Looking for advice on slate floor on anhydrite screed.

[Spare Tool]

It is all about using the correct gear for the purpose.... no decoupling mats 2000 years ago.

And no 12mill travertine or Polypipe either

 

[One Day]

C'mon guys, how do you think the Roman baths fellows laid stone, in the incredibly hot steam houses?

It is all about using the correct gear for the purpose.... no decoupling mats 2000 years ago.

No direct bonding to poor quality substrates either. I know there's no need for uncoupling a lot of the time, but an uncommissioned heated floor of dubious quality, combined with thin, weak stone... That's getting uncoupled. And if a customer will pay for it (and generally they will if i spec' it) then why the heck not?!

 

[Old Mod]

I thought they did decouple with sand

In fact they did, it's explained in one of Schluter's Ditra video's.
The sand was used beneath the floors to decouple it from the building, that way the building would settle, and the floor would stay in tact.

 

[hmtiling]

In fact they did, it's explained in one of Schluter's Ditra video's.
The sand was used beneath the floors to decouple it from the building, that way the building would settle, and the floor would stay in tact.

Was beginning to think i'd made that up

 

[Bill]

combined with thin, weak stone...

This is the cause of most of the problems.... customers scrimping or think they are getting a bargain stone.

Most stone floors used to be 2omm minimum. Some of the trav I have fitted recently is like tracing paper.

 

[Italy]

C'mon guys, how do you think the Roman baths fellows laid stone, in the incredibly hot steam houses?

It is all about using the correct gear for the purpose.... no decoupling mats 2000 years ago.

 

[Bill]

Can't be me Antonio, Sketch Tom has hair...........

 

[Italy]

Can't be me Antonio, Sketch Tom has hair...........

It is a crown

 

[One Day]

Antonio likes his women to be skinny?

 

[Italy]

Antonio likes his women to be skinny?

is the same for me, I fit, lean, fat, high and low. important both female.

 

[WetSaw]

Non le "signore" della tangenziale di Bologna?

 

[One Day]

Not the Lord of the bologna ring road?!
What type of euphemism is this???

 

[WetSaw]

The " ladies" on the Bologna ring road aren't ladies....or even female ( so I'm reliably informed...)

 

[SJPurdy]

In the old floors the layer of sand (or multiple layers of building paper/polythene) which acted as a slip plane was underneath the solid 'screed' layer. We still have this today in a simple concrete floor it is the blinding layer of sand on top of the hardcore and/or the layer of insulation board. In a screeded construction in will be the insulation layer between the concrete and screed. The Romans as far as I know did not put in an extra 'plastic' decoupling layer between the solid base and the tiles (mosaics). All the Roman tiling I have seen (or can remember seeing) was mosaic tiling so there are lots of joints to distribute stresses amongst.
The point I am trying to make is that the uncoupling layer we use in tiling, between the tile and base is an extra layer and not instaed of the slip planes under/in the base.