Damp concrete floor

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Hi i have an outbuilding that has a damp concrete floor, i know that my builder put dpm underneath the concrete but i think that something has gone wrong and i have told my builder to go due to some problems we have had. I have heard that he was supposed to do finishing on the surface but he has not. Can i just put surface dpm on the surface then put self leveling compound on top of that will that solve the dampness and is that the right way round.
 
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Could be residual moisture in concrete or just a poor DPC. Are the walls damp too. The danger of laying a DPM to the floor is that you will push the moisture into the walls. If the moisture is coming in from the walls then if you lay a DPM the moisture will still get to the flooring.
 
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The walls are not damp. i wanted to put liquid dpm on the floor not dpm the sheet. Do you think it would be ok. My walls have dpc and i have painted the internal bottom layer of engineering bricks with bitumen paint its about three bricks of engineering bricks high all around the building.
 
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If the walls are OK then carry on and put a liquid DPM down. Make sure the floor is clean and dust free, apply the DPM (Iwould suggest a two coat application such as F Ball F75.) Allow it to cure and then apply a neoprene primer, P131 applied neat. Then apply the smoothing underlayment. Should be OK.
 
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