Natural slates onto concrete blocks - Tile Advice

[mikrt]

Hi forum,


I'm about to fix 20 M2 of natural slate tiles, 300mm x 300mmx 10mm onto standard concrete 4" blocks internally.


I got the slates at a good price, but the seller is trying to get me to buy primer and adhesive off him as well.


I may well need them, but thought I'd check with the experts first.


Adhesive is Ultra Tile ProRapid RS and primer is Ultra Tile Prime IT FP Flexible Primer. I know I need adhesive, and this seems OK, but would I need primer too? The adhesive is cementitious so don't see the need for primer with concrete blocks.


While on the subject, should I seal afterwards also? They'll be in a stairwell so won't be getting wet or wear & tear.


Thanks in advance,


Mike.

 

[Ajax123]

It's doomed. Natural stone direct to concrete blocks is not a good idea. Line with backer board or plasterboard