Its probably hard to get a good vac connection with the wand on that cupped floorWhy not wand it? If its glued down it shouldnt matter if theres gaps.
What caused this damage ?
Are they actually click-locks (like mikey said) or one of the many LVP planks that use either a glue down or pressure sensitive adhesive?
I'd expect even a midwit like Mike would know if clickloc or not...
my best "guess" is cold material that spent a high desert winter night or three in the van and pulled right from the van to the floor.
and/or possibly a cold weather install before the HVAC was operable/running in a rush to complete a rehab
(been there/done that..."once" )
Installed over uncured concrete is possible too, but think that less likely
..L.T.A.
Maybe. Where are the water pipes?
40 plusHow old is the slab/building?