Need help with uneven concrete floor

[timsterboss]

Hello, before installing LVT I need to even out the concrete floor but it's difficult how I should proceed..

Should I use self levelling compound or concrete + sand??

Thank you

The first picture - 2 to 4mm gap between lounge and dining room
The second picture - 8 to 12 mm gap between kitchen and dining room
The third picture - 5 to 8mm difference

 

[thomp1983]

Self levelling will do upto 10mm in one go, I'd imagine it would be ok at 12mm.

Id probably drill a few screws into the worst dips with the heads all about 1mm below finish level to give you an indicator when spreading the compound out otherwise over a large area it can be difficult to guage if you've enough in the low spots