Laying new vinyl over old vinyl???

[Scarletpimpofnel]

My house is old and has wooden floorboards throughout except in the kitchen where it is a concrete floor. This concrete floor has a tiny amount of rising damp which causes issues as follows:

1 - Any vinyl laid down develops discolouring due to the damp (the odd yellowing patch or even a very small amount of black mould in the odd spot. This gets trapped beneath the top impervious layer of the vinyl which is water proof and can't be cleaned off as it is underneath the top layer.
2 - Where it has tiles laid on it the grout can develop a small amount of black mould.

The whole area is currently vinyl (5 years old), I know that if I replace it I will just get the same yellowing/mould in the same places again. So my genius (aka bodge) solution is to simply have new vinyl laid on top of the old. The benefit being that the discolouration will stay trapped under the old vinyl and won't be able to penetrate the new. I don't want the cost/expense of taking the ancient concrete floor up and putting a DPC down and the damp problem is very minor, it takes a few years for any discolouration to start working through.

Any thoughts or better ideas? Many thanks.

[OutInTheShed]

Would it be possible to seal the surface of the concrete with something like epoxy paint?

Then maybe an underlay before the vinyl.

You might usefully ask a commercial flooring firm, a different type of vinyl might help.

Or you might tile it and use some serious waterproof grout?

[JoshSm]

Slapping some tanking slurry/whatever or even just SBR onto it might be enough? Vinyl over vinyl isn't going to seal it - if it didnt work for the original layer the new one on top will go the same way too.

Only thing I'm ever wary about with damp is displacing it by sealing one spot up & not actually fixing it, it'll just take another route & cause a slightly different problem elsewhere?