Floor membrane replacement

[darkmarauder]

I live in a 1920s mid terrace and have recently had confirmed that the under floor (under concrete) membrane has failed. This was due to a previous water ingress issue that has now been resolved.
The quotes to have this professionally done whilst reasonable for the time to be taken/materials etc I just can't afford.

So, comments or experience of anyone having carried this out themselves? Professionals opinions?

 

[noseall]

What exactly do you mean by "failed"?

Whilst not ideal, there are many properties that exist without dpm under their floor slab.

Do you have sulphate attack or radon gas issues?

A typical floor replacement would involve digging up existing concrete and material to a depth of say 350-400mm.

100mm troweled concrete (or 75mm screed on 100mm tamped concrete).

80mm celotex or 125mm jablite insulation with a layer of polythene across or foil tape to celotex joints.

1200g polythene dpm.

25-50mm compacted sand blinding.

100mm minimum compacted mot.

 

[^woody^]

As nose asks really, the actual cause needs to be known before a solution is determined.

However, if it's just a case of dampness in the floor slab, then put ' liquid DPM ' into Google and enjoy.

It may well be that a 10kg tub of Ball Stopgap F75 sorts you out for about £130

Also check your insurance policy as the cause of the damp may be something you are covered for

 

[darkmarauder]

By failed I mean that there is rising damp coming through the floor, and various building companies have confirmed this is due to the membrane failing.
For further note, as my house in on a hill the back of my house ground floor is subterranian so due to other damp issues was tanked and damp coursed about two years ago but the remaining water under the house caused the current issue.

The two options I was given was either to have the floor dug up as you discussed or to essentially refinish and seal the current floor.

Comments?

 

[themiddleagedun]

Unless the floor's been re-layed it won't have a membrane...

It sounds like the back of the house being partly underground may be a more likely problem?