What is this?

[High Peak Tiling]

This on the under side everywhere (fibre mesh/matt)... It's just floating really..

 

[High Peak Tiling]

We used to damp-proof all ground floor floors like that before screeding, the roofing guys used to do it, boiled tar and a mop all over the oversight then we used to screed, if you break through it make sure you re-damproof or you will get damp.......

It is just floating there, it's got to come up as it's not bonded onto the screed.
How would you damp proof this?

 

[Diamond Pool Finishers]

yes take it out then make-up with self-leveller . i would have a look under the screed in at least one place to make sure it has a dpm , if not you are going to have to take the screed up and put one in then just re-screed in place of leveller......

 

[Dougs Third Go]

my house had it, I took it up as it was blown and cracked, put a damp test meter on the concrete and all was fine so I just tiled over the concrete, that was 6 years ago and still all okay.

 

[High Peak Tiling]

yes take it out then make-up with self-leveller . i would have a look under the screed in at least one place to make sure it has a dpm , if not you are going to have to take the screed up and put one in then just re-screed in place of leveller......

Spoken to specification manager at Cemex.
Prime 2 different coats like anhydrite too seal it.
Was their advice.

 

[Andy Allen]

is it an x council house..?? a lot of local authority houses used that kind of flooring..

think its called mastic asphalt..

 

[AliGage]

It has been known to be used as a leveller too to my knowledge.

Remove all.
Repair any deep holes where it looks like walls have been removed.
Prime and SLC the whole area with a reinforced compound abd Ditra the area before fixing.

That would probably be my approach.

 

[Rookery]

is it an x council house..?? a lot of local authority houses used that kind of flooring..

think its called mastic asphalt..

I'd say it was that too. Quite common on social housing at one time.

 

[AliGage]

Yup. Ex DSS new builds was marleys for your floor covering. Which you usually find over bitumen bed or screed. You didnt get the luxuary of carpet!