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What sort of walls are they - Cavity or solid?
The slate suggests solid, with a slate DPC (I'm very far from an expert though - I'm not aware of slate parging being a thing either), and a lime render, which has then been covered in a cement render.
This means that the lime render now acts as a wick for ground water, which helpfully also breaches the DPC.
Safest bet? Go back to brick and start again. Any render needs to stop above the DPC, and it's probably worth putting in a French drain along the wall to reduce ground water and splash back.
If it's solid wall, take that gypsum to the tip and use lime-based plaster / mortar / render.
Getting an expert in
What sort provenance does the expert have?
Holes are from previous owner injecting dpc
They may have buried dead kittens and puppies too, in that case.
NotThamesWater-
They are solid walls, the gypsum is from a separate job and needs to go to the tip.
Ah so the under render looks like lime? Can I therefore leave the lime touching ground level and just remove the cement? Maybe all the cement.
Unsure on what expert yet but not doing it myself.
I couldn’t find anything about slate parginv either so a bit of a mystery.. next door also have it too (different style of building too)
apc
Can anyone explain what is going on here, bottom of house render, been advised to remove bottom 6inches so that it’s not touching ground level. Getting an expert in but want to know what needs doing.
Appears to be multiple layers of render, one with slate between it?? Appears there is another layer of render behind the slate.
Holes are from previous owner injecting dpc