Rising damp coming through chipboard on concrete floor

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Heres a general view outside

 

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here

 

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Here's the only dpc I can see

 

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Heres the steps I cut away

 

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and the drain at that point

 

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Upper region steps

 

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Heres a sketch of where this all relates to the damp.

 

[Adsy83]

Yup. Looking at all of that.... You need some kind of slot drainage around the edge.

Water is entering down the edge of the building and thru the render. It can't escape anywhere because the render is trapping it. And it's causing your damage.

Could be broken drains but I'd say it'd unlikely.

Also I see dark marks on your walls. Could your gutters be leaking? Which will end with more water entering.

 

[nags]

Adsy83, Not sure I get your meaning

 

[Adsy83]

Adsy83, Not sure I get your meaning

 

[Adsy83]

You need some kind of French drain to stop water entering thru the wall. But the more I think about it I think your guttering is leaking...

 

[nags]

Guttering?
You realise that the extension is single story, with a patio above, draining through through the nearest downpipe in gerneral view.

 

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Were in Kendal, we get a lot of rain, I dont think the black marks on outside walls mean a lot.

 

[nags]

Adsy, I see your slot drain example.
You think it's surface water causing the problem?
What about the moisture in the ground under the paving that's above floor level, and right up against the wall?
Can you tell from that picture of the visible dpc how its supposed to be along the side of the building?

 

[Adsy83]

Just popping out so will look better later.. But that dpc is useless when you have soil that high against the wall. Which is why you need to decrease ground level which isn't exactly easy for you... Or improve. Drainage to stop the water even getting there in the first place. If this was an old old house I'd say lime plaster to aid evaporation....