Do I have a DPM?

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23 Jul 2020
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Hello,

I’m planing and laying click flooring on our ground floor. I intend to screed to get a good level using NA.

Most of the ground floor are marley tiles. I’m planning on either screeding over the tiles or remove, depending on how easy they come up. ( I’m aware of the asbestos issues and correct method of removal).

My concern is whether the marley tiles act as a damp proof membrane or not.

My property was built in 1965, my suspicion that the marley tiles are not the DPM is due to the fact there are no marley tiles underneath the kitchen cabinets (just concrete) and none under the existing floor in the downstairs toilet and bathroom.

I have also lifted the lino flooring in the dinning room. One or two of the tiles have popped so I removed these and some of the concrete was cracked so I decided to break of bit off. I found what looks and feels like polythene (image attached). There was no smell or sign of moisture. From the outside of the property I can to the black DPC. At the moment I feel pretty confident there is a DPM underneath the concrete, I just want to ask what people think and that the evidence i'm seeing should be enough to confirm a DPM and the bitumen marley tiles are not.

I've also attached an image on how I believe the polythene DMP is constructed to help get a better idea.
 

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Same issue here so watching this! Built in 1961, marley tiles on bitumen adhesive in most of house. Places where there aren't tiles seem nice and dry.
 

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