Dot and Dab tiles!!

[DHTiling]

I think you should state your concerns that :

1 : The adhesive used is really border line for that tile size.

2 : The fixing method does not conform to BS5385.

3 : Cost of rectification of said tiling works.

We have a market place that is flooded with i can do that mentality trades or i have done it for years and never had a problem type..

Stand your ground and insist on it being done to code.

 

[The D]

BSI 5385 7.2.1.5.3
Notched trowelling and buttering method
The notched trowelling and buttering method combines
7.2.1.5.1
and
7.2.1.5.2
and should be used for fixing large tiles (
3.4
) and tiles with
ribbed, deep keyed or heavy buttoned back profiles. A thin coating
of adhesive buttered over the backs should fill the deep keys before
placing the tiles in position on the combed adhesive bed. There
should be no significant increase in the bed thickness.
NOTE This bedding method aims to achieve a solid bed but, in practice,
a number of small voids are inevitable

 

[nat]

Thanks Dave, will let you know how I get on.......

 

[nat]

Dean by the looks of it there are large voids from what I can see, even if they do put it right I don't trust them to do the rest of the work...

 

[DHTiling]

Also when fixing tiles with a Dispersion ( tubbed ) adhesive , it is good practice to have an absorbent substrate or tile body , to aid in the dispersion of the moisture within the adhesive and to achieve a capillary bond.

 

[Dan s]

Don't want to scare you but I fit bathrooms a lot , and if they are that bad at tiling I would say check ALL plumbing joints etc just to be safe.

 

[DHTiling]

Good idea Dan ..

 

[AliGage]

Morning Nat and welcome.

This sort of work is happening more and more each and everyday.

I can't really add anymore than the guys already have. The only thing i will add is although (although its too early for maths so i haven't worked it out) i believe your tile size is just within limitation. Most tubbed adhesive will have a maximum bed depth limit of 6mm. This will obviously be exceeded if dot and dabbing has been done. Hence why you can pull them off with ease.

Personally. And i have sort of had this discussion with someone recently on this forum. The limitations, directions, tolerances and advice are all printed on the product. There is no excuse unless the guy can't read.
I don't know if giving him/them an opportunity to "do it right" is an option. Should of been done right the first time.

 

[DHTiling]

Morning Allister ... 3mm depth springs to mind here... as you say though, packing out with tubbed is a no no.

 

[AliGage]

Yes now yet mention it you maybe right. Sorry mate not long got up. Little fragile this morning.

I seem to recall BAL's tubbed stuff says 3 actually. Had this argument about a moth ago with a "busy" tiler in my area. He's been fixing travertine with green star and wait for it, never had a problem.

Thing is if these people used the correct products they'd make more money. How many tubs must they be going through per bathroom install. Nuts!