dpm under concrete floor

21 Sep 2005
Reaction score
United Kingdom
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!
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we've always used a dpm since i joined the trade (1981).

though, back then it was 1000 gauge as opposed to 1200 gauge today.

its either ahfalt or bituman!
its the black stuff :D
i cant understand why a house built in 94 would have this?
I was just going to lay the laminate and underlay straight on top of the ashfalt/bitumin but im wondering if it possible that no damp proof was put under the concrete?
were there any marley floor tiles fitted originally?

it is highly likely you WILL have a dpm. ;)
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thanks for your replies noseall :D

im not sure about the tiles,i will ask the guy when i get back there-i thought it would have the dpm,just had to check!
It originally was the show house to the estate it sits on so they have made a special effort for that one :idea:

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