I live in a house which was build around 1950. We have just taken up some laminate flooring from the entire ground floor which had been put down prior to us moving in and we have discovered that the concrete floor underneath is damp and parts have crumbled away leaving quite large holes.
We have been advised that this is down to a failing or non-existant DPM under the floor and that the best way to treat this (without taking up the entire floor) is to re-fill the holes, paint the floor with a bitumen paint and then finish it off with a self-levelling compound.
I could really use some advise on whether:-
A) this will hold back any damp (we are planning to carpet the floor), and,
B) do we need to apply a primer before applying the bitumous paint?
C) If a primer is required can this be in the form of a PVA mix?
Many thanks in advance for any advise!