C
cammy0102
It will establish what is screed and what is concrete. If it goes straight through to DPM then you will know:- The whole floor needs redoing and existing will break out easy.
If it penetrates 2" and then buckles you have a 2" screed topping an acceptable concrete oversite. and replacing screed under broken tiles may be limit of works.
Sorry for my ignorance. Is the DPM under the concrete then? Is it DPM, Concrete and screte from bottom to top?