Slate over differing floor types

[DHTiling]

It is probably just bitumen based adhesive....so no probs.. if it is a bitumen floor( substrate ) then its a different story....try and see if it scrapes back to concrete before you go any further....

 

[SteUK]

I have managed to scrape small parts away, it is only a thin layer. Looks like concrete under it! As you can kinda see in this pic...not the large area at the back of the pic, the small spots in the foreground. are bits scraped away.

 

[DHTiling]

hi ste.. just scrape all the loose bits off and prime with sbr 50/50 no probs mate trust me.... use a leveller(good quality) maybe something like ardex k15 ....

 

[SteUK]

I am still unsure! After what the guy at Bal tech said today...

Also, if I self level to the existing concrete (see pic below) will that cause issues with the slate? Is it not best to have one type of substrate? i.e. would it not be better to be taking the back concrete part down to the same level as the now 3mm lower old vinyl tile level?

Here are some more images...

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[GazTech]

Prepare just as dh sais..start in the highest room with graded thinner slates, when you get to the point where different levels meet, change across to the thicker ones ....hop this helps....Gaz