Anhydrate floor, best adhesive

[Old Mod]

Generally speaking, unusual conditions notwithstanding, u would just prime plaster, and as long as its fully dried, prime as per instructions of your chosen adhesive.
Even if the tiles exceed 20KgM2 unless the plaster is in a bad state of repair, you still wouldn't need to remove the plaster.
U can overboard directly over it.
U would still prime first, then stick the Hardie to it with adhesive plus you would have the addition of mechanical fixing,which is standard practise anyway.
The adhesive is not used primarily to adhere the Hardie,the mechanical fixings are there for that!
The adhesive is used to take up any unevenness in the substrate.
Why would u suggest ready mixed anyway?
I don't actually remember the last time I took a lid off a bucket of adhesive, truly I don't!

 

[Lee@emctiles]

Might have to venture on down to my "lab" and whip out a bag of the TM anhyfix and put it through its paces..... which i guess tilemaster, granfix etc have already done.

TM Anhyfix is made by Tilemaster!

Test away, think you'll then find why alot are buying it

 

[Dan]

This next question may be worth its own thread but will start it here. Do you A... use a gypsum based adh to tile onto plastered walls, B... prime then cement based, or C... rip off the plaster and overboard with hardi? (We are saying the tiles are under 20kg but too big for readymixed.)

Prime and cement-based.

 

[Tile Shop]

Ok. Thats the way i always thought until the gypsums came out. Then i got confused

 

[MW Smith Ceramics]

Bal

I spoke to one of the guys at BAL, regarding their competitors making Gypsum based adhesives and them not. He said that its not recommended as if it comes into contact with water after it has cured, it can crystallise and blow the tile. They will only ever recommend a cement based adhesive, once Primed with APD.

More commonly than not, the gypsum adhesives are only used in dry areas because of this. But with most grouts being water resistant instead of fully waterproof, when say a kitchen or hallway floor is mopped on a regular basis, then I guess water must go through to some extent???

I also read that this crystallisation can occur when coming into direct contact with cement. So I suppose that's why it needs fully priming. But the grouts are cement based too, so that will come into contact with the adhesive and cause the crystals to form at the edges of the tiles???

For that reason, i'm currently with BAL on this unless someone can put my mind fully at ease that the Anhydrite adhesives won't fail for the above reasons. Are there any precautions that can be made?

have said the same thing to me, they say prime with apd then go on floor with an S1 and that this is to British standards and that British standards doesn't state anything regarding gypsum based adhesives onto anyhydrate......so I've worked for big tiling contractors and anyhydrate adhesive was never used, always a special primer called PCi 303 I think then s1 but since I've been working for myself I have used tile master anhyfix as screening contractors have actually told me not to use cement bases!!!.....

 

[One Day]

i'm fixing 350sqm soon.
I'm going to prime with TM primer and fix Ditra with TM Anhyfix.
Then tile using cement based adhesive. I'm still not sold on the longevity of gypsum based adhesives...
Time will tell though.

 

[MW Smith Ceramics]

i'm fixing 350sqm soon.
I'm going to prime with TM primer and fix Ditra with TM Anhyfix.
Then tile using cement based adhesive. I'm still not sold on the longevity of gypsum based adhesives...
Time will tell though.

Hi impish ,

What would you do if it was a geometric floor??.....

 

[MW Smith Ceramics]

Regards prep that is??....

 

[MW Smith Ceramics]

With a gypsum screed?

 

[MW Smith Ceramics]

What size tiles are you working with on that beast of a floor impish?.......good bit of meterage there bud

i'm fixing 350sqm soon.
I'm going to prime with TM primer and fix Ditra with TM Anhyfix.
Then tile using cement based adhesive. I'm still not sold on the longevity of gypsum based adhesives...
Time will tell though.

t