It might seem a bit unusual.
Damp proof membrane in concrete floor.
Either a damp proof coating can be applied to the surface of the concrete or a damp proof membrane can be laid on top of the concrete.
Damp proof membranes for concrete i know we re repeating ourselves but a damp proof membraneis one of the most fundamental methods of sealing a damp floor.
You are essentially painting a concrete floor after all.
The epoxy dpm comes as a two component system.
Essentially this is a plastic mesh sheet specially formulated to ensure that moisture cannot penetrate.
This barrier is intended to stop moisture passing from one to the other.
But it is an effective way to do it.
Typically a dpm is a polyethylene sheet laid under a concrete slab to prevent the concrete from gaining moisture through capillary action.
Assuming that the damp proof membrane dpm under the concrete has failed in areas then yes you possibly would get the odd patch of dampness showing in the floor.
If there was no dpm i would suggest a uniformal distribution across the whole floor.
Once the liquid membrane has been applied to the concrete and it dries an extremely hard surface is created that is impenetrable for damp.
A damp proof membrane dpm is a membrane material applied to prevent moisture transmission.
Most damp proof floor coatings are applied directly to the concrete floor surface using a brush or roller.
You also mentioned that there are vinyl tiles over the floor.
Inserted in between the hard core and concrete floor this impermeable layer will prevent rising damp.
It sits between the concrete and the underlay floor covering.
A liquid applied dpm damp proof membrane is a simple solution and an excellent way to damp proof a concrete floor.
If in budget you should look at getting a new concrete floor poured.
A liquid epoxy damp proof membrane dpm is often used as a remedial solution where an existing dpm has failed or was never installed.
The easiest solution for damp proofing concrete floors is to install a plastic membrane.