Damp Proofing

Can we put a damp proof membrane under concrete floor but above the damp proof course?

Anonymous user 23/02/2024 - 2.46 PM

Hi, we have a cracked and uneven concrete floor in the kitchen, we have just removed the old units and the flooring which was vinyl tiles on a 1 inch thick black pad to reveal a cracked floor that is uneven and loose. It is higher than the dpc and has no dpm, it's 2-3 inches in places and 5 inches in others and on a bed of an ash type base, the house was built in the 1930's. Can we put a dpm under the concrete but above the dpc or would this cause damp up the walls? We would like to flag the floor with sandstone flag, could we put a dpm down then sand and then lay the flags on this, without taking the concrete up or would this cause damp up the walls too?