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apc in reply to @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)

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NotThamesWater in reply to @apc

You can test if it is lime by dropping it in acetic acid / vinegar / other acid - lime fizzes, cement does nothing. It also makes a different sound that cement when you hit it with a trowel.

Can you post more photos of the lower walls?

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apc in reply to @NotThamesWater

Will give it a go with vinegar.

Current hypothesis- water drawn up between layers of render as it’s touching ground. Can’t escape through cement render, goes inside instead. We have v.mild damp at base of this wall.

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