How to key natural limestone

[shanepg]

Guys,

I've got a breathable floor which I am laying limestone tiles on. It's very importnant that the floor remains breathable and this really limits me to the products I can use. The tiles arrived today and unfortunatley they are as smooth as glass on the back! I am assuming that this will make it difficult to get them to seal to the sharp sand and lime I will be using to lay them (no modern adhesives here!). My question then, is how on earth do I key the tiles before laying them? I'm happy to do it mechanically eg rough aluminium oxide but I was wondering if there might be anything I could 'paint' on?

Cheers
Shane

 

[Diamond Pool Finishers]

could you not criss-cross the underside with a 4inch grinder !!

 

[White Room]

Whats the breathable floor your laying on.....

 

[afright]

Sbr ?

 

[Dougs Third Go]

an sbr/cement slurry would be my first thought.

 

[afright]

Ive laid smooth backed limestone, have not had a problem but if unsure use Sbr.

 

[shanepg]

It's a limecrete breathable floor.
I have no idea if SBR will allow water vapour through the stone? I'll look into it though, thanks.
Shane

 

[shanepg]

Turns out the R of SBR stands for rubber. I'm guessing it will thereofre not be breathable.

 

[Concrete guy]

How will you seal the stone and still allow it to breathe?

 

[afright]

How will you seal the stone and still allow it to breathe?

Good point ,also if you are using adhesive will it still breathe ?