hi all
can anyone tell me when it became common practice to use damp proof membrane under concrete floors?
the reason is i am laying a laminate floor at a house built in 1994 and to my supprise it has ashfalt layed on top of the floor-i wonder if this was done "extra" to the sub floor dpm or instead of the sub floor dpm-surely all houses by 1994 had dpm under the concrete!
can anyone tell me when it became common practice to use damp proof membrane under concrete floors?
the reason is i am laying a laminate floor at a house built in 1994 and to my supprise it has ashfalt layed on top of the floor-i wonder if this was done "extra" to the sub floor dpm or instead of the sub floor dpm-surely all houses by 1994 had dpm under the concrete!