Is my tiler using the correct adhesive ?

[White Room]

Out the door might be more appropriate:yikes:

 

[cornish_crofter]

Don't use PVA

Don't use tubbed adhesive on 450x450 tiles.

Don't carry on with the job until you have cleaned off all the PVA.

Use the correct adhesives and prepare as instructed on the back of the bags.

 

[graybags]

Call me old fashioned, but I'd prefer not to just accuse him of doing it wrongly, but simply ask why he is using certain adhesives, preparations etc, when "isn't X,Y,Z what is more usual"

I think I am right in thinking that cement based adhesive is the best choice because it goes off by chemical reaction, not evaporation, the latter being impeded by large format, non porous tiles where moisture will take an age to disappear, but what is the story about PVA ?

 

[Leatherface]

Just to point out there are a couple of tubbed ready mixed adhesives that are suitable for porcelain tiles, though large format porcelain do not fall into that bracket
Granfix Multifix is one of them ...
http://www.tileadhesive.co.uk/PDF files/Multifix Adhesive.pdf

Also this adhesive is self priming, so no need for pva or any other primer

 

[grumpygrouter]

Call me old fashioned, but I'd prefer not to just accuse him of doing it wrongly, but simply ask why he is using certain adhesives, preparations etc, when "isn't X,Y,Z what is more usual"

I think I am right in thinking that cement based adhesive is the best choice because it goes off by chemical reaction, not evaporation, the latter being impeded by large format, non porous tiles where moisture will take an age to disappear, but what is the story about PVA ?

PVA will become "live" again in contact with moisture. Dispersion adhesive contains alot of moisture so the pva will not do vey much apart from become slippy. There is a very good thread on here about primer v pva which I am sure Dave has a link for and will post it up for you.

 

[grumpygrouter]

Just to point out there are a couple of tubbed ready mixed adhesives that are suitable for porcelain tiles, though large format porcelain do not fall into that bracket
Granfix Multifix is one of them ...
http://www.tileadhesive.co.uk/PDF files/Multifix Adhesive.pdf

...as is Ardex D30, but not large format and you must have a porous substrate.

 

[Leatherface]

Grumpy
did you get my PM ?

 

[cornish_crofter]

PVA will become "live" again in contact with moisture. Dispersion adhesive contains alot of moisture so the pva will not do vey much apart from become slippy. There is a very good thread on here about primer v pva which I am sure Dave has a link for and will post it up for you.

This one Russ?

http://www.tilersforums.com/tile-adhesive-grout-prep-forum/2511-p-v-versus-primers.html

 

[grumpygrouter]

Grumpy
did you get my PM ?

No Leatherface I didn't. Send it again?

 

[grumpygrouter]

This one Russ?

http://www.tilersforums.com/tile-adhesive-grout-prep-forum/2511-p-v-versus-primers.html

The very chap Hugo.