hi i've noticed patches of damp on my living room floor.
i dont think a damp proof membrane sheet has been laid under the concrete floor.
i was wondering if i can use LIQUID damp proof membrane from wickes and paint that on the (screed) floor, will this cure my damp problems? as i dont really want to dig the old conrete out as its all level and its a lot of work.
or will i have to dig the old conrete out and put a water proof membrane sheet and re-conrete it.