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2 sides should be male and 2 sides female ?

Scrape anything loose A 3-5mm coat of ardex na Epoxy DPM1c or similar Glue straight to that.

Also you most probably need to use an epoxy Dpm over the 1st coat of smoothing compound as that subfloor won’t have a visqueen Dpm sheet I’d guess. What year was the house built.

Lots of reasons and the main one is because it’s crap. It won’t stick properly due to being a water mix and not a latex screed. It’s not moisture tolerant which you need with that sub floor. Ardex na is the best for that type of sub floor as it’s a bag and bottle ( latex ) Others you can use...

You be better using ardex na over that now if the adhesive is solid

That subfloor won’t have a Dpm so you need to do a Dpm butty Ardex way Ardex NA DPM1c ardex Na Fball way Fball 1200 pro F77 Fball 1200 pro

2 coats uzin PE404 Grit primer Ardex CL smoothing compound

Any Dpm sheet over older then 1990 I wouldn’t risk going over it without a liquid Dpm as it will be perished in places. you don’t but any primer under a liquid Dpm unless it’s a epoxy primer. Go with ardex DPM1c or Fball F77

what adhesive did you get ?

You need a super smooth surface to bond to. A cement screed isn’t good enough and imperfections will show through the LVT. Needs to be on 3mm minimum. You need a A2 notch trowel as well to glue it. How long has the screed been down ?

If glue down ( dryback ) LVT No , you need to put a smoothing compound down. If Click LVT you should be ok. Needs a moisture test in the slab 1st though.

I’d just go 9mm plywood over the top

Ardex na

What the hell has he used ? Way too much water in that. Also has he fixed the plywood down with staples ?

Hard job. We use a bully stripper which is amazing but costs a lot

Make sure you prime the floor 1st

Remove the tiles then plywood it all at 5.5mm

Looks like the chipboard is rotten. You need to get all the old flooring up and out and let the chipboard dry out by letting it breathe. Then see how much of that needs replacing.

I’d say it’s moisture. You could do with putting down a moisture suppressant.

Have you done the screws every 6” on the ply and every 4” on the perimeter of each side / joint