adeshive for slate

[richard]

Hi does anyone know if you can get away with useing quick dry ceramic adhesive on slate it will be going down on screed
Thanks

[Fred]

I'd use SPF , if your quick use rapid, I prefer slow set on slate.

[richard]

Whats spf

[richard]

i was thinking of useing ceramic adhesive because its half the price & i cant see any reson why you cant use on slate, any thoughts on this

[pjc]

i was thinking of useing ceramic adhesive because its half the price & i cant see any reson why you cant use on slate, any thoughts on this

Ceramic adhesive cement based No reason at all Richard just butter the backs :Pete

[richard]

Cheers pjc thats what i wanted to hear

[mz30]

Ceramic adhesive cement based No reason at all Richard just butter the backs :Pete

Sorry,got to ask ,why does he need to butter the backs?

Not tring to be rude, just wondering why he should do that?

To answer the original question,i always use rapid set on all the floors i do,slate ,granite etc.

[Fred]

Whats spf

single part flexi..........not 2......like powder and liquid gear

[trev]

im with mz30. one part flexi rapid set on floors all day long.

[deanotile]

Sorry,got to ask ,why does he need to butter the backs?

Not tring to be rude, just wondering why he should do that?

To answer the original question,i always use rapid set on all the floors i do,slate ,granite etc.

Just to let you know you butter the back to allow for good adhesion as slate has uneven surfaces.

[Alberta Stone]

If the slate is not gauged then it will be different heights and it is rough.
Even if it is gauged it often has pits and they need to be filled.
Always back-butter stone.

[richard]

So a rapid set cement based ceramic adhesive will do for slate then, dont see why it has to be flexi its going down on screed

[TilingLogistics]

So a rapid set cement based ceramic adhesive will do for slate then, dont see why it has to be flexi its going down on screed

Theres virtually no difference in price and you might as well err on the side of caution with slate and use Flexi as there can be many hidden faults in slate and it can only help IMO

Kev

[whitebeam]

And the customer may want walk on them when your not there

[pjc]

you should butter the backs of all floor tiles unless you are using PTB to allow for a solid bed

[ellolly]

No need for flex onto a screeded floor, just make sure the screed has dried out properly..

[mz30]

you should butter the backs of all floor tiles unless you are using PTB to allow for a solid bed

Sorry to disagree ,but that is not the way to lay floor tiles,i've been in the game a long time and have never come across that,even on slate ,gauged or not "slate tiles are machine cut"have a flat back .

Back buttering does nothing besides waste adhesive,if you use the correct depth serrator for the job then you will acheive the correct amount of coverage for the tile.

If you have to back-butter,then the substrate is not flat,that would be the only reason i would do it.

[Dave Ramsden]

Personally grey rapid SPF.
I only butter the back of travertine with the back edge of my trowel. Ive done plenty of slate work and never buttered the back.

Be sure to pres the slate before fixing

[whitebeam]

I tend to find with porcelain that the backs can be quite deep and the addy on the floor is not giving enough coverage so have to back butter. IMO

[Dave Ramsden]

Use a deeper trowel

[whitebeam]

Then your still using extra addy whatever way your doing it

[mz30]

I tend to find with porcelain that the backs can be quite deep and the addy on the floor is not giving enough coverage so have to back butter. IMO

Like i said if you use the correct serrator then there is no need,as an example i recently worked on the new debenhams in blackpool ,1000's of metres of 600x600 porcelain used a 12mm thick notch serrator ,as you do you lift a few as you go,believe me there is no need to back butter tiles.

As for using extra adhesive if your putting a quote in and you know you need to use a thick notch then your not using extra adhesive.

Using a thin notch and back buttering is like doing the job twice ,IMHO

[Dave]

Sorry to disagree ,but that is not the way to lay floor tiles,i've been in the game a long time and have never come across that,even on slate ,gauged or not "slate tiles are machine cut"have a flat back .

Back buttering does nothing besides waste adhesive,if you use the correct depth serrator for the job then you will acheive the correct amount of coverage for the tile.

If you have to back-butter,then the substrate is not flat,that would be the only reason i would do it.

Thats not fully true there....I have fixed slate that is rough split and not machined at all..and this dose need back buttering to achieve a solid bed....

[deanotile]

Thats not fully true there....I have fixed slate that is rough split and not machined at all..and this dose need back buttering to achieve a solid bed....

me 2

[Alberta Stone]

It is nice to work with quality material which has a factory finish back which you can install as you would with tile, but slate has become such a trend that there is a lot of cheap, rough product being flogged lately.
Variance in thickness from over 3/4" to 1/4"
Bowed and cupped and wavey tiles
Tiles that are parallelogram rather than square
I often spend a fair bit of time with a stiff putty knife chipping off the loose flakes and checking each piece for integrity to make sure that it doesn't have a split along a side.
When working with product like that it is impossible to fix it as if it was tile, even with huge notches on the trowel.
It is stone veneer and so you often have to back butter sometimes with the notched side of the trowel rather than with the flat.
That is, if you like the finish to be all of the same level.

[LM Ceramics]

personally richard i always use a rapid set flexi adhesive for any natural stone ven porcelain better to be safe than sorry

[Grace'sDad]

Thats not fully true there....I have fixed slate that is rough split and not machined at all..and this dose need back buttering to achieve a solid bed....

Me too, and I'm fixing 15sqm of this "moon rock" slate tomorrow.
It's 600x300 and has massive deviations in height.
I'll be back-buttering like there's no tomorrow because I'm pretty sure I still can't buy a 40mm notch trowel!

[Fred]

I only back butter when theres those deep dimples in the underside of a tile.

[poppyniks]

rapid set flexi for me too, personally never had to back butter any slate i have done at all , my mate uses just rapid not flexi and he has had no probs either , so both will work , the same as back buttering them , personal preference i feel unless its obvious you need to ,
good luck , let us know how you get on

[Dave Ramsden]

No probs, 12mm trowel and a good labourer bring ing the sticky. Dot n dab the thin stuff but make sure theres a decent bed under it. Grout it n seal it !