I've had a laminate foor laid in a 1960 built bungalow in the UK. It's buckled!. 1965 building regs required a DPM to be laid under any concrete flooring, I presume this place hasn't a DPM. The CC company have agreed to refund me, but what can I put in its place? The substrate measures 90%RH. If anything's put down, would it push the moisture into the walls, causing damp? When I bought the place, it had good quality carpet on the floor, without any sign of damp. Would carpet be the best bet, with an underlay that would allow it to 'breathe'?.
I would get a damp survey done. Could be a bad drain and or guttering. Best to make sure theres not more of a problem than just rising damp
Drop test done, proving there's no underfloor water leak. All new guttering, bargeboards and soffits and there's no drips coming from the ceiling. It's a well known problem here in the UK, that pre 1965 properties didn't have a DPM under the concrete floor and any wood-based flooring shouldn't be laid before a humidity check's done. The standard seems to be 75%RH - mine measures 90%RH!