bill wrote:

I am sure this is a stupid question but can someone tell me why I shouldn't
lay floor tiles straight on to cement rather than a tile adhesive? I need to
raise the floor level by about 25mm in addition to the adhesive/cement and
tile so if I have to use adhesive what do I fill the remaining 25mm with?

Thanks in advance.


Adhesive IS a sort of cement anyway.

Its a bit tougher and less prone to shatter than a weak screed mix, and
similarly priced to a strong screed mix.

There are a range of formulations each one a little different - some
fast drying (useful) some flexible) useful.

I would recommend however, that you use a strong mortar mix or self
levelling to get down to an accurate 12.5mm bed and use rapid set
adhesive for the actual tiles.