Hi Guys, first post.
I put down a dpm membrane in a steel shed then poured 2in of concrete, i left it to sit for a week and everything was fine.
i then drilled some small (7mm bit) holes near the corner and now i have damp around the corner.
any way i can fix this.
thanks in advanced.

Remove screws and drill out plugs. Fill with silicone and re plug and screw. Not sure how the silicone will cure if it's damp though, you may want to research some damp proofing cream products to use instead of silicone.

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That's if you are certain that the damp is coming up and not sideways or down...

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yes Barry Convex my thoughts are similar
the structure directing condensation off the roof to these areas

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Geocel "The works" will cure wet; it's a polymer hybrid silicone or summat like that. It'll even cure underwater. Mind you at about a tenner a tube...

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The base wont last very long at 2 inches thick, plus you will suffer from condensation with a metal shed.

thanks guys.
the shed has felt on the back of the steel panels and has 2in of insulation with vapour barrier both sides on the ceiling and in the walls.
it is tapped and has 9mm ply over the top of it.
the 2in base is a sub base poured over a existing slab.
will try to get some pics up in the next few days.
Cheers for the suggestions.