What is this?

[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!