Is my tiler using the correct adhesive ?

[DHTiling]

Bonding coat should not be tiled to...it isn't stable enough to hold tiles....and the picture frame effect is true...as far as the air can get it will dry and thats it.......some moisture will soak into the substrate but thats it...Also when pva is used it forms a skin and dose not impregnate the substrate like primers do....so when you apply a dispersion adhesive etc it wets the pva ,,thus making it live again and nothing really holding the tiles in place....so if the pva formed a skin on the substrates surface then thats all the tiles are held with..

Primers seal the substrate from sucking moisture from dispersion adhesives to quickly and with a portland cement adhesive it stops ettringnite reaction....

Those tiles might well hold...we are just trying to tell you the correct way it should have been done....as confirmed by the tech guy you phoned......

 

[graybags]

Update

My tiler took the tiles of the walls around the shower area, where the adhesive had substantially set, but were all re-fixed anyway using the correct cement based adhesive. The job is now complete and we are both happy and talking !

 

[Olz]

Glad you've got it sorted, any chance of you posting some photo's up of the finished job?

 

[graybags]

Will do, once the grouting is done later today. All looks pretty spot on to me !

 

[smurf21]

Use suitable bonding agent on the walls...not pva... and cement based flexi adhesive on the walls or normal cement based addy as long as it contains porcel bond ...ask this guy for his credentialls and then bin them.

 

[graybags]

If you read the thread you will realise that we have been there and done that. The PVA was binned long ago, along with the ready-mix. This guys tiling is spot on and I would have no hesitation in using him again.

 

[grumpygrouter]

If you read the thread you will realise that we have been there and done that. The PVA was binned long ago, along with the ready-mix. This guys tiling is spot on and I would have no hesitation in using him again.

GLad you got all this sorted Graybags and that you have a job you are delighted with, and also that your tiler has also leaned something. You can be sure as shooting he won't pva again and I am sure he would be happy to do work for you again if you were to ask him.

 

[pete f]

:yikes:if he does not know that he needs to use cementitious adhesive on porcelain get someone else my friend the fixed tiles will clean off ok it wont have gone off on monday:yikes:

 

[graybags]

Blimey, I thought this post of mine ended weeks ago, follow this link to the finished article, all sorted, no problems and very pleased

http://www.tilersforums.com/tiling-forum/19027-job-done.html

 

[Dan]

Just bumping some of the older popular (sometimes not so popular) threads. Probably wont be current discussion these days but I just need to do it. So just ignore the thread if it's not current for you.