DPM on top of the plinth? Garden office.

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Right, here we go..

I have a detached garage built in the sixties with a substantial plinth. The garage is now gone allowing me to have a good look at the plinth. It's square and has a depth of over 150mm. It's downside is that there's no DPM.

The plan is to build a garden office on top of the the plinth.

The BIG question is;
Is it ok to stick a DPM over the top of the concrete plinth and build my timber frame office on top of it? I assume there are some additional problems that come into play such as trying to fix the office to the plinth penetrating the dpm?

I'm going to pre-empt people suggesting other ways of creating a suspended floor over the plinth (ground screws/piles), but I'd rather retain the height and come off the plinth. Perhaps using a Premium DPM and also using DPC under timber for the sake of 'belts and braces'. Where does this idea fall down? Does it fall down? Let me know ;)

..Something I've just thought about. Would it be worth applying an epoxy DPMS? Has anyone any experience with it?
 
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I assume this is a slab foundation?

Issue you could see is moisture coming in underneath. But yea, need to see pictures.
 

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