I've read all the posts here on this, and the sticky, but there doesn't seem to be a definitive answer that gives me real confidence.
I need to lay ceramic floor tiles on a concrete (or screed) floor, that has had those typical Council style tiles fitted to it with a smear of bitumen.
The bitumen is not tacky any more (I think it was laid in 1978), in fact we were able to lift a lot of them by pulling the edges with fingertips, the rest quite easily with a paint scraper. It is mostly literally a smear, maybe 0.5mm at most, and has between 50% and 90% coverage.
We've been told to use an additive in a powder adhesive (additive as yet unknown-still waiting to hear), and someone else has said to coat the floor with SBR mixed with Portland cement.
Here I've read to prime the floor with something like Weber iboprim, and also I think I read just go for it.
Given our situation, which by the way is for a kitchen running into a dining room, what really is the best thing for us do do?
I need to lay ceramic floor tiles on a concrete (or screed) floor, that has had those typical Council style tiles fitted to it with a smear of bitumen.
The bitumen is not tacky any more (I think it was laid in 1978), in fact we were able to lift a lot of them by pulling the edges with fingertips, the rest quite easily with a paint scraper. It is mostly literally a smear, maybe 0.5mm at most, and has between 50% and 90% coverage.
We've been told to use an additive in a powder adhesive (additive as yet unknown-still waiting to hear), and someone else has said to coat the floor with SBR mixed with Portland cement.
Here I've read to prime the floor with something like Weber iboprim, and also I think I read just go for it.
Given our situation, which by the way is for a kitchen running into a dining room, what really is the best thing for us do do?
