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Thanks @Airhead I will make sure to fix any gaps in the render and check all the nearby pipes before I put the Humiblock plaster. Any paint you would recommend to finish the interior?
frankohara-
I think there's a matching paint. It's from Toupret, Humi-block, missed the hyphen first time. Then I painted it with a dulux diamond emulsion because it was a corner in a kitchen and that paint is good for hallways and kitchens. If you have a more matt paint you might need to use something like Gardz to stop it flashing.
Airhead
I tried to solve that sort of problem for many years and ended up cutting the plaster back to brick and using Humiblock plaster. I'm not sure where it goes now but I can't see it anymore.
Had another one at the front of the house which was caused by a soakaway that was full of silt.
I've heard of damp proof experts but it's one area of the building trade that everyone seems to disagree over.