NT wrote:
On Jun 30, 11:12 am, Bolted wrote:
On 29 June, 20:19, Tim S wrote:

Question:
[etc]
Why not just give F Ball/Ardex/Mapei etc a call and ask their tech
advice people which product they recommend and stand behind for this
application*. They will all have one. This is not an unusual issue -
you just need the right product which will adhere to the bitumen
adhesive. . If the SLC is coming up OK, remove that and go over the
adhesive again with the right product which will bond to it.

[*Do not go into B&Q or Wickes and try and find advice in a leaflet or
walk into any old tile shop and ask a shop assistant].

More or less nothing adheres to bitumen. If you want to go this
approach you'd need to blind the bitumen. Heat it till it melts and
sprinkle sand on it. Then adhesives can stick to the sand. But whether
this is a good route to take is another question.


No, dont.

Rip it all up somehow.

Id suggest a kanga type thing to chisel great gouges in the floor.
As long as the new cement can get past the bitumen in enough spots -
and gouges are very good for adhesion - then a little bit here and there
wont screw things up.


NT