Yeah, 2 x 10kg would be what was needed to put it down at the right microns. We tend to paint it on the bricks as well.
If just laminate I’d prob fill in the holes and put 3 coats of ardex MVS / fball F78 moisture suppressant
Or if money is ok go F77 all over. 14kg.
Or use a good vapour...
LVT is great. Not soft at all. Been fitting it nearly 40 years. Have it in my house. Looks real if you go with the right one.
Large tiles look at , floorify & kahrs.
Yes then another coat on top.
Best to use the same as underneath but you can use a different one if it’s a similar compression strength
So a system we use a lot
Ardex na / Bostik C955
F77 Dpm
Ardex P4 primer
Ardex CL
That looks like asphalt to me which is good.
Need to get it clean 1st. Best use de greasing crystals from Screwfix.
Then fit in holes with ardex na / fball 1200 pro / Bostik c955 advanced /
Then a liquid Dpm over them sections and any cracks
It’s sloppy and loads of fitters do it that way as it’s quicker. But it leads to heel & toe wear. It’s probably not grippers correctly and that’s why it’s loose as well.