Hi
When I pulled up the living room carpet, it was extremely musty and a bit damp beneath, and I found the remnants of what looks like some form of old DPC layer between the solid concrete floor and the underlay - it was black, bitumeny, very old and disitegrating; looks a bit like thin roofing felt.
Any suggestions for treating said floor? I know there's certainly no DPC membrane below it, as I once had to dig a hole for installation of water/electricity supply (and digging up and replacing the whole ground floor is *not* an option!!). What would the roofing-felt-like layer have been? Worth trying to replace it? Or should I try painting the floor with bitumen-based paint? Or something else?
Thanks David