago, Nickfromwales said:

never used that stuff again after that tbh. 

 

I can appreciate you want something that goes off through reaction rather than simply drying out since it's between a waterproof tile and waterproof tanking. Do the ready mix ones go back to sloppy when they get wet too (i.e. not waterproof)?

 

Leaving grout off for a while sounds a good idea when tanking has been used to let the moisture out. I can see it would be slow though as the moisture has a fair way to go, particularly on larger format tiles.

[Nickfromwales]

19 minutes ago, MortarThePoint said:

 

I can appreciate you want something that goes off through reaction rather than simply drying out since it's between a waterproof tile and waterproof tanking. Do the ready mix ones go back to sloppy when they get wet too (i.e. not waterproof)?

 

Leaving grout off for a while sounds a good idea when tanking has been used to let the moisture out. I can see it would be slow though as the moisture has a fair way to go, particularly on larger format tiles.

Yes, the ready mix reconstitutes with water, so is the anti-christ of adhesives for wet areas.

I told my mate not to use it, he had a mate tiling who ‘recommended’ it (as it’s simple and easier for a lot of lazy tilers) and all the tiles around the base of the wet area of the shower just literally washed away over the subsequent weeks (glass finger mosaic panels). 
 

Cementitious stuff absorbs moisture as part of the curing process, so you can grout the next day and it’ll be bombproof. 
 

I’ve been tiling for north of 30 years, thats where this advice is coming from. @nod prob been at it longer at it than me.